Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.1401k&link_type=abstract
American Astronomical Society, SPD meeting #37, #14.01; Bulletin of the American Astronomical Society, Vol. 38, p.243
Astronomy and Astrophysics
Astronomy
Scientific paper
Solar coronal holes (CHs) are large regions of the corona magnetically open to interplanetary space. The presence of long-lived CHs rotating with nearly rigid north-south boundaries has been known since their discovery on Skylab. Those boundaries must be maintained while the underlying photosphere fields rotate differentially, so interchange magnetic reconnection is presumed to be continually occurring at the boundaries. The time and size scales of the required reconnection events have not been established from previous observations with soft X-ray images. We use TRACE 195 A observations of a long-lived CH on 9 December 2000 to look for boundary changes. That CH was an equatorial extension of the negative-polarity north polar CH. Boundary variations found in the TRACE images, taken with 5-minute time resolution, are compared to photospheric magnetograms obtained with the MDI instrument on SOHO. Extrapolated magnetic field changes over 6-hr intervals are used with a full spherical potential field model to look for coronal changes that can be compared with those found in the TRACE data.
de Luca E. E.
Jibben Patricia
Kahler Stephen W.
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