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Evidence for interchange reconnection between a coronal hole and an adjacent emerging flux region View all abstracts by submitter

Deborah Baker   Submitted: 2007-04-27 10:26

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.

Authors: Baker, D., van Driel-Gesztelyi, L., Attrill, G.D.R.
Projects: SoHO-EIT,SoHO-MDI

Publication Status: Astronomische Nachrichten (in press)
Last Modified: 2007-04-27 10:26
Go to main E-Print page  MHD oscillations in solar and stellar coronae: Current results and perspectives  Coronal ''Wave'': a signature of the mechanism making CMEs large-scale in the low corona?  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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