Artist's conception of the solar system, often used in the Eyes on the Solar System 3D Simulator. Credit: NASA
Venus and Mars may be all right tonight, but there’s still a lot we don’t understand about these planets. Why does one, Venus, have such a thick atmosphere? Why is that of Mars so thin? And why is Earth’s atmosphere so different again from what we see on Venus and Mars?
A new JAXA (Japan Aerospace Exploration Agency) satellite aims to better understand what’s going on. It’s called SPRINT-A, for Spectroscopic Planet Observatory for Recognition of Interaction of Atmosphere.
JAXA has set an official launch date of Aug. 22 from the Uchinoura Space Center, although the window extends as far as Sept. 30. (Launches can be delayed due to weather and mechanical difficulties.) The satellite’s expected Earth orbit will range from 590 to 715 miles (950 to 1150 kilometers) above the planet.
“Venus and Earth may be called twin planets, and it recently becomes clear that three terrestrial planets in the solar system – including Mars – have very similar environments in the beginning era of the solar system,” JAXA stated in a press release.
Earth’s atmosphere was similar to that of Venus and Mars in the early solar system, but now it’s quite different, says JAXA. (Image: NASA/Suomi NPP)
The agency pointed out, however, that these three planets ended up with different fates. Venus has a runaway greenhouse effect on its planet, with surface temperatures reaching a scorching 752 degrees Fahrenheit (400 degrees Celsius). Mars, on the other hand, has a very thin atmosphere and more variable temperatures that can get a little chilly.
Understanding how atmospheres escape into outer space is the main goal of SPRINT-A. The sun, the scientists stated, had more intense activity in the past than what we see presently, which could have blown away the atmosphere on some terrestrial planets.
“The study on interaction of the strong solar wind on the atmosphere of the planet leads to acquiring knowledge of history in the early stage of the solar system,” JAXA stated.
Besides looking at the inner solar system, SPRINT-A will investigate a phenomenon related to a splotchy volcanic moon orbiting the planet Jupiter.
Io, a moon of Jupiter. The colors in this image have been enhanced to better show differences. Sulfur dioxide frost appears in white and grey, and other types of sulfur are in yellow and brown. Recent volcanic activity is marked by red and black blotches. Credit: NASA
SPRINT-A aims to better understand a ring of material surrounding Jupiter that came from Io.
Electrons and ions from the volcanic moon surround Jupiter and, as they collide, produce ultraviolet light in a process similar to what causes auroras in the upper atmosphere of Earth and other planets. How this happens is still being figured out, though.
It’s a pretty radiation-heavy environment in that region of the solar system. The spacecraft Galileo safely orbited the Jovian moons for years, but humans would have a little more trouble surviving the radiation without heavy shielding and careful precautions.
This time lapse mosaic shows Curiosity moving her robotic arm to drill into her 2nd rockt target named “Cumberland” to collect powdery material on May 19, 2013 (Sol 279) for analysis by her onboard chemistry labs; SAM & Chemin. The photomosaic was stitched from raw images captured by the navcam cameras on May 14 & May 19 (Sols 274 & 279). Credit: NASA/JPL-Caltech/Ken Kremer/Marco Di Lorenzo
NASA’s Curiosity rover has just successfully bored inside ancient rocks on Mars for only the 2nd time since her nail biting landing in August 2012 inside Gale Crater as she searches for the ingredients of life.
On Sunday, May 20, the rover drilled about 2.6 inches (6.6 centimeters) deep into a target named “Cumberland” to collect powdery samples from the rock’s interior that hold the secrets to the history of water and habitability on the Red Planet.
“Cumberland” is literally just a stone’s throw away from the first drill target named “John Klein” where Curiosity bored the historic first drill hole on an alien world three months ago in February.
NASA’s Mars rover Curiosity drilled into this rock target, “Cumberland,” during the 279th Martian day, or sol, of the rover’s work on Mars (May 19, 2013) and collected a powdered sample of material from the rock’s interior. Analysis of the Cumberland sample using laboratory instruments inside Curiosity will check results from “John Klein,” the first rock on Mars from which a sample was ever collected and analyzed. The two rocks have similar appearance and lie about nine feet (2.75 meters) apart. Image Credit: NASA/JPL-Caltech/MSSS
Analysis of the gray colored, powdery “John Klein” sample by Curiosity’s pair of onboard chemistry labs – SAM & Chemin – revealed that this location on Mars was habitable in the past and possesses the key chemical ingredients required to support microbial life forms – thereby successfully accomplishing the key science objective of the mission and making a historic discovery.
The Cumberland powder will be fed into SAM and Chemin shortly through a trio of inlet ports on the rover deck.
‘Cumberland’ lies about nine feet (2.75 meters) west of ‘John Klein’. Both targets are inside the shallow depression named ‘Yellowknife Bay’ where Curiosity has been exploring since late 2012.
