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Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..367a&link_type=abstract
Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc
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1
Scientific paper
We analyzed 141 solar flare dates that were observed with the Yohkoh soft and hard X-ray telescopes to investigate general characteristics of soft X-ray high-temperature regions above flare loops. Although existence of the high-temperature region was first reported by Masuda et al. (1994), it has been criticized by several authors because the soft X-ray intensity of that region is weak and because it is usually located near a relatively large intensity gradient. A careful analysis is required for a systematic research that reveals general characteristics of the region and roles in the flare energy release mechanism. We carefully estimated the electron temperature of a flare site with the filter ratio technique from the Yohkoh soft X-ray data under an isothermal approximation after correcting the spacecraft pointing jitter and scattered X-rays due to the mirror micro-roughness, both of which are causes of the criticism. We have still found the high-temperature regions of 15--35 million degrees above flare loops for 64 flares in 141 events. A single flare event had single/multiple high-temperature region of 1--3 times 104 km in size. The region appeared at the hard X-ray impulsive phase and its temperature reached a maximum before the soft X-ray peak time. The volume emission measure of the region was 1047--48 cm3, which was about ten times smaller than that of 10 million degree flare loops beneath. The high-temperature regions tended to move outwards at a speed of 10--20 km s-1, which was systematically faster than the rising speed of flare loops of 4--6 km s-1. When the high-temperature regions were located in asymmetrical point to the two footpoints of flare loop, the regions were located at the side of a weaker hard X-ray source measured with the Yohkoh hard X-ray telescope, showing that the high-temperature regions appear at the side of a footpoint with a weaker magnetic field than the other.
Akiyama Sanae
Hara Hisayuki
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