Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icrc....3...13r&link_type=abstract
IN: International Cosmic Ray Conference, 22nd, Dublin, Republic of Ireland, Aug. 11-23, 1991, Laboratory for High Energy Astroph
Astronomy and Astrophysics
Astrophysics
Energy Spectra, Solar Flares, Solar Spectra, Solar Wind, Imp, International Sun Earth Explorers, Satellite Observation, Spectrum Analysis
Scientific paper
A study of the energy spectra of ions from impulsive solar flares in the 0.1 to 100 MeV region is reported with data from the combined observations of experiments on the ISEE 3 and IMP 8 spacecraft. Most of the events studied are dominated by He, and these He spectra show a persistent steepening or break above about 10 MeV resulting in an increase in the power-law spectral indices from about 2 to about 3.5 or more. One event, dominated by protons, shows a clear maximum in the spectrum near 1 MeV. If the rollover in the spectrum below 1 MeV is interpreted as a consequence of matter traversal in the solar atmosphere, then the source of the acceleration would lie only about 800 km above the photosphere, well below the corona. An alternative interpretation is that trapping in the acceleration region directly causes a peak in the spectrum.
Reames Donald. V.
Richardson Ian G.
Wenzel Klaus-Peter
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