scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
Variations of proton temperature and density during magnetic storm: modeling and
comparison with experimental data.
Kotova Galina 1 , Verigin Mikhail 1 , Bezrukikh Vladilen 1 , Bogdanov Vadim 2
1 Space Research Institute of RAS, Moscow, Russia, 2 Institute of Cosmophysical Research and Radio
Wave Propagation, FEB of RAS, Kamchatka, Russia
INTERBALL 2 and MAGION 5 measurements in the Earth’s inner magnetosphere revealed
that during magnetic storm main phase, plasmaspheric ion temperature mostly fell down
while ion density either increased or stayed at the level typical for undisturbed conditions. A
physical mechanism describing outward proton drift which causes ion temperature decreasing
during magnetic storm is considered. It is shown that for the thermal plasma in the equatorial
plane the third adiabatic invariant is conserved even in the processes with characteristic time
less than charged particle drift time around the Earth. Model temperatures well agree with
experimental data.
The work is partially supported by the RAS programs P16 and OFN 15.