Extended γ-ray emission in solar flares

Details Extended γ-ray emission in solar flares Extended γ-ray emission in solar flares

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..219r&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 219-224 (1996).

Physics

8

Solar Electromagnetic Emission

Scientific paper

During the solar flare events on 11 and 15 June 1991, COMPTEL measured extended emission in the neutron capture line for about 5 hours after the impulsive phase. The time profiles can be described by a double exponential decay with decay constants on the order of 10 min for the fast and 200 min for the slow component. Within the statistical uncertainty both flares show the same long-term behaviour. The spectrum during the extended phase is significantly harder than during the impulsive phase and pions are not produced in significant numbers before the beginning of the extended emission. Our results with the measurements of others allow us to rule out long-term trapping of particles in non-turbulent loops to explain the extended emission of these two flares and our data favour models based on continued acceleration.

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