The six wheeled NASA robot arrived at Cumberland just last week on May 14 (Sol 274) after a pair of short drives.
6 Wheels on Mars at “Cumberland” drill target is shown in this photo mosaic of Curiosity’s underbelly snapped on May 15, 2013 (Sol 275) after the rover drove about 9 feet (2.75 m) from the John Klein outcrop inside Yellowknife Bay. Credit: NASA/JPL-Caltech/Ken Kremer/Marco Di Lorenzo
The science team directed Curiosity to drill into ‘Cumberland’ to determine if it possesses the same ingredients found at “John Klein” and whether the habitable environment here is widespread and how long it existed in Mars’ history.
“We’ll drill another hole [at Cumberland] to confirm what we found in the John Klein hole,” said John Grotzinger to Universe Today. Grotzinger, of the California Institute of Technology in Pasadena, Calif., leads NASA’s Curiosity Mars Science Laboratory mission.
“The favorable conditions included the key elemental ingredients for life, an energy gradient that could be exploited by microbes, and water that was not harshly acidic or briny,” NASA said in a statement.
Panoramic view of Yellowknife Bay basin back dropped by Mount Sharp shows the location of the first two drill sites – John Klein & Cumberland – targeted by NASA’s Curiosity Mars rover. Curiosity accomplished historic 1st drilling into Martian rock at John Klein outcrop on Feb 8, 2013 (Sol 182) near where the robotic arm is touching the surface. This week the rover scooted about 9 feet to the right to Cumberland (right of center) for 2nd drill campaign on May 19, 2013 (Sol 279). Credit: NASA/JPL-Caltech/Ken Kremer/Marco Di Lorenzo
‘Cumberland’ and ‘John Klein’ are patches of flat-lying bedrock shot through with pale colored hydrated mineral veins composed of calcium sulfate and featuring a bumpy surface texture inside the ‘Yellowknife Bay’ basin that resembles a dried out lake bed.
“We have found a habitable environment [at John Klein] which is so benign and supportive of life that probably if this water was around, and you had been on the planet, you would have been able to drink it,” said Grotzinger.
Curiosity will remain at Cumberland for several weeks to fully characterize the area and then continue exploring several additional outcrops in and around Yellowknife Bay.
“After that we’re likely to begin the trek to Mt. Sharp, though we’ll stop quickly to look at a few outcrops that we passed by on the way into Yellowknife Bay,” Grotzinger told me.
One stop is likely to include the ‘Shaler’ outcrop of cross-bedding that was briefly inspected on the way in.
Thereafter the 1 ton rover will resume her epic trek to the lower reaches of mysterious Mount Sharp, the 3.5 mile (5.5 km) high layered mountain that dominates her landing site and is the ultimate driving goal inside Gale Crater.
And don’t forget to “Send Your Name to Mars” aboard NASA’s MAVEN orbiter- details here. Deadline: July 1, 2013
Video Caption: This JPL video shows the complicated choreography to get drill samples to Curiosity’s science instruments after completing 2nd drill campaign at “Cumberland.”
Cottonwood trees and the Milky Way on May 12, 2013. Credit and copyright: Randy Halverson/Dakotalapse.
Admittedly, I’m partial to Randy Halverson’s night sky photography from South Dakota. Having grown up in neighboring North Dakota myself, Halverson’s images bring back memories of the dark skies that grace the northern plains. But this one is just stunning, not to mention my early childhood home was surrounded by cottonwood trees — towering giants with ample limbs, and one of the few trees that grew well in the harsh prairies of the Dakotas.
Randy said he was trying out some new gear with this image, which is a frame from a timelapse he is shooting (can’t wait!) He used ased a Canon 6D and a Rokinon 24mm F1.4 lens (set at F2), using Emotimo TB3 Black timelapse equipment, shot at ISO 3200 for 20 seconds.
Want to get your astrophoto featured on Universe Today? Join our Flickr group or send us your images by email (this means you’re giving us permission to post them). Please explain what’s in the picture, when you took it, the equipment you used, etc.
This article originally appeared in 2009, but I’ve updated it and added this video.
The ground feels firm and solid beneath your feet. Of course, the Earth is rotating, turning once on its axis every day. Fortunately gravity keeps you firmly attached to the planet, and because of momentum, you don’t feel the movement – the same way you don’t feel the speed of a car going down the highway. But how fast does the Earth rotate?
You might be surprised to know that a spot on the surface of the Earth is moving at 1675 km/h or 465 meters/second. That’s 1,040 miles/hour. Just think, for every second, you’re moving almost half a kilometer through space, and you don’t even feel it.
Want to do the calculation for yourself? The Earth’s circumference at the equator is 40,075 km. And the length of time the Earth takes to complete one full turn on its axis is 23.93 hours.
