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Evolution of magnetic field corresponding to X-ray brightening events in coronal holes and quiet Sun

Published online by Cambridge University Press:  18 July 2013

Zhenghua Huang ,
Maria Madjarska ,
Gerry Doyle  and
Derek Lamb
Zhenghua Huang
Affiliation:
Armagh Observatory, College Hill, Armagh, BT61 9DG N.Ireland (email: zhu@arm.ac.uk)
Maria Madjarska
Affiliation:
Armagh Observatory, College Hill, Armagh, BT61 9DG N.Ireland (email: zhu@arm.ac.uk)
Gerry Doyle
Affiliation:
Armagh Observatory, College Hill, Armagh, BT61 9DG N.Ireland (email: zhu@arm.ac.uk)
Derek Lamb
Affiliation:
Dept. of Space Studies, Southwest Research Institute, Boulder CO, USA
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Abstract

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We study the magnetic field structure and evolution for 26 X-ray brightening events in coronal holes and quiet Sun regions, including bright points and jets. We found that all brightening events are associated with bipolar regions and caused by magnetic flux emergence followed by cancellation. The emission fluctuations seen in the X-ray bright points are associated with reoccurring magnetic cancellation in the footpoints. An X-ray jet presents similar magnetic behaviour in the footpoints but its magnetic flux cancellation rate is much higher than in the bright point. Comparing coronal holes and the quiet Sun, we do not find differences in their corresponding magnetic field behavior.

Keywords

Sun: corona – Sun: chromosphere – Sun: evolution – magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 155 - 156
Copyright
Copyright © International Astronomical Union 2013 

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