Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b2006y&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH31B-2006
Astronomy and Astrophysics
Astrophysics
[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7554] Solar Physics, Astrophysics, And Astronomy / X-Rays, Gamma Rays, And Neutrinos
Scientific paper
Small flares have been identified mainly through X-ray data and have been shown to be prodigious during solar maximum periods (~1000/year during solar maximum). Current instruments capable of high-energy gamma-ray observations operate above the sensitivity threshold for observing gamma-ray emission from small flares (C-class and smaller). COMPtonTELescope (COMPTEL) on the Compton Gamma-Ray Observatory (CGRO) is not only sensitive to small C-class flares (well below that of Solar Maximum Mission (SMM)) but also registered unambiguous 2.2 MeV nuclear-line emission, suggesting the presence of an accelerated ion population. In response to a BACODINE cosmic gamma-ray burst alert, COMPTEL on the CGRO recorded gamma rays above 1 MeV from the C4 flare at 0221 UT 20 January 2000. This event, though at the limits of COMPTEL's sensitivity, clearly shows a nuclear line excess above the continuum. Using new spectroscopy techniques we were able to resolve individual lines. We compare this C-class event with the gamma-ray line (GRL) flare distribution SMM and from Ramaty High Energy Spectroscopic Imager (RHESSI) as well as with the well-observed large "standard" GRL flare observed by Oriented Scintillation Spectrometer Experiment (OSSE) aboard CGRO.
de Nolfo Georgia Adair
Ryan Michael J.
Young Carolynn
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