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Discrete changes in solar coronal hole boundariesSequences of Skylab X-ray images near central meridian passages of a large solar coronal hole are used here to examine hole boundary changes with a time resolution of 90 min. It is found that X-ray bright points play a key role in both the expansion and contraction of the coronal hole. The size scale of the boundary changes is about 20,000 km, and the time scale is 3 hr or less. A scenario is suggested in which a large-scale closed magnetic field interacts with a bright point to effect a change in the hole boundary.
Document ID
19910026262
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kahler, S. W.
(Emmanuel College Boston, MA, United States)
Moses, D.
(American Science and Engineering, Inc. Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
October 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 362
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
91A10885
Funding Number(s)
CONTRACT_GRANT: F19628-87-K-0033
CONTRACT_GRANT: NAS5-25496
CONTRACT_GRANT: NAS5-31619
Distribution Limits
Public
Copyright
Other

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