Physics – Plasma Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29n..32l&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 14, pp. 32-1, CiteID 1687, DOI 10.1029/2002GL015100
Physics
Plasma Physics
3
Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Numerical Modeling, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Shock Waves
Scientific paper
A two-dimensional global hybrid simulation is carried out to study the ion velocity distributions in the dayside magnetosheath in the presence of a northward interplanetary magnetic field. In the simulation, the bow shock and the magnetosheath form self-consistently by the interaction between the solar wind and the geomagnetic field. Downstream of the quasi-perpendicular shock, the initial isotropic distribution of upstream ions first becomes an oval-shaped bi-Maxwellian distribution with the perpendicular temperature T⊥ greater than the parallel temperature T∥. These downstream ions are then found to evolve to a conic-like or D-shaped distribution in the high-latitude magnetosheath prior to the transmission into the magnetosphere. The presence of the D-shaped distribution is due to the adiabatic ion motion from the subsolar magnetosheath with a high magnetic field strength to high latitudes with a lower field, but not due to magnetic reconnection at the high-latitude magnetopause.
Lin Yangtin
Wang Xiang-Yu
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