Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field

Details Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11206233z&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A6, CiteID A06233

Physics

4

Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Energetic Particles: Trapped

Scientific paper

Several mechanisms have been used to explain solar wind plasma entry into the plasma sheet in the magnetotail. In this paper, we focus on the gradient drift entry (GDE) process in the equatorial flanks of the magnetosphere, based on the magnetopause picture of a tangential discontinuity with a small tangential electric field as was suggested by Alfvén (1968). We discuss the GDE efficiency in different conditions using the adiabatic theory. It can be clearly shown that the GDE efficiency is much lower during southward interplanetary magnetic field (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 several kiloelectron volts. Only those particles with higher energy can penetrate the magnetopause, a condition which can be also proved by test particle simulations. The lower efficiency than that during northward IMF during periods of southward IMF is in agreement with the different properties of the plasma sheet observed, i.e., hot and tenuous when the IMF is southward, cold and dense for northward IMF.

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