Temperature Structure of Solar Flares Observed by the YOHKOH SXT

Astronomy and Astrophysics – Astronomy

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Scientific paper

Hot plasmas from several solar flares have been observed by the Soft X-ray Telescope (SXT) on board the Yohkoh satellite. For a sample of flares observed by the SXT with a variety of X-ray filters, we have calculated temperature and emission measures as functions of space and time. Initial results from this analysis show the following: (1) The flare plasmas range in temperarure from several million degrees K up to greater than 20 million degrees K, depending on the individual event; (2) The region with the higest temperature does not coincide with the brightest region. For example, for the flare of 15 November 1991 (2238 UT) the temperature was typically 8-9 million degrees K on the bright kernels, with temperatures of 15-25 million degrees K on the edges of the bright regions. The average temperature for the flare was approximately 10 million degrees K. A preliminary interpretation of these observational results in terms of the temperature and density structure inside a magnetic loop will be presented.

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