Look at How Much the Sun Has Changed in Just Two Years

Image of the Sun from Solar Orbiter (left Feb 2021 and right Oct 2023)

The solar cycle has been reasonably well understood since 1843 when Samuel Schwabe spent 17 years observing the variation of sunspots. Since then, we have regularly observed the ebb and flow of the sunspots cycle every 11 years. More recently ESA’s Solar Orbiter has taken regular images of the Sun to track the progress as we head towards the peak of the current solar cycle. Two recently released images from February 2021 and October 2023 show how things are really picking up as we head toward solar maximum.

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NASA's Interstellar Mapping Probe Prepares for a 2025 Launch

IMAP will study the protective magnetic bubble that surrounds our solar system, called the heliosphere, and the particle acceleration that occurs across it. Credits: NASA/Princeton/Johns Hopkins APL/Josh Diaz

Engineers at NASA have completed an important milestone in developing the Interstellar Mapping and Acceleration Probe (IMAP) spacecraft. It’s now moving from development and design to the assembly, testing, and integration phase, targeting a launch in late Spring 2025. After launch, the spacecraft will fly to the Earth-Sun L1 Lagrange Point and analyze how the Sun’s solar wind interacts with charged particles originating from outside the Solar System.

IMAP will follow up on discoveries and insights from the two Voyager spacecraft and the Interstellar Boundary Explorer (IBEX) and will help investigate two of the most important overarching issues in heliophysics: the energization of charged particles from the Sun and the interaction of the solar wind at its boundary with interstellar space.

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We Should Hit Peak Solar Activity Next Year

SDO Sol
NASA SDO's view, of our tempestuous host star. NASA/SDO

You may be familiar with the solar cycle that follows a 22 year process shifting from solar minimum to maximum and back again.  It’s a cycle that has been observed for centuries yet predicting its peak has been somewhat challenging.  The Sun’s current cycle is approaching maximum activity which brings with it higher numbers of sunspots on its surface, more flares and more coronal mass ejections. A team from India now believe they have discovered a new element of the Sun’s magnetic field allowing them to predict the peak will occur early in 2024.

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The Solar Radius Might Be Slightly Smaller Than We Thought

SDO Sol
NASA SDO's view, of our tempestuous host star. NASA/SDO

A pioneering method suggests that the size of our Sun and the solar radius may be due revision.

Our host star is full of surprises. Studying our Sun is the most essential facet of modern astronomy: not only does Sol provide us with the only example of a star we can study up close, but the energy it provides fuels life on Earth, and the space weather it produces impacts our modern technological civilization.

Now, a new study, titled The Acoustic Size of the Sun suggests that a key parameter in modern astronomy and heliophysics—the diameter of the Sun—may need a slight tweak.

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Earth’s Past and Future Habitability Depends on Our Protection from Space Weather

Sun with a huge coronal mass ejection. Image credit: NASA

A bewildering number of factors and variables led up to the planet we occupy today, where life finds a way to survive and even thrive in the most marginal conditions. The Sun is the catalyst for it all, propelling life on its journey to greater complexity with its steady fusion.

But the Sun is only benign because of Earth’s built-in protection, the magnetosphere. Both the Sun and the magnetosphere have changed over time, with each one’s strength ebbing and flowing. The Sun drives powerful space weather our way, and the magnetosphere shields the Earth.

How have these two phenomena shaped Earth’s habitability?

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Small Magnetic Fields Have a Big Impact on the Sun's Atmosphere

Arched loops of solar plasma that heat the Sun's corona. Credit: ESA & NASA/Solar Orbiter

Surrounding the brilliant Sun is a layer of diffuse plasma known as the corona. You can’t see it most of the time, but if you happen to experience a total eclipse, the corona is the glow that surrounds the shadow of the Moon. The corona is pale white, almost pink because it has a temperature of more than a million Kelvin. This is vastly hotter than the surface of the Sun, which is about 6,500 K. So how does the corona get so hot?

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A Last-Minute Addition to the Solar Orbiter Allows it to See More Deeply into the Sun’s Atmosphere

A clever astronomer made a last minute hack to the Solar Orbiter's Extreme Ultraviolet Imager, allowing it to capture better images. Image Credit: ESA & NASA/Solar Orbiter/EUI Team; F. Auchère et al (2023); Solar disc: NASA/STEREO

Spacecraft instruments are highly specialized and can take years to design, build, and test. But a last-minute hack to one of the instruments on the ESA’s Solar Orbiter has allowed the spacecraft to take some difficult observations it would otherwise have been unable to take.

It’s all because of one astronomer and an instrument door.

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India Follows its Lunar Mission by Sending a Spacecraft to Study the Sun

The launch of India's Aditya-L1 spacecraft, bound for the Earth-Sun L1 Lagrange Point to study the Sun. Credit: ISRO.

Amid its Chandrayaan-3 mission to the Moon, India’s space agency launched another satellite and this one will study the Sun.

The spacecraft, called Aditya-L1, is bound for the Earth-Sun L1 Lagrange Point, located 1.5 million km from Earth. This will give it a perfect perspective to watch the Sun, similar to NASA’s SOHO mission. It will reach its destination in about three months and then use seven instruments to observe the Sun, its atmosphere, and the solar environment.

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The Sun Gets Meteor Showers Too, But They’re Very Different

SolO view in the EUV on 30 March 2022 showing a partial section of the Sun with gas at 1 million degrees. Credit Patrick Antolin. Background image: ESA/Solar Orbiter EUI/HRI Licence type Attribution (CC BY 4.0)

The Sun dominates the Solar System in almost every way imaginable, yet much of its inner workings have been hidden from humanity. Over the centuries, and especially in the last few decades, technological advancements allowed us to ignore our mothers’ exhortations and stare at the Sun for as long as we want. We’ve learned a lot from all those observations.

A new study shows how the Sun experiences its own ‘meteor showers.’

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Thierry Legault’s Stunning Views of the Space Station (with spacewalking astronauts) Crossing in Front of Sunspots

The International Space Station transiting the Sun -- and two large sunspots --on June 9, 2023. Additionally, two astronauts, Steve Bowen and Woody Hoburg were outside the ISS on a spacewalk while this image was taken. Credit and copyright: Thierry Legault.

He’s done it again, outdoing even his own incredible work.

Over the years, we’ve written many articles to share the beautiful and mind-bending astrophotography of Thierry Legault. Each year he seems to come up with ideas to try to surpass even his own craziest attempts of astrophotography feats – such as capturing spy satellites in orbit, or snapping pictures of the International Space Station (ISS) transiting the Sun during a solar eclipse.

Now, he was able to take pictures of the ISS transiting the Sun while two astronauts were doing a spacewalk. As an added challenge, Legault made sure he was in the right place at the right time so he could capture the ISS (and astronauts) while they were passing by three enormous sunspots.

WHAT??

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