Interesting article on magnetic shielding from solar wind (a plasma) in space
Posted: 22 July 2010 01:23 AM   [ Ignore ]
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This might be of interest.  It talks about how even a small magnetic field can be used to repel the solar wind - comprising protons & electrons in a plasma.  It notes a particular effect of the plasma interacting with the small magnetic field that causes a repulsion effect much larger than what was originally expected.

It may be of interest & utility as so much of the FF is based on the interaction of plasmas with magnetic fields.

Pat


Magnetic sheild article

http://www.newscientist.com/article/mg20727701.300-shields-up-force-fields-could-protect-mars-missions.html?DCMP=NLC-nletter&nsref=mg20727701.300

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Posted: 26 July 2010 01:08 PM   [ Ignore ]   [ # 1 ]
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mchargue - 22 July 2010 05:23 AM

This might be of interest.  It talks about how even a small magnetic field can be used to repel the solar wind - comprising protons & electrons in a plasma.  It notes a particular effect of the plasma interacting with the small magnetic field that causes a repulsion effect much larger than what was originally expected.

It may be of interest & utility as so much of the FF is based on the interaction of plasmas with magnetic fields.

Pat


Magnetic sheild article

http://www.newscientist.com/article/mg20727701.300-shields-up-force-fields-could-protect-mars-missions.html?DCMP=NLC-nletter&nsref=mg20727701.300

I find it quite strange no-one had considered this earlier.  However the wording of the article seems a little strange

The Larmor radius of the particles in that weedy magnetic field is about 120 millimetres: they should have smashed right into the magnet. But they didn’t

This seems to suggest a weak field results in a small larmor radius.  It is the other way round: r=mv/qB, where v is velocity perpendicular to the field.

for protons; taking the component of the velocity as 100km/s (typical solar wind) and r=120mm gives the B field they used as ~ 100Gauss, which is orders of magnitude stronger than the Earth’s.

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Posted: 26 July 2010 07:20 PM   [ Ignore ]   [ # 2 ]
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The draft of the paper is available without a paywall here: http://arxiv.org/abs/0802.0107 (it didn’t like my Firedownload and Firetorrent addons, so I had to disable them. Using a non-Firefox browser also works.)

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