Energetic proton spectra in the 11 June 1991 solar flare

Details Energetic proton spectra in the 11 June 1991 solar flare Energetic proton spectra in the 11 June 1991 solar flare

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..623y&link_type=abstract

GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 623-627 (2001).

Astronomy and Astrophysics

Astrophysics

Spectroscopy And Spectrophotometry, X- And Gamma-Ray Telescopes And Instrumentation, X-Ray And Gamma-Ray Spectrometers, Gamma-Ray

Scientific paper

The June 11, 1991 gamma-ray flare seen by the Compton Gamma-ray Observatory (CGRO) displays several features that make it a dynamic and rich event. It is a member of a class of long duration gamma-ray events with both 2.223 MeV and greater than 8 MeV emission for hours after the impulsive phase. It also contains an inter-phase between the impulsive and extended phases that presents a challenge to the standard gamma-ray line (GRL) flare picture. This phase has strong 2.223 MeV emission and relatively weak 4.44 MeV emission indicative of a very hard parent proton spectrum. However, this would indicate emission greater than 8 MeV, which is absent from this period. We present the application of new spectroscopy techniques to this phase of the flare in order to present a reasonable explanation for this seemly inconsistent picture. .

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