Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm11b2024j&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM11B-2024
Physics
Plasma Physics
[2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2764] Magnetospheric Physics / Plasma Sheet, [7859] Space Plasma Physics / Transport Processes
Scientific paper
Entropy provides important constraints on how the plasma sheet is populated. The local (intensive) and global (extensive) entropies each provide information about source populations and accessibility of those populations to regions of the plasma sheet. Changes in entropy are indicators of nonadiabatic processes that may be associated with plasma entry and/or transport within the plasma sheet. We present DMSP measurements of plasma density, pressure, temperature and entropy and discuss the origin of the hot and cold populations. We discuss changes in the entropy in the context of entry mechanisms such as poleward of the cusp reconnection, Kelvin-Helmholtz instability, kinetic Alfven wave turbulence, and ionospheric outflows. We also discuss possible sources of asymmetries in the cold, dense plasma sheet and the dependence on the Parker spiral orientation.
Johnson Jesse
Lin Yangtin
Wing Simon
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