Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-10-06
Astronomy and Astrophysics
Astrophysics
latex 4 pages, 2 eps figures (included). To appear in 'Encyclopedia for Astronomy' (MacMillan)
Scientific paper
We briefly review the theory of gamma ray production in solar flares and present the highlights of the observations and their implications. Specifically: (i) the gamma ray data show that a large fraction of the released flare energy is in accelerated ions, mostly around 1 MeV/nucleon; (ii) the accelerated He-3, heavy ion, and relativistic electron abundances are enriched, implying that the particle acceleration is dominated by stochastic gyroresonant interactions with plasma turbulence; (iii) there is evidence for the enhancement of the abundances of ambient chromospheric elements with low first ionization potentials; (iv) the observed Li-7 and Be-7 lines, at 0.429 MeV and 0.478 MeV due to alpha-alpha interactions, show that both the accelerated alpha particle and the ambient He abundances are significantly enhanced.
Mandzhavidze Natalie
Ramaty Reuven
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