Coronal hole evolution by sudden large scale changes |
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| Authors: | Jerome T Nolte Michel Gerassimenko Allen S Krieger Craig V Solodyna |
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| Institution: | (1) American Science and Engineering, Inc., 955 Massachusetts Avenue, 02139 Cambridge, Mass., U.S.A. |
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| Abstract: | We have compared sudden shifts in coronal hole boundaries observed by the S-054 X-ray telescope on Skylab between May and November, 1973, within 1 day of CMP of the holes, at latitudes  40 °, with the long-term evolution of coronal hole area. We find that large-scale shifts in boundary locations can account for most if not all of the evolution of coronal holes. The temporal and spatial scales of these large-scale changes imply that they are the results of a physical process occurring in the corona. We conclude that coronal holes evolve by magnetic field lines opening when the holes are growing, and by fields closing as the holes shrink.Skylab Solar Workshop post-doctoral appointee 1975–1976. The Skylab Solar Workshops are sponsored by NASA and NSF and managed by the High Altitude Observatory, National Center for Atmospheric Research. |
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