Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51a1389z&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51A-1389
Physics
2720 Energetic Particles: Trapped, 2724 Magnetopause And Boundary Layers, 2728 Magnetosheath, 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
A set of mechanisms have been established to explain the entry of solar wind plasma to the plasma sheet in the magnetotail. In this paper, we mainly focus on a gradient drift entry (GDE) process in the equatorial flanks of the magnetosphere, and theoretically discuss its efficiency in different conditions using the adiabatic theory. It can be clearly shown that the GDE efficiency is much lower during southward IMF, with a strong energy filter effect for incoming solar wind particles. Given a typical condition, a critical energy for particle entry is calculated to be around ten keV. Only those particles with higher energy can penetrate the magnetopause, which can be also proved by test particle simulations. The lower efficiency in this condition is in agreement with the hot tenuous plasma sheet observed during periods of southward IMF.
Pu Zhang
Zhou Xiangfa
Zong Qiugang
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