Dynamic behaviour of the K-corona above a type I radio source |
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Authors: | R A Duncan |
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Institution: | 1. High Altitude Observatory, 80307, Boulder, CO, USA 2. Division of Radiophysics, CSIRO, P.O. Box 76, 2121, Epping, NSW, Australia
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Abstract: | Coronagraph images can be greatly enhanced by subtracting from the brightness of each picture point, the running median brightness over a square surrounding each picture point. The application of this technique to coronal analysis appears to be new. After such enhancement, images recorded by the SMM Coronagraph/Polarimeter reveal a coronal transient with previously undescribed characteristics. The transient began with bright ejecta moving up pre-existing rays and weaker, more diffuse, mass injection in the area between rays. At the sudden onset of this mass ejection the rays began to move apart from one another: during the ensuing 22 hr the separation of one pair of rays increased by 37° of latitude. Towards the end of the event these moving rays looked much like the legs of previously described loop transients. A type I radio source lay close to the centre of symmetry of the transient. |
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