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Gamma Rays from Solar Flares View all abstracts by submitter

Reuven Ramaty   Submitted: 1999-11-04 17:05

Gamma-ray emission is the most direct diagnostic of energetic ions and relativistic electrons in solar flares. Analysis of solar flare gamma-ray data has shown: (i) ion acceleration is a major consequence of flare energy release, as the total flare energy in accelerated particles appears to be equipartitioned between greater than about 1 MeV/nucleon ions and greater than 20 keV electrons and amounts to an important fraction of the total energy release; (ii) there are flares for which over 50% of the energy is in α particles and heavier ions; (iii) in both impulsive and gradual flares, the particles that interact at the Sun and produce gamma rays are always accelerated by the same mechanism that operates in impulsive flares, probably stochastic acceleration through gyroreso- gyroresonant wave particle interaction; (iv) gamma-ray spectroscopy can provide new information on solar abundances, for example the site of the FIP bias onset and the photospheric He-3 abundance. We propose a new technique for the investigation of mass motion and mixing in the solar atmosphere, the observatio- observations of gamma-ray lines from long term radioactivity produced by flare accelerated particles.

Authors: Reuven Ramaty and Natalie Mandzhavidze
Projects:

Publication Status: In press, Highly Energetic Physical Processes and Mechanisms in Astrophysical Plasmas, IAU, P.C.H. Martens and S.Tsuruta, eds.
Last Modified: 1999-11-04 17:05
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