Physics – Plasma Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1442p&link_type=abstract
Journal of Geophysical Research, Volume 108, Issue A12, pp. SMP 14-1, CiteID 1442, DOI 10.1029/2003JA010092
Physics
Plasma Physics
18
Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Magnetic Reconnection, Space Plasma Physics: Waves And Instabilities, Space Plasma Physics: Kinetic And Mhd Theory
Scientific paper
Vlasov simulations of the current-driven ion-acoustic instability produced in Maxwellian and non-Maxwellian (Lorentzian, κ = 2) electron-ion plasma with number density 7 × 106 cm-3, reduced mass ratio mi/me = 25, and electron to ion temperature ratio Te/Ti = 1 are presented and compared. A concise stability analysis of current-driven ion-acoustic waves in Maxwellian and non-Maxwellian plasmas modeled by generalized Lorentzian distribution function with index 2 <= κ <= 7 and electron to ion temperature ratio 1 <= Te/Ti <= 100 is also presented. The ion-acoustic instability is excited in low temperature ratio Lorentzian (κ = 2) plasma for lower absolute electron drift velocity (up to half the critical electron drift velocity of a Maxwellian). The anomalous resistivity resulting from ion acoustic waves in a Lorentzian plasma is a strong function of the electron drift velocity and in the work presented here varies by a factor of ~100 for a 1.5 increase in the electron drift velocity. Furthermore, ion-acoustic anomalous resistivity is excited for electron drift velocities that would be stable for Maxwellian plasmas. The magnitude of resistivity which can be generated by unstable ion-acoustic waves may be important for magnetic reconnection at the magnetopause.
Freeman Mervyn. P.
Horne Richard B.
Petkaki Panagiota
Watt Clare E. J.
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