Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41c1893m&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM41C-1893
Physics
Plasma Physics
[7859] Space Plasma Physics / Transport Processes
Scientific paper
The near Earth plasma sheet density and the ion temperature change distinctively following a northward turning of the interplanetary magnetic field (IMF) [e.g., Fujimoto et al., 1996; Terasawa et al., 1997; Øieroset et al., 2002]. For example, the typical near Earth plasma sheet density of 0.3 cm-3 typically increases by a factor of 3 and the ion temperature decreases from a few keV to 1 keV or less [Terasawa et al., 1997]. This regime of the plasma sheet has been termed the cold dense plasma sheet (CDPS). The CDPS often consists of a mixture of magnetosheath (cold) and magnetospheric (hot) plasma [Fujimoto et al., 1996, 1998, 2002; Fuselier et al., 1999; Phan et al., 2000]. Observations suggest this two-component distribution of ions consists of a colder, magnetosheath-like component that is dominant near the flanks, and a hotter component that is dominant near midnight [Wing et al., 2005; Wang et al., 2007]. Wing et al. [2005] show evidence that the longer the northward IMF interval, the cooler the hot-component ions become. In this study we simulate the trajectories of 100 eV - 15 keV ions in the plasma sheet during ten hours of continuous northward IMF in order to understand how the energy distribution of plasma sheet particles evolves. The primary questions that we investigate are: How does the hot component of plasma sheet ions evolve during northward IMF intervals, and can transport explain the cooling of the hot component ions during extended periods of northward IMF?
Lemon Colby
Lyons Larry R.
Mata W. J.
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