A Search for Discrete Changes in Coronal Hole Boundaries

Details A Search for Discrete Changes in Coronal Hole Boundaries A Search for Discrete Changes in Coronal Hole Boundaries

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh51c05k&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH51C-05

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7511 Coronal Holes, 7524 Magnetic Fields, 7554 X Rays, Gamma Rays, And Neutrinos

Scientific paper

Coronal hole boundaries separate the large-scale open and closed magnetic fields of the solar corona. Mid-latitude coronal holes often last for several rotations, maintain their structure and rotate more slowly than photospheric magnetic structures such as active regions. Thus it is assumed that magnetic reconnection between open and closed field lines must occur at the boundaries of holes to maintain their shapes and rotation rates. We use Yohkoh SXT difference images to study the changes in coronal hole boundaries as long and short-lived holes cross the disk near central meridian. Specifically we are interested in learning whether the reconnection proceeds smoothly or in a stepwise fashion. We focus on the equatorial extensions of polar coronal holes observed in 1992 and in 2000. We use similar techniques to study the evolution of the boundaries of transient coronal holes.

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