Ion-cyclotron waves in Solar Coronal Hole

Details Ion-cyclotron waves in Solar Coronal Hole Ion-cyclotron waves in Solar Coronal Hole

2011-09-07

arxiv.org/abs/1109.1474v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

18 pages, 5 figures, accepted by New Astronomy

Scientific paper

10.1016/j.newast.2011.08.008

We investigate the effect of the Plume/Interplume Lane (PIPL) structure of the solar Polar Coronal Hole (PCH) on the propagation characteristics of ion-cyclotron waves (ICW). The gradients of physical parameters determined by SOHO and TRACE satellites both parallel and perpendicular to the magnetic field are considered with the aim of determining how the efficiency of the ICR process varies along the PIPL structure of PCH. We construct a model based on the kinetic theory by using quasi-linear approximation. We solve the Vlasov equation for O VI ions and obtain the dispersion relation of ICW. The resonance process in the interplume lanes is much more effective than in the plumes, agreeing with the observations which show the source of fast solar wind is interplume lanes. The solution of the Vlasov equation in PIPL structure of PCH, the physical parameters of which display gradients along and perpendicular direction to the external magnetic field, is thus obtained in a more general form than the previous investigations.

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