Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922406s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #224.06
Other
Scientific paper
In this paper, the role of evolving coronal holes in the occurrence of eruptive phenomena on the Sun has been studied. Using subtraction method and the H-alpha synoptic charts of Carrington rotations 1716 -1746, the parts of KPNO 10830 Å coronal holes that are formed and/or disappeared from one synoptic map to another have been identified and compared with the positions of evolutionary changes in polarity reversal boundaries, prominences and Unipolar Magnetic Regions (UMRs).
Our results show that:
1. Coronal holes are not entirely passive if they are evolving.
2. There exists a physical relationship of newborn coronal holes and/or "Newly Formed Coronal Hole Areas” (NFOCHAs) with the disappearance of three solar features, namely prominences, polarity reversal boundaries and/ or UMRs.
3. The newborn coronal holes and polar & low-latitude NFOCHAs emerge in the succeeding rotations at the locations that had been the positions of polarity reversal boundaries and prominences in the preceding rotations.
4. There are 124 cases of NFOCHAs that demonstrate their association with complete and partial disappearance of polarity reversal boundaries with or without prominences.
5. A newborn coronal hole of one polarity emerges in the aftermath of complete or partial disappearance of the UMR of opposite polarity along with polarity reversal boundary circumscribing the UMR.
6. Most of the associated newborn coronal holes are long-lived and last for several solar rotations.
Our results demonstrate that the polarity reversal boundary erupts either by a mechanism that leads to the opening of pre-existing closed magnetic structures into a new coronal hole, which can support mass motion including an erupting prominence or alternately by some more fundamental process, which, under suitable conditions, can trigger the eruption of polarity reversal boundary with overlying quiescent prominence and also form a new coronal hole at the eruption site.
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