Gamma-ray And Hard X-ray Imaging Of The 20 January 2005 Solar Flare

Details Gamma-ray And Hard X-ray Imaging Of The 20 January 2005 Solar Flare Gamma-ray And Hard X-ray Imaging Of The 20 January 2005 Solar Flare

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2804h&link_type=abstract

American Astronomical Society, SPD meeting #37, #28.04; Bulletin of the American Astronomical Society, Vol. 38, p.255

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Gamma-ray imaging provides a direct indication of the spatial properties of accelerated ions near the Sun. We present the results of RHESSI gamma-ray imaging of the 20 January 2005 solar flare. While maps in the electron-bremsstrahlung dominated >250-500 keV band show two comparable sources coinciding with footpoints seen with TRACE, corresponding 35 arcsecond resolution images in the neutron-capture line at 2.223 MeV show the ion-generated source to be preferentially associated with just one of these two footpoints. This result is supported by imaging with 183 arcseconds resolution in four gamma-ray continuum bands between 600 keV and 8 MeV. The relative locations of their centroids show relative displacements that correlate with the relative contribution of electrons and ions at different energies. Comparison of the intensity of the imaged neutron-capture line image with the spatially integrated line intensity obtained spectroscopically is consistent with all of the neutron-capture line flux originating in a compact source (diameter <20 arcseconds). While shock-acceleration high in the corona might be expected to produce a large, diffuse source, the observed compact source indicates that the gamma-ray producing ions were flare-accelerated. These flare-integrated results are presented in the context of a hard X-ray movie showing the movement and time-evolution of the lectron-associated footpoints. This work has been supported by NASA under NAS5-98033.

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