Positron annihilation radiation from solar flares

Details Positron annihilation radiation from solar flares Positron annihilation radiation from solar flares

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101...15s&link_type=abstract

IN: Positron-electron pairs in astrophysics; Proceedings of the Workshop, Greenbelt, MD, January 6-8, 1983 (A85-31276 13-90). Ne

Astronomy and Astrophysics

Astrophysics

20

Positron Annihilation, Solar Flares, Fluence, Radioactive Decay, Solar Maximum Mission, Spectral Line Width, Time Dependence

Scientific paper

Positron-annihilation radiation has been observed from the June 21, 1980 and June 3, 1982 flares by the gamma-ray spectrometer on the Solar Maximum Mission satellite. The observed 0.511-MeV line fluences from the flares were 14.6 + or - 3.3 gamma/sq cm and 103 + or - 8 gamma/sq cm, respectively. Measurement of the line width establishes an upper limit to the temperature in the annihilation region of 3 x 10 to the 6th K. The time dependence of the 0.511-MeV line during the 1980 flare is consistent with the calculations of Ramaty et al. (1983) for positrons created in the decay of radioactive nuclei. The time dependence of the 0.511-MeV line for the 1982 flare is more complex and requires more detailed study.

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