Preferential Heating of Particles by H-Cyclotron Waves Generated by a Global Magnetohydrodynamic Mode in Solar Coronal Holes

Details Preferential Heating of Particles by H-Cyclotron Waves Generated by a Global Magnetohydrodynamic Mode in Solar Coronal Holes Preferential Heating of Particles by H-Cyclotron Waves Generated by a Global Magnetohydrodynamic Mode in Solar Coronal Holes

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...597l..69z&link_type=abstract

The Astrophysical Journal, Volume 597, Issue 1, pp. L69-L72.

Astronomy and Astrophysics

Astronomy

11

Acceleration Of Particles, Instabilities, Plasmas, Sun: Solar Wind, Sun: Corona, Waves

Scientific paper

Preferential heating of particles by H-cyclotron waves is investigated to explain the recent measurements of anisotropic heating of ions in solar coronal holes. First, the dispersion relation of H-cyclotron waves generated by a global MHD mode in the solar coronal hole is numerically studied. Then, heating of H, O+5, and Mg+9 due to the resonant and nonresonant dissipations of H-cyclotron waves is quantitatively studied. It is shown that H-cyclotron waves can be excited at a frequency ωRe,H~=(2.3-2.4)Ω4He, which corresponds to ~(3.68-3.84)ΩO+5 or ~(3.10-3.24)ΩMg+9, and thus can heat O+5 through the fourth harmonic resonance and Mg+9 through the third harmonic resonance. Here Ωσ is the cyclotron frequency of particle species σ. The H-cyclotron waves are efficient at heating O+5 if ωRe,H~=2.4Ω4He and Mg+9 if ωRe,H~=2.3Ω4He. Protons can only be weakly heated by the H-cyclotron waves through the nonresonant dissipation. The amount of heating for H, O+5, and Mg+9 can reach the order of measurements. Furthermore, the harmonic resonances of O and Mg with other charge states and of other heavy ions with proper charge states are discussed.

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