Source temperature influence on γ-ray de-excitation lines from solar flares

Details Source temperature influence on γ-ray de-excitation lines from solar flares Source temperature influence on γ-ray de-excitation lines from solar flares

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..363t&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Solar Flares: Gamma Rays

Scientific paper

γ-ray spectra from solar flares exhibit enhanced line emission from certain species, particularly 20Ne at 1.634 MeV. The threshold for excitation by protons of this line is lower than for most other species. For this reason the enhanced emission is seen as an indicator of a steep energy spectrum for the accelerated protons. It has been suggested, however, that the observed intensity of this line could result from greater lifetimes of these protons in a coronal plasma of sufficiently high temperature. Our detailed calculations demonstrate that proper inclusion of these warm target effects may significantly influence deductions of proton energy distribution, and thus of total fast ion energy content, in flares where a coronal γ-ray source seems likely.

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