Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...451l..83s&link_type=abstract
Astrophysical Journal Letters v.451, p.L83
Astronomy and Astrophysics
Astronomy
254
Magnetohydrodynamics: Mhd, Gamma Rays: Observations, Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
Masuda et al. found a hard X-ray source well above a soft X-ray loop in impulsive compact-loop flares near the limb. This indicates that main energy release is going on above the soft X-ray loop, and suggests magnetic reconnection occurring above the loop, similar to the classical model for two ribbon flares. If the reconnection hypothesis is correct, a hot plasma (or plasmoid) ejection is expected to be associated with these flares. Using the images taken by the soft X-ray telescope aboard Yohkoh, we searched for such plasma ejections in eight impulsive compact-loop flares near the limb, which are selected in an unbiased manner and include also the Masuda flare, 1992 January 13 flare. We found that all these flares were associated with X-ray plasma ejections high above the soft X-ray loop and the velocity of ejections is within the range of 50--400 km s-1. This result gives further support for magnetic reconnection hypothesis of these impulsive compact-loop flares.
Hara Hisayuki
Kosugi Taichi
Masuda Seiji
Ogawara Yoshiaki
Shibata Kazunari
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