Energetics of Electron and Ion Acceleration in RHESSI Flares

Details Energetics of Electron and Ion Acceleration in RHESSI Flares Energetics of Electron and Ion Acceleration in RHESSI Flares

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh12a..03s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH12A-03

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7514 Energetic Particles (2114), 7519 Flares, 7554 X-Rays, Gamma Rays, And Neutrinos

Scientific paper

The Reuven Ramaty High-Energy Solar Spectroscopic Imager ( RHESSI) has observed both high-energy electron bremsstrahlung emission and nuclear gamma-ray line emission from solar flares. The gamma-ray lines are produced when energetic ions interact with the ambient medium through various processes including neutron capture and nuclear de-excitation. By comparing electron-related emission and ion-related emission in flares, one can put constraints on the acceleration mechanism for electrons and ions. Of the gamma-ray lines, RHESSI is most sensitive to the neutron-capture line at 2.223 MeV, which is indirectly produced by protons accelerated above 30 MeV. RHESSI has observed eleven flares with significant neutron-capture line emission and can place upper limits on other flares. We compare the fluence in this line with the electron bremsstrahlung fluence above 300 keV for all RHESSI flares that extend to such energies and find strong evidence for a linear correlation between these two quantities. This correlation implies that the mechanism that accelerates protons above 30 MeV is directly associated with the mechanism that accelerates electons above 300 keV. We also look for correlations between these types of emission and soft X-ray emission as defined by GOES class. Finally, we compare these flares with flares observed in the past by the Solar Maximum Mission ( SMM) satellite. The work at the University of California, Berkeley, was supported by NASA contract NAS 5-98033.

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