Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh21b..01a&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH21B-01
Physics
7511 Coronal Holes, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835)
Scientific paper
The recent observations from XRT on Hinode show dramatically that coronal hole are populated with intense X-ray jets that can reach heights of solar radii. These jets appear to originate from closed magnetic-field regions inside the holes; consequently, a natural explanation for these jets is that they are due to interchange reconnection between the open field of the hole and the closed field of an embedded bipole. This type of interchange reconnection has long been postulated as the driver, not only of coronal jets, but also for the solar wind itself. We argue, however, that the explosive nature of the jets imposes severe requirements on the reconnection that are not easily satisfied by realistic 3D models. In particular, the reconnection must have a "switch-on" nature in that it stays off until a substantial store of free energy has been accumulated, but then turns on abruptly and stays on until much of this free energy is released. We discuss the possible magnetic topologies of an embedded bipole in an open field region and present recent 3D simulations of a model in which interchange reconnection does, indeed, yield a large burst of energy release. We also discuss the implications of these results for the Hinode observations. This work was supported, in part, by NASA, ONR, and the NSF.
Antiochos Spiro K.
DeVore C.
Pariat Etienne
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