Structural development of the X-ray limb flare of 30 April 1980 |
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Authors: | C. de Jager P. Hoyng H. Lafleur A. Schadee Z. Svestka H. F. van Beek W. van Tend |
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Affiliation: | The Astronomical Institute at Utrecht, Utrecht, The Netherlands;Space Research Department, University of Birmingham, UK |
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Abstract: | We describe the development of the limb flare of 30 April 1980, 20:20 UT, as observed by the Hard X-ray Imaging Spectrometer (HXIS) aboard the Solar Maximum Mission (SMM). It consisted of a short-lived bright nucleus (FWHM < 10,000 km), just inside the Sun's limb; a longer lasting tongue, extending to a height of 30,000 km, and a more complicated feature, approximately situated at the Sun's limb. The tongue was a pre-existing magnetic structure that started emitting X-rays only a few seconds after the bright nucleus, and which had a slightly higher temperature than the nucleus; its X-ray emission may be caused by electrons escaped from the nucleus. |
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