Minor heavy ion electromagnetic beam-plasma interactions in the solar wind

Details Minor heavy ion electromagnetic beam-plasma interactions in the solar wind Minor heavy ion electromagnetic beam-plasma interactions in the solar wind

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10113517g&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A6, p. 13517-13522

Physics

Plasma Physics

19

Space Plasma Physics: Waves And Instabilities, Interplanetary Physics: Solar Wind Plasma

Scientific paper

It is shown that the velocity threshold of the right-hand-polarized ion-ion resonant instability decreases with decreasing gyrofrequency values of the beam ions, and also, the system can become unstable for very small beam concentrations. In order to illustrate the results, a plasma consisting of a proton background and a very tenuous O+ ion beam is considered. It is shown that for an ion beam of nO+/np=10-4, the threshold velocity is VO+~1.36VA (VA is the Alfvén velocity), and the maximum growth rate is of the order of 10-3Ωp (Ωp is the proton gyrofrequency). We apply these results to high-speed solar-wind-type plasmas consisting of a proton background, an alpha particle beam, and a beam of O+ ions. It is also shown that the presence of alpha particles reduces the velocity instability threshold of the O+-p resonant instability.

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