RHESSI Hard X-ray Microflare Statistics

Details RHESSI Hard X-ray Microflare Statistics RHESSI Hard X-ray Microflare Statistics

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh22a0849c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH22A-0849

Physics

7509 Corona, 7519 Flares, 7554 X-Rays, Gamma Rays, And Neutrinos

Scientific paper

We present the first in-depth statistical survey of all X-ray microflares observed by RHESSI between March 2002 and March 2007, a total of 25,705 events. These microflares were found using a new flare-finding algorithm designed to search the 6--12~keV count rate when RHESSIs full sensitivity was available in order to find the smallest events. These microflares are small flares, from low GOES C Class to below A Class (background subtracted) and associated with active regions. Each microflare is automatically analyzed at the peak time of the 6--12~keV emission. Spectral parameters are determined both by considering ratios between energy channels and by forward fitting a thermal plus non-thermal model. Flare images are created using back-projection and centroids and by forward fitting the complex visibilities. The combination of imaging and spectral parameters allow for the first time analysis of the thermal and non-thermal energy at the peak time of these microflares.

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