Electric Currents and Hard X-ray Images in the X Class Flare of November 15, 1991

Details Electric Currents and Hard X-ray Images in the X Class Flare of November 15, 1991 Electric Currents and Hard X-ray Images in the X Class Flare of November 15, 1991

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.3005m&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #30.05; Bulletin of the American Astronomical Society, Vol. 24, p.776

Physics

2

Scientific paper

We present co-aligned observations of hard x-rays observed with the Hard X-ray Telescope (HXT) on board the YOHKOH spacecraft and vertical electric currents derived from a vector magnetogram obtained at the Mees Solar Observatory, Haleakala, Hawaii. Previous work comparing the wings of the Hα line to vertical electric currents has suggested that electron precipitation in flares occurs at the edges of these currents. The Stark wings of Hα were interpreted as a signature of non-thermal electrons penetrating the relatively dense chromosphere and used as a proxy for direct observation of the non-thermal electrons. The hard X-rays used in this study provide a direct determination of the locations of the electron energy losses. In the X class flare of November 15, 1991, we find the same relation between hard X-ray emission and vertical electric currents as was found between Hα Stark wing emission and vertical currents: the hard x-ray emission occurs predominantly at the edges of the vertical current sites, and not spatially on top of these currents. Canfield, R. C., de La Beaujardiere, J., and Leka, K. D., in ``The Physics of Solar Flares", ed. Culhane and Jordan, The Royal Society, London, 1991 Canfield, R. C., Leka, K. D., and Wulser,J. P., in ``Flare Physics in Solar Activity Maximum 22", ed. Uchida, Canfield, Watanabe, and Hiei, Springer-Verlag, Berlin, 1991

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