Speaker
Dr
Gerald Share
(University of Maryland)
Description
Fermi LAT has observed >100 MeV emission from at least twenty-five events following impulsive flares with GOES X-ray classes from M1.5 to X5.4. The emission is consistent with pion-decay radiation produced by > 300 MeV protons. Almost all the events are associated with fast (>800 km/s) CMEs, SEPs, and impulsive hard X-ray emission >100 keV. We discuss the time profiles of the LAT events on minute- and hour-long scales and information derived from a four-year systematic study of 95 energetic solar events and their association with sustained >100 MeV emission. We also discuss spectroscopic studies of the impulsive flares and sustained-emission phases that provide information on the numbers of >500 MeV protons and their spectra at the Sun and compare these properties with those observed in SEPs. This work was supported by the NSF-SHINE and NASA-Fermi-GI programs.
Author
Dr
Gerald Share
(University of Maryland)
Co-authors
Dr
Allan Tylka
(none)
Ms
Anne K. Tolbert
(Catholic University)
Dr
Brian Dennis
(NASA-GSFC)
Dr
Richard Schwartz
(Catholic University)
Dr
Ronald Murphy
(Naval Research Lab)
Dr
Stephen White
(Kirtland AFB)