Wait, 23.93 hours? Isn’t a day 24 hours? Astronomers calculate a day in two ways. There’s the amount of time it takes for the Earth to complete one full rotation on its axis, compared to the background stars. Imagine you were looking down at the Earth from above the North Pole. You’d see the Earth turn once completely in 23 hours and 56 minutes. Astronomers call this a sidereal day.
And then there’s the time it takes for the Sun to return to the same spot in the sky. Since the Earth is orbiting the Sun, we actually need an extra 4 minutes each day to return the Sun to the same spot. Astronomers call this a solar day.
Then we divide the length of a day into the distance a point on the equator travels in that period: 40,075 km/23.93 hours = 1,675 km/hour, 465 meters/second.
The speed of the Earth’s rotation changes as you go North or South away from the equator. Finally, when you reach one of the Earth’s poles, you’re taking a whole day to just turn once in place – that’s not very fast.
Because you’re spinning around and around on the Earth, there’s a force that wants to spin you off into space; like when you spin a weight on a string. But don’t worry, that force isn’t very strong, and it’s totally overwhelmed by the force of gravity holding you down. The force that wants to throw you into space is only 0.3% the force of gravity. In other words, if the Earth wasn’t spinning, you would weigh 0.3% more than you do right now.
Space agencies take advantage of the higher velocities at the Earth’s equator to launch their rockets into space. By launching their rockets from the equator, they can use less fuel, or launch more payload with the same amount of fuel. As it launches, the rocket is already going 1,675 km/hour. That makes it easier to reach the 28,000 km/hour orbital velocity; or even faster to reach geosynchronous orbit.
We have written many articles about the Earth for Universe Today. Here’s an article about why the Earth rotates.
A menagarie of animals launched to space last month has arrived back on Earth — with a few casualties for the voyage.
Bion-M, a small satellite carrying gerbils, lizards, mice and other critters, launched in April from the Plesetsk Cosmodrome in Russia and arrived, as planned, safely on Earth on Sunday (May 19).
However, not all of the assorted crew survived the voyage.
“This is the first time that animals have been put in space on their own for so long,” said Vladimir Sychov of the Russian Academy of Sciences, as reported by several news agencies. Half of the 45 mice were lost in the journey, which was expected, but the eight gerbils unexpectedly died “because of equipment failure”, he added.
The Bion-M hardware is readied for flight. Credit: Russian Federal Space Agency (Roscosmos)
Still, the scientists expect to pull a lot of long-duration data out of the mission. It is expected to help scientists better understand the effects of microgravity on biological organisms, with applications for long human voyages such as a trip to Mars.
Microgravity does a number on human systems, as just-returned-from-space astronaut Chris Hadfield eloquently described recently.
Bones lose calcium, muscles shrink and there are changes to your blood pressure flow and even your eyes. Taking a trip to space is like experiencing aging on fast-forward (although luckily, the effects are mostly reversible.)
Michael Foale on the ISS’s treadmill. Astronauts on station exercise two hours a day, typically, to fight against microgravity’s effects. Credit: NASA
“Knowledge gained in the use of animals reveals the fundamental mechanisms of adaptation to spaceflight,” NASA stated in a web page about the mission. “Such knowledge provides insight for potential long-duration human spaceflight risk mitigation strategies and potential new approaches for Earth bound biomedical problems.”
Before Bion-M journeyed to space, most mouse studies only took place during space shuttle missions that were in orbit for a maximum of two weeks. The new 30-day mission doubled the length of previous studies and also allow more advanced technologies to be brought to bear on the science, stated NASA, who participated in the mission.
“NASA researchers will study the cellular mechanisms responsible for spaceflight-induced changes on tissues and cell growth in mice, including muscle, bone and the cardiovascular and reproductive systems,” the agency wrote in an April press release. “They also will study behavioral effects in gerbils.”
Image from May 5, 2013 of a the inner region of Comet ISON using the 2-meter Liverpool telescope at La Palma. Credit: Nick Howes and Ernesto Guido, Remanzacco Observatory; Nalin Samarasinha, Planetary Science Institute.
In April, when the Hubble Space Telescope looked out towards Jupiter’s orbit and observed what has been billed as the “Comet of the Century” – Comet C/2012 S1 ISON – the space telescope photographed a unique feature in the comet’s coma. Now, a team of ground-based astronomers have performed follow-up observations, imaging Comet ISON as it heads towards the Sun and was just outside the orbit of Mars. They, too, have seen something in the coma and suspect it’s a similar feature to what Hubble imaged. The object is thought to be a jet blasting dust particles off the sunward-facing side of the comet’s nucleus.
These very useful follow-up observations are providing more insight on this highly anticipated comet, as well as helping to predict what might happen when it makes its closest approach to the Sun in November 2013.
