Short term evolution of coronal hole boundaries
In an examination of the evolution of coronal hole boundaries on a time scale of similar to 1 day, it is found that 38% of all the boundaries of coronal holes observed near the central meridian passage during the Skylab period shifted in location by > 1 degrees heliocentric in similar to 1 day. O...
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Veröffentlicht in: | Solar physics 1978-01, Vol.57 (1), p.129-139 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In an examination of the evolution of coronal hole boundaries on a time scale of similar to 1 day, it is found that 38% of all the boundaries of coronal holes observed near the central meridian passage during the Skylab period shifted in location by > 1 degrees heliocentric in similar to 1 day. Of these boundary changes, 70% were on a scale less than or equal to 3 times the average supergranulation cell size; however, large-scale shifts in the boundary locations also occurred, which involved changes in the X-ray emission from these areas of the Sun. X-ray emitting structures on the borders of isolated and evolving holes were less clearly defined than those on the boundaries of well established, elongated holes. There were generally more changes in the boundaries of the most rapidly evolving holes, but no simple relationship between the amount of change and the rate of hole growth or decay. |
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ISSN: | 0038-0938 1573-093X |
DOI: | 10.1007/BF00152050 |