RHESSI Observations of the Motion of Coronal Hard X-Ray Source in 9 July 2002 Flare

Details RHESSI Observations of the Motion of Coronal Hard X-Ray Source in 9 July 2002 Flare RHESSI Observations of the Motion of Coronal Hard X-Ray Source in 9 July 2002 Flare

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0454k&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0454

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos

Scientific paper

The high energy spectroscopic imager aboard the RHESSI spacecraft images the Sun at photon energies from 3 keV to 15 MeV with high temporal, spectral and spatial resolution, and so is well suited to study the properties of energetic electrons in flares through the observations of the hard X-ray sources. Multi-spacecraft observations during the last solar cycle showed that flare-associated hard X-ray sources exist in the corona. Images of these sources were, however, not available. An opportunity to image a coronal source was provided by the 9 July 2002 (0905 UT) flare which apparently occurred in the Active region NOAA 0026 after it rotated off the west limb of the Sun. It is inferred that the flare was located about 12 degrees behind the west limb. Images of the 6-12 keV and 12-25 keV X-ray sources obtained by RHESSI during the early decay of the X-ray flare indicate that the height of the X-ray source above the photosphere increased from about 18500 km to 27000 km within a period of 10 minutes corresponding to an average speed of about 14 km/sec. Relationship of this motion to the overall flare process will be discussed.

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