Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43a1739k&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM43A-1739
Physics
[2744] Magnetospheric Physics / Magnetotail, [2764] Magnetospheric Physics / Plasma Sheet
Scientific paper
Geotail data from near the neutral sheet were used to study the spatial and flow speed dependencies of the entropy per unit volume, the entropy per unit flux tube, and the average entropy per particle. It was found that some interaction associated with the acceleration of fast flows was not isentropic. It also was found that entropy in the fastest flows exhibited little y-dependence, showing that the process that generates these flows near midnight is similar to the process that acts near the flanks. The PV^5/3 parameter that is commonly used to study variations of the entropy per unit flux tube along a streamline was found to be suitable to use whenever either the number of particles per unit flux tube or the energy invariant was being conserved. Problems related to statistical fluctuations of the counts per energy-angle box arose when evaluating a parameter designed to measure the deviation of the measured nonMaxwellian plasma from equilibrium. The most reliable result from this part of the study was that fast flow plasmas were farther from equilibrium than were slow flow plasmas.
Kaufmann Richard L.
Paterson William R.
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