Observation of the Coronal Hard X-ray Sources of the 1998 April 23 Flare

Details Observation of the Coronal Hard X-ray Sources of the 1998 April 23 Flare Observation of the Coronal Hard X-ray Sources of the 1998 April 23 Flare

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...558l.137s&link_type=abstract

The Astrophysical Journal, Volume 558, Issue 2, pp. L137-L140.

Astronomy and Astrophysics

Astronomy

11

Plasmas, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

We analyzed Hard X-Ray Telescope observations of an X1.2 flare on 1998 April 23. This flare is one of the best examples for studying coronal hard X-ray sources due to the intensity of the emission and the occultation of the footpoints. In this flare, coronal hard X-ray sources composed of both thermal and nonthermal emissions showed complex structure unlike any previously observed. Dominant thermal and nonthermal sources do not come from the same loop-top region. Nonthermal sources include two sources in the low corona (~2.7×103 km) and an extended source in the high corona (~5×104 km). These observations of nonthermal coronal sources suggest that energetic phenomena occur in the low corona at first, and energized electrons are then injected into a high coronal region.

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