Numerical simulations of counterstreaming plasmas and their relevance to interhemispheric flows

Details Numerical simulations of counterstreaming plasmas and their relevance to interhemispheric flows Numerical simulations of counterstreaming plasmas and their relevance to interhemispheric flows

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7867s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Oct. 1, 1983, p. 7867-7877.

Physics

31

Magnetic Storms, Magnetohydrodynamic Flow, Plasmasphere, Space Plasmas, Computerized Simulation, Coulomb Collisions, Ion Beams, Ion Cyclotron Radiation, Velocity Distribution

Scientific paper

The collisionless expansion of counterstreaming plasmas has been studied in order to elucidate the basic physical processes that may be operating during the initial refilling of depleted flux tubes after a magnetic storm. The numerical technique applied is briefly described, and simulation results are presented. The simulation geometry consisted of two high-density H(+)-O(+) electron plasmas separated by a low-density H(+)-electron plasma. The temporal evolution of the expanding plasmas and the electostatic potential in the region between the two sources is described. The main interacting streams are found to be stable with respect to both the ion acoustic and ion cyclotron modes and only the suprathermal forerunner ions are unstable with respect to the ion cyclotron mode. The results also suggest that a localized potential hill can form at the equator and that this potential hill can play an important role in the subsequent trapping and thermalization of the ion streams.

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