Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.5409s&link_type=abstract
American Astronomical Society Meeting 204, #54.09; Bulletin of the American Astronomical Society, Vol. 36, p.759
Astronomy and Astrophysics
Astronomy
Scientific paper
Previous studies have shown that hard X-ray flares often have both small scale ( ˜ 3-10'') and large-scale ( ˜ 20-5'') components. The large-scale sources have low surface brightness, but total flux on the order of 1/4 to 1/2 of the small-scale sources, so they cannot be directly imaged by the standard methods (Back-projection, Clean, MEM, or Pixons). The earlier studies assumed that the sources were circularly symmetric, which may have been true for the compact sources, but is not generally true for large-scale sources, such as those produced by albedo. However, by using in-phase superposition of RHESSI's rotational modulation profiles over many rotations ("STACKING"), we can obtain high S/N Fourier amplitudes and phases as functions of wavenumber and energy. The amplitudes, plotted as a function of roll angle, can provide evidence for modulation caused by large-scale, asymmetric sources. We can invert the Fourier amplitudes back to the image plane to determine the 2-D spatial scales as functions of time ( ˜ 1 min) and energy (10-50 keV). We will show these results and discuss their implications regarding the fluxes and shapes of albedo patches.
Hurford Gordon J.
Rhessi Team
Schmahl Ed. J.
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