EAS Publications Series
- EAS Publications Series / Volume 55 / January 2012, pp 29-34
- © EAS, EDP Sciences 2012
- Published online by Cambridge University Press: 27 June 2012
- DOI: http://dx.doi.org/10.1051/eas/1255004 (About DOI)
Magnetic Field and Polarization Measurements and Theory
Evolution of coronal hole boundaries observed by SDO
4th French-Chinese Meeting on Solar Physics Understanding Solar Activity: Advances and Challenges, 4th French-Chinese, Nice, France.
S.H. Yanga1, J. Zhanga1 and T. Lia1
a1 Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China. e-mail: shuhongyang@nao.cas.cn
Abstract
With the observations from the Solar Dynamics Observatory, we investigate the boundary evolution of a coronal hole (CH). Small-scale solar activity (e.g., coronal jet) can lead to gradual change of CH boundaries (CHBs). Besides gradual change of CHBs, a quiet Sun region can change into a CH region on a large scale when magnetic fields in the photosphere evolve from mixed-polarities into one-polarity dominance. CH regions can also evolve into quiet regions on a large scale when the underlying photosphere becomes mixed-polarity fields from one-polarity dominated fields.
(Online publication June 27 2012)
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