“The hype surrounding this comet has been extreme” said Nick Howes from the Remanzacco Observatory, “with some wildly optimistic estimates for magnitude. We’re hoping this measured scientific approach will yield results just as exciting to the science community, even if the comet doesn’t end up meeting everyone’s expectations visually, for whatever reason.”
NASA’s Hubble Space Telescope provides a close-up look of Comet ISON (C/2012 S1), as photographed on April 10, when the comet was slightly closer than Jupiter’s orbit at a distance of 386 million miles from the sun. Credit:NASA, ESA, J.-Y. Li (Planetary Science Institute), and the Hubble Comet ISON Imaging Science Team.
Some have predicted ISON may briefly become brighter than the full Moon. But right now the comet is far below naked-eye visibility, and larger telescopes are needed to makes observations.
Howes and Ernesto Guido from the Remanzacco Observatory in Italy used a suite of Hubble-sized ground-based telescopes in Australia, Hawaii and the Canary Islands to make their observations. They are collaborating with with Nalin Samarasinha, a Senior Scientist at the Planetary Science Institute (PSI) in an attempt to get high spatial resolution data on Comet ISON.
Howes and Guido have been imaging Comet C/2012 S1 ISON since the day it was discovered and actually played a small role in its discovery. They work on a variety of programs with professional and amateur astronomers around the world, but for this comet, their focus is on the so-called Afrho, a measure of a comet’s dust production. (Learn more about Arfho here.)
Samarasinha, a specialist in comets at the Planetary Science Institute, has been looking at the detailed structure of the near-nucleus coma of comet C/2012 S1 ISON using data, which the Remanzacco team is delivering in to the PSI.
Recently, Samarasinha had looked at image comparisons for the Remanzacco team’s dataset from May 2, 5, and 7 taken with the F10 2-meter Liverpool telescope on La Palma, using an extremely sensitive camera, perfectly suited for detailed comet work.
Image from May 2, 2013 of a the inner region of Comet ISON, using the 2 meter Liverpool Telescope at La Palma. Credit: Nick Howes and Ernesto Guido, Remanzacco Observatory; Nalin Samarasinha, Planetary Science Institute.
The images shown here are 28×28 pixel crops of the inner region of the comet.
“This comparison shows that the sunward feature Nick’s team suspected from images taken on 02/05/2013 is originating slightly north of west and then the position angle of the feature (measured from north through east) increases as one moves away from the optocenter,” said Nalin.
Nalin’s interpretation is that the curvature of this feature (which the team suspected was not caused by image enhancing initially, but can now categorically state is real) is not due to any rotational effects but is due to radiation pressure pushing dust grains towards the tail. Ultimately, this feature merges in with the tail. Image from May 7, 2013 of a the inner region of Comet ISON, as seen with the 2-meter Liverpool Telescope at La Palma. Credit: Nick Howes and Ernesto Guido, Remanzacco Observatory; Nalin Samarasinha, Planetary Science Institute.
The team says these observations are in close agreement with features detected by the Hubble Space Telescope in April this year. As the comet comes closer to the Earth the spatial resolution will improve, and the team should get more detailed views on the coma structure.
Estimates suggest that the nucleus of ISON is no larger than 4-6 km (3-4 miles) across while the comet’s dusty coma, or head of the comet is approximately 5,000 km (3,100 miles) across, or 1.2 times the width of Australia. A dust tail extends more than 92,000 km (57,000 miles).
Ongoing observations seem to reveal this comet is ‘shedding’ quite a bit of mass, leaving astronomers to wonder if it will have enough body left to survive its perhihelion, the closest approach to the Sun on November 28, 2013.
Excitingly, Comet ISON observations are in the works for when the comet dashes past Mars, and the Curiosity rover is on tap to try imaging it from Mars’ surface with its high resolution Mastcam 100 camera, as well as on-orbit observations with the Mars Reconnaissance Orbiter (MRO).
As the comet performs a hairpin turn around the Sun in November, its ices will vaporize in the intense solar heat. Assuming it defies death by evaporation, some predict it could become as bright as the full Moon. If so, that would occur for a brief time around at perihelion when the comet would only be visible in the daytime sky very close to the Sun. When safely viewed, ISON might look like a brilliant, fuzzy star in a blue sky.
As C/2012 S1 ISON is now heading in to the evening twilight glare, Howes and Guido will turn from large aperture instrumentation on this comet for a while, and work on observations with a wider field CCD, more sensitive in the R’ band, and also imaging with the Polarimeter instrument which will allow them to create detailed maps of the inner coma region.
Howes said that these ongoing collaborations with scientists with the amateur community are delivering valuable scientific data on a hugely interesting object.
