Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11d1129o&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH11D-1129
Physics
7509 Corona, 7511 Coronal Holes, 7524 Magnetic Fields, 7827 Kinetic And Mhd Theory, 7867 Wave/Particle Interactions
Scientific paper
We investigate low-frequency Alfvén waves in a multi-ion coronal plasma by deriving the dispersion relation of the linearized three-fluid equations in magnetized plasma with coronal parameters. We study the effect of collisions on the velocity amplitude of minor ions due to the Alfvén waves compared to the proton wave amplitude. We find that in the collisionless plasma the minor ion velocity is reduced by the factor Z/A compared to protons, where Z is the ion charge, and A is mass in units of proton mass. When the collision frequency is much larger then the Alfvén wave frequency the velocity amplitude of the minor ions is equal to the proton velocity amplitude. We show the effects of minor ions and collisions on the dispersion relation of Alfvén waves in the three fluid plasma. In view of our results we show how the observed nonthermal line broadening of minor ions relates to the wave motions of protons as a function of heliocentric distance, and the plasma physical parameters.
Davila Jose Manuel
Nakariakov Valery M.
Ofman Leon
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