The directivity of high-energy emission from solar flares - Solar Maximum Mission observations

Details The directivity of high-energy emission from solar flares - Solar Maximum Mission observations The directivity of high-energy emission from solar flares - Solar Maximum Mission observations

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322.1010v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 1010-1022. USAF-supported research.

Astronomy and Astrophysics

Astronomy

99

Gamma Ray Astronomy, Satellite Observation, Solar Flares, Spaceborne Astronomy, Angular Distribution, Directivity, Gamma Ray Spectrometers, Radiation Distribution, Solar Maximum Mission, Solar X-Rays

Scientific paper

The data base consisting of flares detected by the gamma-ray spectrometer (GRS) on board the Solar Maximum Mission (SMM) satellite is used to study the directivity of high-energy radiation. A number of observations are presented that, strongly indicate that the high-energy emission from flares is anisotropic. They are the following: (1) the fraction of events detected at energies above 300 keV near the limb is higher than is expected for isotropically emitting flares; (2) there is a statistically significant center-to-limb variation in the 300 keV to 1 MeV spectra of flares detected by the SMM GRS; (3) the 25-200 keV hard X-ray spectra measured during the impulsive phase by the SMM GRS show a center-to-limb variation; and (4) nearly all of the events detected at above 10 MeV are located near the limb.

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