Mathematics – Logic
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007an....328..773b&link_type=abstract
Astronomische Nachrichten, Vol.328, Issue 8, p.773
Mathematics
Logic
11
Sun: Activity, Sun: Corona, Sun: Magnetic Fields
Scientific paper
Coronal holes are regions of dominantly monopolar magnetic field on the Sun where the field is considered to be `open' towards interplanetary space. Magnetic bipoles emerging in proximity to a coronal hole boundary naturally interact with this surrounding "open" magnetic field. In the case of oppositely aligned polarities between the active region and the coronal hole, we expect interchange reconnection to take place, driven by the coronal expansion of the emerging bipole as well as occasional eruptive events. Using SOHO/EIT and SOHO/MDI data, we present observational evidence of such interchange reconnection by studying AR 10869 which emerged close to a coronal hole. We find closed loops forming between the active region and the coronal hole leading to the retreat of the hole. At the same time, on the far side of the active region, we see dimming of the corona which we interpret as a signature of field line `opening' there, as a consequence of a topological displacement of the `open' field lines of the coronal hole.
Attrill Gemma D. R.
Baker Daniel
van Driel-Gesztelyi Lidia
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