NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Evidence for solar flare directivity from the Gamma-Ray Spectrometer aboard the SMM satelliteA number of observations from the SMM Gamma-Ray Spectrometer are presented that altogether strongly indicate that the high-energy emission from flares is anisotropic. They are: (1) the fraction of events detected at energies above 300 keV near the limb is significantly higher than is expected for isotropically emitting flares; (2) there is a statistically significant center-to-limb variation in the 300-1000-keV spectra of flares; and (3) nearly all of the events detected at above 10 MeV are located near the limb.
Document ID
19870052726
Document Type
Reprint (Version printed in journal)
Authors
Vestrand, W. T. (New Hampshire Univ. Durham, NH, United States)
Forrest, D. J. (New Hampshire Univ. Durham, NH, United States)
Chupp, E. L. (New Hampshire, University Durham, United States)
Rieger, E. (Max-Planck-Institut fuer extraterrestrische Physik Garching, Germany)
Share, G. H. (U.S. Navy, E. O. Hulburt Center for Space Research, Washington DC, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Advances in Space Research
Volume: 6
Issue: 6 19
ISSN: 0273-1177
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-720
CONTRACT_GRANT: NAS5-28609
CONTRACT_GRANT: NASA ORDER S-14513-D
CONTRACT_GRANT: BMFT-01-OK-017-ZA/WS/WRK-0275
Distribution Limits
Public
Copyright
Other