Physics – Plasma Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpprp1103t&link_type=abstract
American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #RP
Physics
Plasma Physics
Scientific paper
There are a variety of astrophysical phenomenon that generate ion ring distributions in velocity space perpendicular to the magnetic field. We used a 2 1/2 dimensional electromagnetic parallel PIC code and kinetic theory to look at instabilities of such ion ring distributions with magnetized electrons. We found an instability near the electron plasma frequency that is driven by the ring ions; this occurs even if the ion ring velocity is slower than the electron thermal velocity. The waves driven up by this instability are almost perpendicular to the magnetic field. The waves parallel k component is small so that the parallel phase velocity exceeds the initial electron thermal velocity. When the waves grow to sufficient intensity the the electrons absorb energy from the wave and accelerate down the field lines. We can compare our results to observations of solar flares where 10-100 kev xrays are seen. Using a 2 1/2 d PIC simulation of conditions likely to be present in coronal loops just before solar flares, with realistic mass ratios, we found electrons accelerated up to 100 kev. Work supported by NSF and UCLA Academic Senate.
Dawson John M.
Tonge John
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