Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.1807r&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #18.07; Bulletin of the American Astronomical Society, Vol. 28, p.1298
Astronomy and Astrophysics
Astronomy
Scientific paper
In June 1991 the Sun produced a series of six X-class flares. For the flare event on 15 June 1991 there exists a rich set of observations, including optical (H_α from Big Bear Observatory and Warsaw Observatory), radio and microwave emission from various stations, soft and hard X-rays (GOES, BATSE/CGRO) and gamma-rays (COMPTEL/CGRO and GAMMA-1). Also particle measurements of neutrons (COMPTEL) and interplanatary protons (neutron monitor network) have been obtained. We review these observations and we are able to obtain a composite photon spectrum spanning the energy range from about 25 keV to 4 GeV. As different features in the gamma-ray spectrum are sensitive to different energies of the accelerated proton spectrum, we can probe this proton spectrum from about 10 MeV to a few hundred MeV, showing that the measurements are consistent with a E(-3.5) spectrum. Extended emission in gamma-rays can be measured for several hours after the impulsive phase by both COMPTEL (nuclear de-excitation lines and neutron capture line at 2.2 MeV) and GAMMA-1 (>50 MeV gamma-rays from pion decay). Within the statistical uncertainties, both instruments measure the same time behaviour, which can be described by a double exponential decay. This similarity of different energy regimes indicates that continued acceleration of particles dominates over particle trapping during the extended phase.
Bennett Kevin
Debrunner Hermann
Kocharov Leon
Kovaltsov Gennadi
Lockwood Jeff
No associations
LandOfFree
The Solar Flare Event on 15 June 1991 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Solar Flare Event on 15 June 1991, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Solar Flare Event on 15 June 1991 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-815273