mercury-magnetic-tornadoes

How Magnetic Tornadoes Might Regenerate Mercury’s Atmosphere

3 Jun , 2009

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Compared to Earth, Mercury doesn’t have much of an atmosphere.  The smallest rocky planet has weak surface gravity, only 38% that of Earth.  And the scorching-hot daytime surface temperatures of 800 degrees Fahrenheit (approximately 450 degrees Celsius) should have boiled away any trace of Mercury’s atmosphere long ago.  Yet recent flybys of the MESSENGER spacecraft clearly revealed Mercury somehow retains a thin layer of gas near its surface.   Where does this atmosphere come from?

“Mercury’s atmosphere is so thin, it would have vanished long ago unless something was replenishing it,” says Dr. James A. Slavin of NASA’s Goddard Space Flight Center, Greenbelt, Md., a co-investigator on NASA’s MESSENGER mission to Mercury.

The solar wind may well be the culprit.  A thin gas of electrically charged particles called a plasma, the solar wind blows constantly from the surface of the sun at some 250 to 370 miles per second (about 400 to 600 kilometers/second).  According to Slavin, that’s fast enough to blast off the surface of Mercury through a process called “sputtering”, according to Slavin.  Some sputtered atoms stay close enough to the surface to serve as a tenuous yet measurable atmosphere.

But there’s a catch – Mercury’s magnetic field gets in the way. MESSENGER’s first flyby on January 14, 2008, confirmed that the planet has a global magnetic field, as first discovered by the Mariner 10 spacecraft during its flybys of the planet in 1974 and 1975.  Just as on Earth, the magnetic field should deflect charged particles away from the planet’s surface.  However, global magnetic fields are leaky shields and, under the right conditions, they are known to develop holes through which the solar wind can hit the surface.

During its second flyby of the planet on October 6, 2008, MESSENGER discovered that Mercury’s magnetic field can be extremely leaky indeed. The spacecraft encountered magnetic “tornadoes” – twisted bundles of magnetic fields connecting the planetary magnetic field to interplanetary space – that were up to 500 miles wide or a third of the radius of the planet.

“These ‘tornadoes’ form when magnetic fields carried by the solar wind connect to Mercury’s magnetic field,” said Slavin. “As the solar wind blows past Mercury’s field, these joined magnetic fields are carried with it and twist up into vortex-like structures. These twisted magnetic flux tubes, technically known as flux transfer events, form open windows in the planet’s magnetic shield through which the solar wind may enter and directly impact Mercury’s surface.”

Venus, Earth, and even Mars have thick atmospheres compared to Mercury, so the solar wind never makes it to the surface of these planets, even if there is no global magnetic field in the way, as is the case for Venus and Mars. Instead, it hits the upper atmosphere of these worlds, where it has the opposite effect to that on Mercury, gradually stripping away atmospheric gas as it blows by.

The process of linking interplanetary and planetary magnetic fields, called magnetic reconnection, is common throughout the cosmos. It occurs in Earth’s magnetic field, where it generates magnetic tornadoes as well. However, the MESSENGER observations show the reconnection rate is ten times higher at Mercury.

“Mercury’s proximity to the sun only accounts for about a third of the reconnection rate we see,” said Slavin. “It will be exciting to see what’s special about Mercury to explain the rest. We’ll get more clues from MESSENGER’s third flyby on September 29, 2009, and when we get into orbit in March 2011.”

Slavin’s MESSENGER research was funded by NASA and is the subject of a paper that appeared in the journal Science on May 1, 2009.

MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) is a NASA-sponsored scientific investigation of the planet Mercury and the first space mission designed to orbit the planet closest to the Sun. The MESSENGER spacecraft launched on August 3, 2004, and after flybys of Earth, Venus, and Mercury will start a yearlong study of its target planet in March 2011. Dr. Sean C. Solomon, of the Carnegie Institution of Washington, leads the mission as Principal Investigator. The Johns Hopkins University Applied Physics Laboratory, Laurel, Md., built and operates the MESSENGER spacecraft and manages this Discovery-class mission for NASA.