Nighttime image of southern India and Tropical Cyclone Mahasen (NASA/NOAA)
Last Monday, May 13, the Suomi NPP satellite captured a fascinating image of Tropical Cyclone Mahasen as it moved northeast over the Bay of Bengal. The clouds of the storm itself weren’t optically visible in the darkness of a nearly new Moon, but lightning flashes within it were… as well as the eerie ripples of atmospheric gravity waves spreading outwards from its center.
According to the Space Physics Research Group at the University of California, Berkeley:
Gravity waves are the oscillations of air parcels by the lifting force of bouyancy and the restoring force of gravity. These waves propagate vertically as well as horizontally, and actively transport energy and momentum from the troposphere to the middle and upper atmosphere. Gravity waves are caused by a variety of sources, including the passage of wind across terrestrial landforms, interaction at the velocity shear of the polar jet stream and radiation incident from space. They are found to affect atmospheric tides in the middle atmosphere and terrestrial weather in the lower atmosphere. (Source)
Atmospheric gravity waves aren’t to be confused with gravitational waves in space, which are created by very dense, massive objects (like white dwarf stars or black holes) orbiting each other closely.
When the image was captured, Tropical Cyclone Mahasen was moving north through the Indian Ocean along a track that placed landfall along the Bangladesh coast. As it moved off the coast of India Suomi’s VIIRS Day-Night Band was able to resolve lightning flashes towards the center of the storm, along with mesopheric gravity waves emanating outwards like ripples in a pond.
Such gravity waves are of particular interest to air traffic controllers so assist in identifying areas of turbulence.
Since the moon was in a new phase, the lights and other surface features of India and Sri Lanka are clearly visible although the clouds of Mahasen are not — a tradeoff that occurs as the amount of moonlight cycles throughout the month.
TS Mahasen on May 17, 2013 (Chelys/EOSnap)
Over the course of the next few days Mahasen weakened into a deep depression, making landfall as a tropical storm on Bangladesh on May 16. In preparation for the storm large-scale evacuations were recommended for parts of Myanmar; however, this resulted in the overcrowding of boats and several vessels capsized. (Source: eosnap.com)
NASA launched the National Polar-orbiting Operational Environmental Satellite System Preparatory Project (or NPP) on October 28, 2011 from Vandenberg Air Force Base. On Jan. 24, NPP was renamed Suomi National Polar-orbiting Partnership, or Suomi NPP, in honor of the late Verner E. Suomi. It’s the first satellite specifically designed to collect data to improve short-term weather forecasts and increase understanding of long-term climate change.
Suomi NPP orbits Earth about 14 times a day, observing nearly the entire surface of the planet.
British astronaut Timothy Peake training in a Soyuz simulator. (European Space Agency)
The name is Peake. Timothy Peake. And he’s set to follow in the (fictional) footsteps of fellow British citizen James Bond with a stay on a space station.
In 2015, Peake will be the first British citizen to live for six months on the International Space Station. He’ll be a part of the Expedition 46/47 crew. NASA hasn’t publicly named all of his seatmates yet, but expect a lot of excitement across the former Empire when Peake has his turn.
“This is another important mission for Europe and in particular a wonderful opportunity for European science, industry and education to benefit from microgravity research,” Peake said in a statement.
There have been a bevy of British astronauts before Peake, both as joint nationals within NASA and even for private spaceflights (remember Mark Shuttleworth‘s and Richard Garriott’s ‘vacations’ on station?) Also, it’s quite possible that even more British citizens will get into space before Peake does in 2015.
ESA astronaut Timothy Peake trains for the NEEMO 16 underwater mission. Credit: NASA
That’s not due to lack of qualifications on Peake’s part, though. He participated in the NEEMO 16 underwater mission and took part in a periodic underground cave expedition that ESA runs to simulate spaceflight, among other duties. Peake also used to be a helicopter pilot in the British Army; the media is already calling him “Major Tim” for that reason in homage to David Bowie’s “Space Oddity” song (most recently pwned by Canadian astronaut Chris Hadfield.)
But 2015 also marks when the ground is expected to shift, so to speak, in commercial spaceflight. It’s expected that Britain’s Virgin Galactic will start regular suborbital runs around that year. (XCOR’s Lynx suborbital spacecraft also may start flights around the same time, perhaps with British citizens on board.)
British songstress Sarah Brightman previously announced she will make a much shorter visit to the space station in 2015. That hasn’t been fully confirmed yet — there aren’t many seats available on Soyuz spacecraft after the end of the shuttle program — but it’s possible she could make it up there.
Getting back to Peake, some important secondary news came out for the latest corps of European astronauts: all of them are expected to fly before the end of 2017, as ESA previously promised.
The European Space Agency’s astronaut class of 2009 (left to right): Andreas Mogensen, Alexander Gerst, Samantha Cristoforetti, Thomas Pesquet, Luca Parmitano, Timothy Peake. Credit: European Space Agency/S. Corvaja
The astronauts, who call themselves ‘The Shenanigans’, are already having an exciting month as Italian Luca Parmitano is scheduled to fly to the International Space Station May 28. (In a spaceflight first, he’s doing outreach with a 15-year-old while in orbit.)
