Destabilization of Alfven waves in flashing loops of the solar corona

Details Destabilization of Alfven waves in flashing loops of the solar corona Destabilization of Alfven waves in flashing loops of the solar corona

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001kfnt...17..340k&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 17, no. 4, p. 340-347

Physics

Scientific paper

Based on kinetic theory, the destabilization of Alfven waves by energetic (superthermal) ions in magnetized plasma is studied. Expressions for the growth rate and instability threshold are obtained. The instability arises because of the interaction of the energetic ions and the waves through the cyclotron resonance, and it is characterized by the wave numbers of the order of the inverse Larmor radius of energetic ions. It is shown that the existence of a small fraction of superthermal ions with the distribution function having a sharp maximum at a certain pitch angle may cause this instability. The instability considered can arise in plasmas of flashing loops in the solar corona, the characteristic time of its development being 0.01-0.1 s for the relative density of energetic ions n_{alpha}/n_{i}≥ 10(-5) .

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