The Boltzmann H Function and Entropy in the Plasma Sheet

Details The Boltzmann H Function and Entropy in the Plasma Sheet The Boltzmann H Function and Entropy in the Plasma Sheet

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm24a..04k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM24A-04

Physics

2744 Magnetotail, 2764 Plasma Sheet

Scientific paper

The Boltzmann H function was evaluated by integrating the product [f*(lnf)] based on ten years of 1-minute averaged electron and ion velocity distribution functions, f(v). Data came from the magnetometer and Comprehensive Plasma Instrumentation on the Geotail satellite. Long term averages of H, of particle densities, and of the magnetic field were used to determine the entropy density, entropy per unit flux tube, and entropy per particle. Spatial variations near the neutral sheet of the long term averages of these parameters are being studied in the -30 < x < -10 Re region. The observations contain information about irreversible processes that take place in the plasma sheet. The data also provide information about the spatial distribution of deviations from equilibrium. The current status of this project will be described.

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