Ion cyclotron instability triggered by drifting minor ion species: Cascade effect and exact results

Details Ion cyclotron instability triggered by drifting minor ion species: Cascade effect and exact results Ion cyclotron instability triggered by drifting minor ion species: Cascade effect and exact results

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004p%26ss...52..679g&link_type=abstract

Planetary and Space Science, Volume 52, Issue 8, p. 679-684.

Physics

1

Ion-Cyclotron, Drifting Ions, Cascade Effect, Coronal Holes, Solar Wind, Heating, Acceleration

Scientific paper

On the basis of bi-Maxwellian velocity distribution functions it has been recently shown that the combined effect of heavy ion thermal anisotropy and drift velocity can trigger ion-cyclotron instabilities beyond the corresponding heavy ion-cyclotron frequency. (Proton-cyclotron instability induced by the thermal anisotrophy of minor ions. J. Geophys. Res. 107 (2002) 1494; Ion-cyclotron instability due to the thermal anisotrophy of drifting ion species. J. Geophys. Res. 108 (2003) 1050.) Here we show that the cascade-type mechanism proposed by Gomberoff and Valdivia (2002, 2003) can take place in the region where main heating of the fast solar wind seems to occur (i.e. within 10 solar radii). We also compare some of the results obtained by using the semi-cold approximation with the exact kinetic dispersion relation.

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