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Fraser
2005-Dec-13, 07:30 PM
SUMMARY: On Earth we have the Northern and Southern Lights, and there's a similar phenomenon on Mars too. But instead of sticking to the planet's poles, these faint auroras can show up anywhere on the planet; wherever there are patches of strong magnetic fields. Over the past six years, NASA's Mars Global Surveyor has turned up 13,000 aurora events on the Red Planet, and mapped their locations. These mini magnetic fields can potentially protect the planet's surface from the Sun's solar wind.

View full article (http://www.universetoday.com/am/publish/martian_auroras.html)
What do you think about this story? post your comments below.

Rivertree
2006-Jul-30, 01:35 AM
These mini magnetic fields can potentially protect the planet's surface from the Sun's solar wind.

View full article (http://www.universetoday.com/am/publish/martian_auroras.html)
What do you think about this story? post your comments below.

More quote


"We call them mini-magnetospheres, because they are strong enough to stand off the solar wind," Lin said, noting that the fields extend up to 1,300 kilometers above the surface. Nevertheless, the strongest Martian magnetic field is 50 times weaker than the field at the Earth's surface. It's hard to explain how these fields are able to funnel and accelerate the solar wind efficiently enough to generate an aurora, he said.

A solar wind funnel. Hmmm. Sounds interesting.



According to the physicists, the auroras on Mars aren't due to a planet-wide magnetic field, but instead are associated with patches of strong magnetic field in the crust, primarily in the southern hemisphere. And they probably aren't as colorful either, the researchers say: The energetic electrons that interact with molecules in the atmosphere to produce the glow probably generate only ultraviolet light - not the reds, greens and blues of Earth.

I wonder if any of them are visible light?

Location of Aurora on Mars
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=37527

"Mars Express (MEX) observed an ultraviolet flash of light"
http://sprg.ssl.berkeley.edu/~brain/rsrch/marsaurora.html

aurora : a luminous phenomenon that consists of streamers or arches of light appearing in the upper atmosphere of a planet's magnetic polar regions and is caused by the emission of light from atoms excited by electrons accelerated along the planet's magnetic field lines

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Parallel items for comparison sakes.
(ultraviolet proton aurora)
Ultraviolet aurora on earth
http://www.arrl.org/news/stories/2003/12/16/1/StormySpace-4-lrg.jpg

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I wonder if I can get an ultraviolet viewer for the Michigan skies:eh:

Rivertree
2006-Jul-30, 01:46 AM
I wonder if I can get an ultraviolet viewer for the Michigan skies:eh:



The one I found requires a price quote (sounds pricey).
Also, it says it involves 12kVolts in a self contained high voltage power supply.

Who knows? Maybe, I can find a used one on e-auction :) (that probably leaks radiation or something). :(

bluespoon
2006-Jul-30, 01:48 AM
there are no auroras on Martian poles because it has no "magnetic" poles. Mars has no underground lava flow,thus,no magnetic field at all. Solar winds have no "particular" place to go.So it may well be that auroras are -EVERYWHERE.

Rivertree
2006-Aug-02, 01:14 AM
I DON'T SEE ANYTHING. Sorry, am simply I missing them or don't I know what I'm looking for?

I think it's just a picture of Terra Cimmeria w.o. auroras.

Quote is followed with picture and source article links:
Auroras were detected from Terra Cimmeria in the southern hemisphere of Mars. (Courtesy: NASA/ESA) Auroras were detected from Terra Cimmeria in the southern hemisphere of Mars. (Courtesy: NASA/ESA)

http://www.cbc.ca/gfx/pix/mars_aurora_esaimage.jpg

http://images.search.yahoo.com/search/images/view?back=http%3A%2F%2Fimages.search.yahoo.com%2Fs earch%2Fimages%3Fp%3Dmartian%2Baurora%26fr%3DFP-tab-img-t-t400%26toggle%3D1%26cop%3D%26ei%3DUTF-8&w=220&h=224&imgurl=www.cbc.ca%2Fgfx%2Fpix%2Fmars_aurora_esaima ge.jpg&rurl=http%3A%2F%2Fwww.cbc.ca%2Fstory%2Fscience%2Fn ational%2F2005%2F06%2F09%2FMars-aurora050609.html&size=10.8kB&name=mars_aurora_esaimage.jpg&p=martian+aurora&type=jpeg&no=12&tt=81&ei=UTF-8

sol88
2006-Aug-02, 01:36 AM
Could there be a correlation between these "magnetic" auroras and the electric dust devils/storms???

Sol

Rivertree
2006-Aug-04, 12:29 AM
Could there be a correlation between these "magnetic" auroras and the electric dust devils/storms???

Sol

Yes -- everything is connected.
Don't let anyone ever tell you otherwise.
=Peace=

(Martian dust devils can be greater than 500 meters in diameter and several thousand meters high.)