Breakdown of adiabaticity for electron Maxwellian distribution through a stationary/nonstationary perpendicular supercritical shock.

Details Breakdown of adiabaticity for electron Maxwellian distribution through a stationary/nonstationary perpendicular supercritical shock. Breakdown of adiabaticity for electron Maxwellian distribution through a stationary/nonstationary perpendicular supercritical shock.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh31a0393s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH31A-0393

Physics

2154 Planetary Bow Shocks, 6939 Magnetospheric Physics (2700)

Scientific paper

Test particle simulations are performed in order to analyze in details the dynamics of transmitted electrons through a supercritical strictly perpendicular collisionless shock. Recent analysis has evidenced three different behavior for the electron population: (i) adiabatic, (ii) over-adiabatic characterized by an increase of the gyrating velocity higher than that expected from the conservation of the magnetic moment and (iii) under- adiabatic characterized by a decrease of this velocity and not predicted by any existing theory. Analysis of individual time particle trajectories is performed and completed by statistics based on different upstream distributions (spherical shell and Maxwellian). The use of a Maxwellian distribution function allows us to speak in term of an electronic temperature and we observe in agreement with experimental datas that as the temperature increases (enlarged Maxwellian distribution function) the number of non-adiabatic transmitted electrons drastically decreases. In addition, our study evidenced that both non-adiabatic populations are coming from the core of the electron distribution. All combined nonstationary and nonuniformity effects have a filtering impact on the relative percentages of adiabatic and over-adiabatic populations, in contrast with under- adiabatic population which is relatively poorly affected.

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