Effective collision frequency due to ion-acoustic instability: Theory and simulations

Details Effective collision frequency due to ion-acoustic instability: Theory and simulations Effective collision frequency due to ion-acoustic instability: Theory and simulations

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3110806h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 10, CiteID L10806

Physics

Plasma Physics

16

Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Magnetic Reconnection, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Waves And Instabilities

Scientific paper

We study the ion-acoustic instability driven by a drift between Maxwellian protons and electrons in a nonmagnetized plasma using a Vlasov simulation with the realistic proton to electron mass ratio. Simulation results for similar electron and proton temperatures are in good agreement with predictions. Namely, during the linear and saturation phases the effective collision frequency observed in the simulation is in quantitative agreement with the quasi-linear predictions. However, previous estimates [Galeev and Sagdeev, 1984; Labelle and Treumann, 1988] give the effective collision frequency less than one tenth the simulated values. The theoretical and simulation results are in a partial agreement with the simulation work by Watt et al. [2002] who used a non-realistic mass ratio. After the saturation, the effective collision frequency increases owing to the existence of backward-propagating ion-acoustic waves. These waves result from induced scattering on protons and contribute to the anomalous transport of electrons.

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