Two other Shenanigans are assigned to spaceflights: Alexander Gerst and Samantha Cristoforetti, who will make the journey around 2014.
It’ll be a little while before the last two astronauts, Andreas Mogensen and Thomas Pesquet, get confirmation of flight assignments, but it should be by announced by mid-2015, stated ESA’s director-general, Jean-Jacques Dordain.
ESA has made numerous contributions to the station, racking up credits that the federation of countries can use towards astronaut spaceflights. Among them are the Columbus laboratory, the Automated Transfer Vehicle cargo ship and the cupola (a panoramic window with a history of awesome astronaut shots.)
A view from the cupola in the International Space Station. Credit: NASA
“The value of Europe’s astronauts and the training given at the European astronaut center is reflected in the large number of mission assignments awarded to ESA astronauts,” stated Thomas Reiter, ESA’s director of human spaceflight and operations.
You can follow Peake’s training at his Twitter account, and he has promised to keep up his social media efforts in space.
“I certainly will be tweeting from space. A large part of what I want to achieve on this mission is to try to inspire a generation and encourage them to continue to support space flight and microgravity research,” Peake said in a press conference, as reported by The Guardian.
A rural location is ideal for listening to the subtle sounds of the aurora with a VLF radio. Just turn it on and hold it up to the sky.This photo was taken early Saturday morning when green auroras were still visible through breaks in the clouds. Photo: Bob King
Do the aurorae makes sounds? That’s been a subject of discussion — and contention — among people who watch the sky. While most of us will never hear the aurora borealis directly, there’s help out there in the form of a little handheld radio. It’s called a VLF receiver and guarantees you an earful the next time the aurora erupts.
High-speed electrons and protons buzzing along Earth’s magnetic fields lines emit very low frequency radio waves that human ears can here with a VLF receiver. Credit: Bob King
Despite seeing hundreds of northern light displays ranging from mild to wild, I’ve yet to actually hear what some describe as crackles and hissing noises. There is some evidence that electrophonic transduction can convert otherwise very low frequency (VLF) radio waves given off by the aurora into sound waves through nearby conductors. Wire-framed eyeglasses, grass and even hair can act as transducers to convert radio energy into low-frequency electric currents that can vibrate an object into producing sound. Similar ‘fizzing’ sounds have been recorded by meteor watchers that may happen the same way.
Laboratory tests reveal that a surprising variety of substances, including frizzy hair and vegetable matter, can act as radio-to-audio VLF transducers. Credit: NASA
Imagination may be another reason some folks people hear auroras. Things that move often make sounds. A spectacular display of moving lights overhead can trick your brain into serving up an appropriate soundtrack. Given that the aurora is never closer to the ground than 50 miles, the air is far too thin at this altitude to transmit any weak sound waves that might be produced down to your ears.
If you’re like me and hard of auroral hearing, a small VLF (very low frequency) radio receiver will do the job nicely. This handheld device converts very low frequency radio waves produced from the interaction of the solar electrons and protons with the Earth’s magnetic field into sounds you can listen to with a pair of headphones.
The battery-operated WR-3 VLF (Very Low Frequency) receiver with headphones for tuning into sounds “natural” radio broadcast by planet Earth. Credit: Bob King
We’re used to waves of light which are very, very short, measuring in the millionths of an inch long. The pigments in our retinas convert these waves into visible images of the world around us. Radio waves given off by auroras and other forms of natural ‘Earth energy’ like lightning range from 19 to 1,800 miles long or longer. To bring them within range of human hearing we need a radio receiver. I fire up a little unit called a WR-3 I purchased back in the mid-1990s. The components are housed in a small metal box with a whip antenna and powered by a 9-volt battery. The on-off switch also controls the volume. Plug in a set of headphones and you’re ready to listen. That’s all there is to it.
The magnetosphere of the Earth is enormous bubble of magnetism that surrounds our planet. It’s created through the interaction of the solar wind (yellow lines) and Earth’s magnetic field. The magnetosphere acts as a shield to protect us from dangerous radiation in space. Earth’s magnetic field lines are shown in concentric purple ovals, pushed on by pressure from the Sun and elongated on the side facing sway from the Sun. Credit: NASA
The receiver picks up lots of things besides aurora including a big ‘unnatural’ hum from alternating or AC current in power lines and home appliances. Turn one on in your house and you’ll immediately hear a loud, continuous buzz in the headphones. You’ll need to be at least a quarter mile from any of those sources in order to hear the more subtle music of the planet.