Source:  NASA


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Ivan3man_At_Large
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Ivan3man_At_Large
June 3, 2009 6:44 PM

No doubt that bloody Anaconda will turn up again to sell his usual brand of Snake Oil “Electric Universe” cosmology to explain everything! razz

Astrofiend
Member
Astrofiend
June 3, 2009 8:23 PM

Good to see Messenger paying handsome dividends already. Should be a veritable deluge of science when it settles into orbit…

Torbjorn Larsson OM
Member
Torbjorn Larsson OM
June 4, 2009 4:54 AM
Well, isn’t this a blast? D’oh! I assumed that thermal heating was primarily responsible for the atmosphere. Preferential sputtering by light ions is an even better explanation why light elements such as sodium are mentioned, or why water is seen. (Presumably solar wind hydrogen interacting with oxide minerals, or just liberating what’s already in the rocks.) IVAN3MAN, do you know if Anaconda and ilk is picturing snakes … eh, electrons all the way down? I assume gravitons and other particles are “illusions of scientists”, and that those with direct connection with the electronic cosmic mind knows who’s in charge. [Not that it is terribly interesting to untangle the confused web of thoughts of someone who can’t even master… Read more »
Torbjorn Larsson OM
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Torbjorn Larsson OM
June 4, 2009 5:06 AM

Um, “untangle” denialist claims is the wrong claim of course. It’s not doable as there are false assertions in there so one can add on stuff to show anything with such a mess, including contradictions.

“Prod” confused ideas is probably a better description. (Always a risky business around poisonous snakes!)

Anaconda
Member
Anaconda
June 5, 2009 11:45 AM
There was no reason to comment, the schematic speaks for itself: It has ELECTROMAGNETISM written all over it! As far as Larsson’s criticism? Well, let’s see: Larsson states, “I assume gravitons and other particles are ‘illusions of scientists’…” Last time I looked NOBODY has even CLAIMED to have found “gravitrons”. It’s a prediction of Quantum Mechanics…because…well…er…according to QM there has to be a particle for every force…so there must be “gravitrons”. Lots of Luck Larsson states: “Um, “untangle” denialist claims is the wrong claim of course. It’s not doable as there are false assertions in there so one can add on stuff to show anything with such a mess, including contradictions.” You and “modern” astronomy should look in… Read more »
Nereid
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Nereid
June 5, 2009 1:37 PM

What is “ELECTROMAGNETISM”, Anaconda?

I mean, what do mean by the term in your comment?

There was no reason to comment, the schematic speaks for itself: It has ELECTROMAGNETISM written all over it!

Specifically, how does your view of “ELECTROMAGNETISM” differ from

a) Maxwell’s equations?

b) QED?

Please be as specific as you can.

Please also state, clearly, the extent to which your view of “ELECTROMAGNETISM” may be described as consistent with contemporary physics.

ILOVETHESTAR
Member
ILOVETHESTAR
June 5, 2009 3:03 PM

IVAN3MAN Says
I am merely an amateur astronomer, and mostly into observational studies of whatever my telescope and CCD can pick up. Without mentioning names, you are correct that person with various brands of snake oil has returned!!!!!! Lol Where some alcoholic may have a cast-iron stomach to drink rut-gut wine and diesel fuel, this person must have a cast-iron patience to continously absorb
all types of downgrading, name-calling and is a glutton for more punishment!!!!! lol

Anaconda
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Anaconda
June 5, 2009 4:42 PM

@ Nereid:

What do I mean by electromagnetism?

That charged particles, electrons and ions, plasma, flow from the Sun to (in this case) Mercury, via Birkeland currents and once at Mercury interact with Mercury’s magnetosphere and surface in various processes as labled on the schematic in this post.

Pretty simple.

Oh, almost forgot and, of course, this is all entirely consistent with the tenents of Plasma Cosmology.

Even if it does give you and others a case of indigestion smile

Nereid
Member
Nereid
June 5, 2009 6:23 PM
Thanks for the swift response, Anaconda. Unfortunately, I don’t understand what you wrote: What do I mean by electromagnetism? That charged particles, electrons and ions, plasma, flow from the Sun to (in this case) Mercury, via Birkeland currents and once at Mercury interact with Mercury’s magnetosphere and surface in various processes as labled on the schematic in this post. If I may, here’s what I think your general idea of “ELECTROMAGNETISM” is: * a flow of charged particles in the IPM. If so, then that seems to me to be just another name for “the solar wind”. But your comment also includes mention of Birkeland currents, and interactions with planetary magnetospheres and surfaces. To what extent are Birkeland… Read more »
Anaconda
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Anaconda
June 6, 2009 5:01 AM
@ Nereid: Review the schematic. Notice the spirals that are labled, “Flux Transfer Events”, this is simply another name for Birkeland currents. The title of the post calls them magnetic tornadoes. They are a filamentary flow of electric currents constrained by tubular magnetic fields generated by the electric currents. Remember, you can’t have “magnetic” without the “electro” Obviously, electromagnetism is a broad general term. Nereid states: “If I may, here’s what I think your general idea of “ELECTROMAGNETISM” is: * a flow of charged particles in the IPM. If so, then that seems to me to be just another name for ‘the solar wind’.” Not exactly. The solar wind is a subset of electromagnetism. Birkeland currents are a… Read more »
Nereid
Member
Nereid
June 6, 2009 5:28 AM

