Field annihilation and particle acceleration in solar flares

Details Field annihilation and particle acceleration in solar flares Field annihilation and particle acceleration in solar flares

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975azh....52..738p&link_type=abstract

Astronomicheskii Zhurnal, vol. 52, July-Aug. 1975, p. 738-751. In Russian.

Astronomy and Astrophysics

Astronomy

11

Annihilation Reactions, Magnetohydrodynamic Turbulence, Particle Acceleration, Solar Flares, Solar Magnetic Field, Ion Acoustic Waves, Landau Damping, Solar Protons, Stellar Mass Ejection

Scientific paper

Magnetic-field annihilation in a neutral current sheet, a process associated with the production of ion-acoustic turbulence, is investigated as a particle-acceleration mechanism during the outburst phase of solar flares. It is shown that laminar gas flow along a neutral sheet under the action of magnetic forces cannot account for the power output of flares and that the ejection of gas from a sheet is a more likely triggering mechanism. The average velocity of such ejection may attain 0.1 of the Alfven velocity, assuring the high power output during the outburst phase. It is found that the intensification of gas ejection during this phase may be associated with either development of the tearing-mode instability within the neutral sheet or a modulation instability. The energy spectrum of accelerated particles is shown to depend on the loss mechanism and the turbulence spectrum. Proton acceleration by Langmuir waves, which is due to Landau damping of ion-acoustic turbulence, is found to require considerable preliminary acceleration.

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