Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh31a1085p&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH31A-1085
Physics
7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection, 7867 Wave/Particle Interactions, 7871 Waves And Instabilities
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 7x 106 cm-3, reduced mass ratio mi/m_e=25 and electron to ion temperature ratio Te/T_i=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/T_i <= 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 maybe important for magnetic reconnection at the magnetopause.
Freeman Mervyn. P.
Horne Richard B.
Petkaki Panagiota
Watt C. E.
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