Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21b1451o&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA21B-1451
Physics
[2442] Ionosphere / Meteor-Trail Physics
Scientific paper
Tens of millions of detectable meteors ablate in the Earth's upper atmosphere each second, creating turbulent plasma trails which persist for up to minutes as they dissipate into the background ionosphere. These trails produce easily detected radar signals with a wealth of information. We present the first 3D simulations of the turbulent diffusion of a dense column of meteor plasma embedded in a background ionosphere. While the meteor diffuses across the Earth's geomagnetic field B0, large electric fields develop because of the interplay between highly mobile but magnetized electrons and the heavier but collisionally demagnetized ions. As is typical in plasmas, these fields point mostly perpendicular to B0 and change slowly in the direction of B0. These simulations show that the electric field causes a substantial restructuring of the ionospheric plasma outside the trail but connected to it via B0. They also demonstrate the diffusive expansion of the trail and the development of waves both within and outside the trail. These massively parallel particle-in-cell (PIC) simulations reveal the nature of the highly anisotropic diffusion of meteors with some interesting surprises.
Dimant Ya. S.
Oppenheim Meers M.
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