Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh23a1526s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH23A-1526
Astronomy and Astrophysics
Astrophysics
[7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7529] Solar Physics, Astrophysics, And Astronomy / Photosphere, [7554] Solar Physics, Astrophysics, And Astronomy / X-Rays, Gamma Rays, And Neutrinos
Scientific paper
The diffuse solar X-ray albedo flux, formed from primary-source 10-100 keV X-rays that back-scatter from the solar photosphere, represents a significant component of the observed X-ray flare flux. As such it both distorts the spectral interpretation of X-ray emission and offers a potentially powerful diagnostic of electrons accelerated in solar flares. Our study uses the unique capabilities of the Ramaty High Energy Spectroscopic Imager (RHESSI) to isolate this albedo component, determine its properties such as size, shape and centroid location as a function of energy. We have focused on single-component flares in the 12-30 keV range that appear within 45 degrees of disk center. We have obtained the X-ray visibilities of a number of such flares and applied Forward-Fitting techniques to determine the parameters of the primary component (position, flux, and size) and the albedo-related parameters (primary source height and albedo flux). We will discuss the application of these results to other studies of flare spectra and 3-dimensional models, and their importance for understanding electron acceleration and transport processes.
Hurford Gordon J.
Schmahl Ed. J.
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