On the Generation and Dissipation of Ion Cyclotron Waves in the Extended Solar Corona

Details On the Generation and Dissipation of Ion Cyclotron Waves in the Extended Solar Corona On the Generation and Dissipation of Ion Cyclotron Waves in the Extended Solar Corona

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999eostr..80..800c&link_type=abstract

Eos Trans. AGU, 80 (46), Fall Meeting Suppl., F800 (SH21A-06)

Astronomy and Astrophysics

Astrophysics

Solar Corona, Solar Wind, Alfven Waves, Ion Cyclotron Resonance, Sobolev Approximation, Mhd Wave Damping

Scientific paper

The dissipation of high frequency (10 to 10,000 Hz) ion cyclotron resonant Alfven waves has been proposed as a leading candidate for the heating of the extended solar corona and the acceleration of the high speed solar wind. The competition between various wave generation mechanisms and resonant wave damping is examined in detail, and a database of more than 2000 low-abundance ion species is taken into account for completeness. Also, the Sobolev approximation from the theory of hot star winds is applied to the gyroresonant wave-particle interaction in the solar wind, and the surprisingly effective damping ability of ``minor'' ions is explained in simple terms. High frequency waves (propagating parallel to open magnetic field lines) that originate at the base of the corona are damped significantly when they resonate with ions having charge-to-mass ratios of about 0.1. Thus, if the waves came solely from the coronal base, there would be negligible wave power available to resonate with higher charge-to-mass ratio ions at larger heights. This result confirms preliminary suggestions from earlier work that the waves that heat and accelerate the high speed solar wind must be generated throughout the extended corona. This work is supported by the National Aeronautics and Space Administration under grant NAG5-7822 to the Smithsonian Astrophysical Observatory, by Agenzia Spaziale Italiana, and by the ESA PRODEX program (Swiss contribution).

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