Lightning produces a great variety of natural radio sounds – sferics, tweeks and whistlers – you can hear with a VLF radio receiver. Credit: Bob King
I drive out to a open ‘radio quiet’ rural area, turn on the switch and raise the antenna to the sky. Don’t stand under any trees either. They’re great absorbers of the low frequency radio energy you’re trying to detect. What will you hear? Read on and click the links to hear the sound files.
* Sferics. The first thing will be the pops, crackles and sizzles of distant lightning called sferics which are similar to the crackles on an AM car radio during a thunderstorm.
* Tweeks. Lightning gives off lots of energy in the long end of the radio spectrum. When that energy gets ducted through the upper layers of Earth’s atmosphere called the ionosphere over distances of several thousand miles, it emits another type of sound called ‘tweeks‘. These remind me of Star Wars lasers or dripping water. Flurries of tweeks have an almost musical quality like someone plucking the strings of a piano.
* Whistlersand Whistler Clusters. When those same lightning radio waves enter Earth’s magnetosphere and interact with the particles there, they can cycle back and forth between the north and south geomagnetic poles traveling tens of thousands of miles to create whistlers. Talk about an eerie, futuristic sound. After their long journey, the higher frequency waves arrive before those of lower frequency causing the sound to spread out in a series of long, descending tones. The sound may also take you back to those old World War II movies when bombs whistled through the air after dropping from the hatch of a B-17. Tweeks are very brief; whistlers last anywhere from 1/2 to 4 seconds or longer.
* Dawn Chorus. Sometimes you’ll hear dozens of whistlers, one after the other. When conditions are right, a VLF receiver can pick up disturbances in Earth’s magnetic bubble spawned by auroras called ‘chorus‘ or ‘dawn chorus’. Talk about strange. Who would have guessed that solar electrons spiraling along Earth’s magnetic field lines would intone the ardor of frogs or a chorus of birds at dawn? And yet, there you have it.
* More Dawn Chorus: On a good night, and especially when the northern lights are out, it’s a magnetospheric symphony. Thunderstorms thousands of miles away provide a bounty of crackles and tweeks with occasional whistlers. Listen closely and you might even hear the froggy voice of the aurora rising and falling with a rhythm reminiscent of breathing.
The crescent moon, Jupiter and Venus accompanied a spectacular aurora over Lake Superior in Duluth, Minn. last July. With solar activity on the upswing and solar maximum predicted for the fall, auroras are more likely than ever in 2013. Credit: Bob King
If you’re interested in listening to VLF and in particular the aurora, basic receivers are available through the two online sites below. I’ve only used the WR-3 and can’t speak for the others, but they all run between $110-135. One word of warning if you purchase – don’t use one when there’s a lightning storm nearby. Holding a metal aerial under a thundercloud is not recommended!
More on natural radio can be found HERE. Things to keep in mind when considering a purchase are whether you have access to an open area 1/2 mile from a power line and away from homes. You’ll also need patience. Many nights you’ll only hear lightning crackles from distant storms thousands of miles away peppered by the occasional ping of a tweet. Whistlers may not appear for weeks at a time and then one night, you’ll hear them by the hundreds. But if you regularly watch the sky, it’s so easy to take the radio along and ‘give a listen’ for some of the most curious sounds you’ll ever hear. How astonishing it is to sense our planet’s magnetosphere through sound. Consider it one more way to be in touch with the home planet.
For more on natural radio including additional sound files I invite you to check out Stephen P. McGreevy’s site.
Panoramic view of Yellowknife Bay basin back dropped by Mount Sharp shows the location of the first two drill sites - John Klein & Cumberland - targeted by NASA’s Curiosity Mars rover. Curiosity accomplished historic 1st drilling into Martian rock at John Klein outcrop on Feb 8, 2013 (Sol 182) near where the robotic arm is touching the surface. This week the rover scooted about 9 feet to the right to Cumberland (right of center) for 2nd drill campaign in late-May 2013. Credit: NASA/JPL-Caltech/Ken Kremer/Marco Di Lorenzo
Video Caption: This JPL video shows the complicated choreography to get drill samples to Curiosity’s instruments as she prepares for 2nd drilling at “Cumberland.” See where “Cumberland” is located in our panoramic photo mosaic below.
It’s time at last for “Drill, Baby, Drill!” – Martian Style.
Well, check out this enlightening and cool new NASA video for an exquisitely detailed demonstration of just how Curiosity shakes, rattles and rolls on the Red Planet and swallows that mysterious Martian powder.
“Shake, shake, shake… shake that sample. See how I move drilled rock to analytical instruments,” tweeted Curiosity to millions of fans.
Get set to witness Martian gyrations like you’ve never seen before.
After a pair of short but swift moves this past week, NASA’s Curiosity rover is finally in position to bore into the Red Planet’s alien surface for the second time – at a target called “Cumberland.”
