Resonant Heating and Acceleration of Ions in Coronal Holes by High-Frequency Wave Spectrum

Details Resonant Heating and Acceleration of Ions in Coronal Holes by High-Frequency Wave Spectrum Resonant Heating and Acceleration of Ions in Coronal Holes by High-Frequency Wave Spectrum

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11a0696o&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH11A-0696

Physics

7511 Coronal Holes, 7827 Kinetic And Mhd Theory, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions, 7871 Waves And Instabilities

Scientific paper

Recent observations and models suggest that the resonant absorption of ion cyclotron waves heats and accelerates the ions in the solar wind. Velocity distributions of minor ions derived from SOHO UVCS observations in coronal holes indicate that the minor ion temperature anisotropy >10 and outflow speeds is higher then the solar wind protons. Using 1D hybrid code we investigate the effects of differential flow and anisotropy on the stability of the solar wind plasma. We investigate the heating and the acceleration of the solar wind plasma ions by including an input spectrum of the form f-1 and f-5/3. We find that the ion heating strongly depends on the power contained in the frequency range of the power-law spectrum that can resonate with the ions. The heating also depends on the plasma β , and the abundance of the minor ions. We investigate the self-consistent fluctuations spectrum generated by the response of the ions. We have used second-order theory (Gary and Tokar 1985) to evaluate the rates of proton heating, anisotropy formation, and acceleration, and have compared these predictions against the simulation results.

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