Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk12005s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
We summarize recent developments in our understanding of solar flares based primarily on gamma-ray line measurements made over the past twenty years with instruments having moderate spectral resolution. These measurements have provided information on solar ambient abundance, density, and temperature; accelerated particle composition, spectra, and transport; and flare energetics. Discoveries include: low FIP/high FIP enhancement in the ambient plasma where flare-accelerated particles interact; a highly variable ion to electron ratio during flares and from flare-to-flare; energies in flare-accelerated ions that are comparable to those in electrons; concentration of ^3He in flare-accelerated particles enhanced >1000 over its photospheric value; an accelerated α/p ratio of ~0.5 in flares; temperature and density measurements from the positronium fraction and broadened 511 keV line; red shifts in gamma-ray lines providing information on the directionality of interacting protons and α-particles measurement of the spectrum of broadened gamma-ray lines emitted by accelerated heavy ions that indicates Fe enhancements consistent with those observed in solar energetic particles.
Murphy Ronald
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