See where “Cumberland” is located in our panoramic photo mosaic below.
“Two short drives & 3.8 meters later, I’m zeroing in on my second Mars drilling target,” tweeted Curiosity.
Panoramic view of Yellowknife Bay basin back dropped by Mount Sharp shows the location of the first two drill sites – John Klein & Cumberland – targeted by NASA’s Curiosity Mars rover. Curiosity accomplished historic 1st drilling into Martian rock at John Klein outcrop on Feb 8, 2013 (Sol 182) near where the robotic arm is touching the surface. This week the rover scooted about 9 feet to the right to Cumberland (right of center) for 2nd drill campaign in late-May 2013.
Credit: NASA/JPL-Caltech/Ken Kremer/Marco Di Lorenzo [/caption]
These were Curiosity’s first drives since arriving at the “John Klein” outcrop in mid- January 2013 where she carried out the historic first ever interplanetary drilling by a robot on another world.
For the past few days the robot has snapped a series of close up images of “Cumberland” with the high resolution MAHLI camera on the “hand” of the dextrous robotic arm.
And now that Curiosity has switched to the B-side computer, the rover has switched over to an back up set of never before used cameras on the mast head, which appear to be functioning perfectly.
“Curiosity is now using the new pair of navigation cameras associated with the B-side computer,” said Curiosity science team member Kimberly Lichtenberg to Universe Today.
The rover also evaluated the potential drill site with the ChemCAM and APXS instruments to confirm whether ‘Cumberland’ is indeed a worthy target for the time consuming process to collect the drill tailings for delivery to the duo of miniaturized chemistry labs named SAM and Chemin inside her belly
As outlined in the video, the robot engages in an incredibly complex procedure to collect the drill bit tailings and then move and pulverize them through the chambers of the CHIMRA sample system on the tool turret for processing, filtering and delivery for in situ analysis that could take weeks to complete.
This patch of bedrock, called “Cumberland,” has been selected as the second target for drilling by NASA’s Mars rover Curiosity. The rover has the capability to collect powdered material from inside the target rock and analyze that powder with laboratory instruments. The favored location for drilling into Cumberland is in the lower right portion of the image. Credit: NASA/JPL-Caltech/MSSS
The state-of-the-art SAM and Chemin chemistry labs test aspirin sized quantities of the carefully sieved powder for the presence of organic molecules – the building blocks of life – and determine the inorganic chemical composition.
The science team wants to know how ‘Cumberland’ stacks up compared to ‘John Klein’, inside the shallow depression named ‘Yellowknife Bay’ where Curiosity has been exploring since late 2012.
“We’ll drill another hole to confirm what we found in the John Klein hole,” said John Grotzinger to Universe Today. Grotzinger, of the California Institute of Technology in Pasadena, Calif., leads NASA’s Curiosity Mars Science Laboratory mission.
‘Cumberland’ and ‘John Klein’ are patches of flat-lying bedrock shot through with pale colored hydrated mineral veins composed of calcium sulfate hydrated and a bumpy surface texture at her current location inside the ‘Yellowknife Bay’ basin that resembles a dried out lake bed.
“The bumpiness is due to erosion-resistant nodules within the rock, which have been identified as concretions resulting from the action of mineral-laden water,” according to NASA.
At Yellowknife Bay, Curiosity found evidence for an ancient habitable environment that could possibly have supported simple Martian microbial life forms eons ago when the Red Planet was warmer and wetter.
Analysis of the gray colored rocky Martian powder at ‘John Klein’ revealed that the fine-grained, sedimentary mudstone rock possesses significant amounts of phyllosilicate clay minerals; indicating the flow of nearly neutral liquid water and a habitat friendly to the possible origin of microbes.
Curiosity is expected to drill and swallow the ‘Cumberland’ powder at any moment if all goes well, a team member told Universe Today.
High resolution close-up of Cumberland outcrop on Sol 275 (May 15, 2013) – where Curiosity will bore her 2nd drill hole. Photo mosaic of Mastcam 100 raw images. Credit: NASA/JPL-Caltech/MSSS/Ken Kremer/Marco Di Lorenzo
Meanwhile as Curiosity was moving to Cumberland, her older sister Opportunity was blazing a trail at Endeavour Crater on the opposite side of Mars and breaking the distance driving record for an American space rover. Read all about it in my new story – here.
And don’t forget to “Send Your Name to Mars” aboard NASA’s MAVEN orbiter- details here. Deadline: July 1, 2013
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Learn more about Mars, Curiosity, Opportunity, MAVEN, LADEE and NASA missions at Ken’s upcoming lecture presentations:
June 11: “Send your Name to Mars” and “LADEE Lunar & Antares Rocket Launches from Virginia”; NJ State Museum Planetarium and Amateur Astronomers Association of Princeton (AAAP), Trenton, NJ, 8 PM.
