Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11a0695m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH11A-0695
Other
7511 Coronal Holes, 7827 Kinetic And Mhd Theory, 7867 Wave/Particle Interactions, 7871 Waves And Instabilities
Scientific paper
We show that in a low-beta coronal hole plasma the electrostatic ion cyclotron instability driven by an electron heat flux can have a larger growth rate and a lower threshold than shear Alfven, magnetosonic, and whistler instabilities, with the most competitive instability being the shear Alfven instability. We will discuss the implications of this result for the heating of protons and heavier ions in coronal holes. To model the electron heat flux, we use a three-component plasma consisting of protons, core electrons, and halo electrons drifting with respect to each other. We consider distribution functions that are stable to higher-frequency and potentially faster-growing electron instabilities. We demonstrate that in this case the heat flux is sufficient to drive the ion cyclotron and shear Alfven instabilities with growth rates that are high enough to give significant heating of protons and heavy ions.
Hollweg Joseph V.
Markovskii Sergei A.
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