Vlasov Simulations of Ion-Acoustic Instabilities in Non-Maxwellian Space Plasmas: Enhanced Anomalous Resistivity.

Details Vlasov Simulations of Ion-Acoustic Instabilities in Non-Maxwellian Space Plasmas: Enhanced Anomalous Resistivity. Vlasov Simulations of Ion-Acoustic Instabilities in Non-Maxwellian Space Plasmas: Enhanced Anomalous Resistivity.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11b0440p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11B-0440

Astronomy and Astrophysics

Astrophysics

7835 Magnetic Reconnection, 7843 Numerical Simulation Studies, 7871 Waves And Instabilities

Scientific paper

Results of a one-dimensional electrostatic Vlasov simulation study of ion-acoustic waves in a collisionless plasma are presented. The waves are current-driven unstable. We model the plasma using Lorentzian distribution functions of electrons and ions for similar particle temperatures. Lorentzian (kappa) distributions are observed in planetary magnetospheres, astrophysical plasmas and the solar wind. Stability curves of the Lorentzian plasma for several values of the high energy tail parameter κ are calculated and compared with the Maxwellian stability curve. The threshold for wave growth at given absolute current density is reduced for a Lorentzian distribution and the region of resonance in velocity space is narrower. These two effects are responsible for increasing the anomalous resistivity in the Lorentzian plasma with respect to that in a Maxwellian plasma, which itself has been previously shown by us to be three orders of magnitude above some analytical estimates [Watt et al., Geophys Res. Lett, 29, 10.1029/2001GL013451, 2002]. Hence the form of the distribution function can be a significant factor in electron diffusion across the magnetic field in the reconnection site in the earth's magnetopause region and in similar space plasmas.

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