Energetics of Accelerated Ions and Electrons in Flares

Details Energetics of Accelerated Ions and Electrons in Flares Energetics of Accelerated Ions and Electrons in Flares

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42a0773s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH42A-0773

Physics

7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos

Scientific paper

We have analyzed hard X-ray and gamma-ray emission from 176 solar flares observed from 1980 to 1989 by the Solar Maximum Mission HXRBS and GRS experiments. This joint analysis provides flare spectra from ~40 keV to 8.5 MeV. We compare the photon spectra integrated over the same time intervals by the two experiments. The agreement in most instances is good. We present the combined spectra for all of the flares. These combined spectra can be used to study the shape of the bremsstrahlung continuum and therefore the shape of the accelerated electron spectrum over a broad range in energy. We estimate the energy contained in accelerated electrons above cutoffs of 20 keV and 70 keV using the X-ray data obtained with the HXRBS experiment. These energies range from ~ 1028 to 1034 ergs for a cutoff of 20 keV and from ~ 1027 to 1032 ergs for a cutoff of 70 keV. The energy in accelerated ions can be estimated from the gamma-ray fluxes in nuclear lines. These lines are strong enough to individually determine the energy contained in ions for about 40 flares. We plan to sum gamma-ray spectra from the remaining flares, grouped by the energy contained in electrons, to reveal the weak nuclear lines and therefore to determine the average energy contained in ions in these groupings. This work expands on the study performed by Ramaty and Mandzhavize (2000) for 19 intense nuclear line flares where they concluded that energy is often equipartitioned between accelerated ions and electrons.

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