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Hard X-ray Spectrum of the Above-the-Looptop Source in Impulsive Solar Flares

Published online by Cambridge University Press:  25 May 2016

S. Masuda*
Affiliation:
Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa, Aichi 442-8507, Japan

Extended abstract

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The Hard X-ray Telescope (HXT: Kosugi et al. 1991) onboard Yohkoh has observed that, in impulsive solar flares, a hard X-ray source is located above the apex of a soft X-ray flaring loop, in addition to double footpoint sources (Masuda et al. 1994, 1995). This observation suggests that flare energy-release, probably magnetic reconnection, takes place not in the soft X-ray loop but above the loop. It is important to derive the hard X-ray spectrum of the above-the-looptop source accurately in order to understand how electrons are energized there. The above-the-looptop source was most clearly observed during the 13 January 1992 flare. However, the count rate, especially in the H-band (53–93 keV), is too small to synthesize high-quality images and to derive an accurate spectrum.

Type
Part II: Posters
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

Kosugi, T., et al. 1991, Solar Phys., 136, 17.Google Scholar
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Masuda, S., Kosugi, T., Hara, H., Tsuneta, S., & Ogawara, Y. 1994, Nature, 371, 495.Google Scholar