Is light “ELECTROMAGNETISM”?

Is light “a subset of electromagnetism”?

Is the photoelectric effect either “ELECTROMAGNETISM” or “a subset of electromagnetism”?

Is the Compton effect either “ELECTROMAGNETISM” or “a subset of electromagnetism”?

Is synchrotron radiation either “ELECTROMAGNETISM” or “a subset of electromagnetism”?

Jon Hanford
Member
Jon Hanford
June 6, 2009 10:31 AM

@ Anaconda, above you state that the diagram / illustration “has electromagnetism written all over it”. Could you please provide peer-reviewed, published papers concerning specifically the Messenger observations and a strict PU-EU interpretation of these observations made by the MESSENGER probe? Possibly something beyond your unsubstantiated claims (and no press releases, blog stories, podcasts, etc.) ?

Ivan3man_At_Large
Member
Ivan3man_At_Large
June 6, 2009 12:35 PM

@ Anaconda,

I presume that my harmonious associates will concur when I request that you eschew obfuscation and espouse elucidation. wink

Nereid
Member
Nereid
June 6, 2009 12:41 PM

One more question if I may, Anaconda: what is “electrical energy”?

As Hannes Alfven, the Nobel Prize winner stated: Birkeland currents are the electric cables in space, which transport electrical energy over long distances.

(bold added)

Oh, and do you have a source for this? Specifically, in which publication did Alfvén state this (or, if at a conference, what conference)?

Ivan3man_At_Large
Member
Ivan3man_At_Large
June 6, 2009 4:42 PM

Anaconda:

As Hannes Alfvén, the Nobel Prize winner stated: Birkeland currents are the electric cables in space, which transport electrical energy over long distances.

Nereid:

Oh, and do you have a source for this? Specifically, in which publication did Alfvén state this…?

We know very well where the source for that and other stuff that Anaconda quotes; I just wonder if he remembered to wash his hands afterwards? wink

Ivan3man_At_Large
Member
Ivan3man_At_Large
June 8, 2009 10:51 PM

@ Anaconda:

*Crickets*

Anaconda
Member
Anaconda
June 9, 2009 9:34 AM
@ Ivan3Man: Your humor is juvenile and can be fun at times, but your scientific penetration is limited. At the moment I can’t find the “electric power cables in space” quote from Hannes Alfven, but I do have this one that is an equivalent: “In order to understand the phenomena in a certain plasma region, it is necessary to map not only the magnetic but also the electric field and the electric currents. Space is filled with a network of currents which transfer energy and momentum over large or very large distances. The currents often pinch to filamentary or surface currents. The latter are likely to give space, as also interstellar and intergalactic space, a cellular structure.” —… Read more »
Anaconda
Member
Anaconda
June 9, 2009 9:38 AM

@ Nereid:

What Hannes Alfven and others focussed on was the electron/ion electricity dynamic.

That should be clear to you, now, but I see you still are into passive/aggressive questions.

Ivan3man_At_Large
Member
Ivan3man_At_Large
June 9, 2009 1:08 PM

Anaconda:

Your humor is juvenile and can be fun at times, but your scientific penetration is limited.

Must everything have sexual connotations with you, Anaconda?

Jon Hanford
Member
Jon Hanford
June 9, 2009 3:18 PM

Anaconda states “At the moment I can’t find the “electric power cables in space” quote from Hannes Alfven….”. And this is the response from the PU/EC/EU proponent(s) ? Who is lacking in ‘scientific penetration’ now? Anaconda can’t seem to find a whole host of relevant papers that have been asked of him (and solrey, too, for that matter). As IVAN3MAN so eloquently put it “I presume that my harmonious associates will concur when I request that you eschew obfuscation and espouse elucidation.” smile

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