Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...340..277m&link_type=abstract
Astronomy and Astrophysics, v.340, p.277-286 (1998)
Astronomy and Astrophysics
Astrophysics
7
Sun: Activity, Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
It has been shown previously that the low ionization levels in the deep chromosphere of solar flares can cause the return current driven by a thick target electron beam to be unstable to ion aoustic wave generation, contrary to conventional wisdom. We investigate, using Yohkoh data, the possibility that anomalous heating as a result of this instability is capable of producing sufficient heating, in the right places at the right times, to account for the enhanced continuum emission actually observed in white-light flares. The Soft X-ray Telescope (SXT) onboard \it Yohkoh incorporates an aspect camera which, prior to its failure in 1992, provided white-light images at 431 nm with a bandpass of 3 nm. A number of white-light flares were observed during its operational lifetime for which there was coincident hard X-ray data from the Hard X-ray Telescope (HXT), providing suitable candidates for study. Four such events are discussed, and the model found to be viable.
Brown John C.
Matthews Sarah A.
van Driel-Gesztelyi Lidia
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