Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.4265g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 4265-4273.
Physics
1
Diamagnetism, High Temperature Plasmas, Ionospheric Heating, Plasma Temperature, Electric Fields, Geomagnetism
Scientific paper
Well-diagnosed simulation with an axisymmetric particle-in-cell code is used to investigate particle heating in a diamagnetic plasma expansion. Moments of the particle distribution function are obtained for spatially distinct subsets of the particles to examine temperature and density histories for different regions of the expanding plasma. The simulation is followed through one expansion-contraction cycle. While adiabatic behavior is observed during much of the cycle, significant deviations from the adiabatic result in strong particle heating. Anomalous ion heating occurs throughout the plasma during the expansion phase. This is manifested earliest in the ion parallel temperature, which increases first in the expanding plasma's outer reaches and last in the center. This heating originates from the entropy that is generated at the barrel ends of the plasma, as the initial expansion along the ambient field is essentially free. The ion heating that occurs can easily raise the bulk plasma temperature by an order of magnitude over the initial adiabat.
Gisler Galen R.
Onsager T. G.
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