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Signatures of Interchange Reconnection: STEREO, ACE and Hinode Observations Combined
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Deborah Baker Submitted: 2009-09-30 07:55
Combining STEREO, ACE and Hinode observations has presented an opportunity to follow a filament eruption and coronal mass ejection (CME) on the 17th of October 2007 from an active region (AR) inside a coronal hole (CH) into the heliosphere. This particular combination of `open' and closed magnetic topologies provides an ideal scenario for interchange reconnection to take place. With Hinode and STEREO data we were able to identify the emergence time and type of structure seen in the in-situ data four days later. On the 21st, ACE observed in-situ the passage of an ICME with `open' magnetic topology. The magnetic field configuration of the source, a mature AR located inside an equatorial CH, has important implications for the solar and interplanetary signatures of the eruption. We interpret the formation of an `anemone' structure of the erupting AR and the passage in-situ of the ICME being disconnected at one leg, as manifested by uni-directional suprathermal electron flux in the ICME, to be a direct result of interchange reconnection between closed loops of the CME originating from the AR and `open' field lines of the surrounding CH.
Authors: D. Baker, A. P. Rouillard, L. van Driel-Gesztelyi, P. Demoulin, L. K. Harra, B. Lavraud, J. A. Davies, A. Opitz, J. G. Luhmann, J. A. Sauvaud, A. B. Galvin
Projects: STEREO
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Publication Status: Annales Geophysicae (Accepted)
Last Modified: 2009-09-30 08:09
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Evidence for interchange reconnection between a coronal hole and an adjacent emerging flux region
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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
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Publication Status: Astronomische Nachrichten (in press)
Last Modified: 2007-04-27 10:26
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