Long-lived sources of solar cosmic rays

Details Long-lived sources of solar cosmic rays Long-lived sources of solar cosmic rays

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aipc...56..163m&link_type=abstract

In: Particle acceleration mechanisms in astrophysics; Proceedings of the Workshop, La Jolla, Calif., January 3-5, 1979. (A80-532

Astronomy and Astrophysics

Astrophysics

1

Magnetohydrodynamic Waves, Particle Acceleration, Shock Wave Propagation, Solar Cosmic Rays, Solar Flares, Solar Magnetic Field, Neutral Sheets, Particle Interactions, Shock Heating, Solar Corona

Scientific paper

The high correlation between prompt solar cosmic rays and a flare-induced MHD shock is well known. It is pointed out that the propagation properties of such a shock cause shock heating of the solar atmosphere to be confined to a unipolar magnetic region. As a result, if particles can be accelerated within the shock-processed part of the corona, the fluxes of such particles will exhibit sharp spatial gradients near quiescent filaments. The passage of an MHD shock leads to the rapid collapse of magnetic neutral regions which prior to shock passage were collapsing too slowly to accelerate particles. It is suggested that these newly triggered magnetic acceleration regions provide a third phase of solar flare acceleration which may persist for many days after a flare. Collapsing magnetic regions with length scales of order 100 km can explain a variety of coronal phenomena.

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