Cyclotron Resonances of Ions with Obliquely-Propagating Waves in Coronal Holes and the Fast Solar Wind

Details Cyclotron Resonances of Ions with Obliquely-Propagating Waves in Coronal Holes and the Fast Solar Wind Cyclotron Resonances of Ions with Obliquely-Propagating Waves in Coronal Holes and the Fast Solar Wind

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh22e05h&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH22E-05

Other

2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind, 7511 Coronal Holes, 7867 Wave/Particle Interactions

Scientific paper

UVCS/SOHO has provided observations of protons and ions in coronal holes which suggest the operation of ion-cyclotron heating and acceleration. Many models have concentrated on the interactions of particles with parallel-propagating ion-cyclotron waves. There is of course no reason to expect parallel propagation in the corona, so we consider here some consequences of oblique propagation. Following Stix (1992), we analytically calculate the energy absorbed by an ion moving in an obliquely-propagating electromagnetic wave. Resonances occur at harmonics of the gyro frequency, though we will show that the physical interpretations are quite different for electric field polarizations in, or perpendicular to, the plane containing k and Bo (k is wavenumber and Bo is the ambient magnetic field). Surprisingly, a resonance at the fundamental frequency can occur even if the wave is right-hand circularly polarized (i.e. opposite to the sense of the gyromotion). We suggest, therefore, that resonances with the fast/whistler branch, which are often overlooked, may play a role in the heating of ions and protons in coronal holes as long as the waves are oblique. We will discuss possible sources of such waves. We will also summarize other consequences of oblique propagation for the resonant heating of coronal holes and the origin of the fast solar wind. Stix, T.H., Waves in Plasmas, AIP, New York, 1992.

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