Coronal Hole Boundaries and their Interactions with Adjacent Regions |
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Authors: | L A Fisk T H Zurbuchen N A Schwadron |
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Institution: | (1) Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, USA |
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Abstract: | Coronal hole boundaries are the interfaces between regions where the coronal magnetic field contains a significant component
which is open into the heliosphere and regions where the field is primarily closed. It is pointed out that there are constraints
on the magnetic field which opens into the heliosphere that must be satisfied in the corona: it must come into pressure equilibrium
in the high corona, and the component of the field which connects to the polar regions of the Sun must differentially rotate.
A model is presented in which satisfying these constraints determines which field lines are open and which are closed, and
thus where the polar coronal hole boundaries occur. Some of the consequences of this model are discussed.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | coronal holes solar wind Ulysses |
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