Gamma-ray line measurements and ambient solar abundances

Details Gamma-ray line measurements and ambient solar abundances Gamma-ray line measurements and ambient solar abundances

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..162s&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 162-171 (1996).

Physics

6

Solar Electromagnetic Emission, Chromosphere

Scientific paper

We review measurements of ten narrow γ-ray lines in 19 X-class solar flares observed by the Solar Maximum Mission spectrometer from 1980 to 1989 (1) which showed that abundances of elements in the flare plasma are grouped with respect to their first ionization potentials (FIP), indicated that both the Ne/O and C/O line ratios are dependent on the spectral index of accelerated particles, and suggested that the range in low-FIP/high-FIP line ratios is similar to that in comparing coronal and photospheric compositions. We confirm this range in variability using the (Mg+Si+Fe)/Ne line ratio, which is not strongly dependent on the spectrum of accelerated ions. We also use measurements of the positronium continuum and annihilation line to show that γ-rays from flares with the lowest low-FIP to high-FIP ratios were produced deep in the chromosphere where the abundances should be close to photospheric.

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