Search Publications
Energy Release and Dissipation during Giant Solar Flares
Hurley, K.; Sommer, M.; Boer, M. +3 more
The Solar X-Ray/Cosmic Gamma-Ray Burst Experiment aboard Ulysses has observed 11 solar hard X-ray flares with effective peak counting rates greater than 4 × 105 counts s-1. We have estimated the energy dissipated during these "giant" flares (GOES class > X12). The flare on 1991 June 1, probably the largest flare of the pre…
Fine-Scale Filamentary Structure in Coronal Streamers
Bird, Michael K.; Woo, Richard; Armstrong, John W. +1 more
Doppler scintillation measurements of a coronal streamer lasting several solar rotations have been conducted by Ulysses in 1991 over a heliocentric distance range of 14--77 R0. By showing that the solar corona is filamentary, and that Doppler frequency is the radio counterpart of white-light eclipse pictures processed to enhance spatial gradients,…
Directivity and Its Energy Dependence in Solar Flare Energetic Emission
Li, Peng
We have studied 72 solar flares simultaneously observed by the Gamma-Ray Spectrometer (GRS, 0.3-1 MeV) and the Hard X-Ray Burst Spectrometer (HXRBS, 30-500 keV) on the Solar Maximum Mission (SMM). Using the spectral analysis results, we studied spectal and size distribution center-to-limb variations for both instruments. The GRS observations show …
The First Search for a Gamma-Ray Burst Quiescent Counterpart in the Extreme Ultraviolet with EUVE
Hurley, K.; Kouveliotou, C.; Li, P. +3 more
The opening of the extreme ultraviolet window by the Extreme Ultraviolet Explorer (EUVE) satellite has provided the unique opportunity to perform the first search for a quiescent gamma-ray burst counterpart at these wavelengths. Such emission might be expected if some bursts are related to nearby hot neutron stars or neutron stars with accretion d…
A Search for Stellar Flares in Gamma-Ray Bursts Observed by BATSE and ULYSSES
Hurley, K.; Fishman, G. J.; Kouveliotou, C. +2 more
We have searched for gamma-ray bursts during stellar flares using Ulysses and BATSE/CGRO data and for a correlation between flare star positions and burst positions. More than 3000 stellar flares have been identified optically, but neither BATSE nor Ulysses observed any gamma-ray bursts which could be attributed to them. Using the BATSE trigger th…