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Self-cancellation of solar ephemeral regions observed by SDO

Published online by Cambridge University Press:  18 July 2013

Shuhong Yang ,
Jun Zhang ,
Ting Li  and
Yang Liu
Shuhong Yang
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: shuhongyang@nao.cas.cn
Jun Zhang
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: shuhongyang@nao.cas.cn
Ting Li
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: shuhongyang@nao.cas.cn
Yang Liu
Affiliation:
W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305-4085, USA email: yliu@sun.stanford.edu
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Abstract

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We study the ephemeral regions (ERs) in the quiet Sun observed by the Solar Dynamics Observatory, and find that they can be classified into two types: normal ERs (NERs) and self-cancelled ERs (SERs). We identify 2988 ERs among which there are 190 SERs, about 6.4% of the ERs. The total self-cancelled flux is 9.8% of the total ER flux. We suggest that the self-cancellation of SERs is caused by the submergence of magnetic loops connecting the dipolar patches, without magnetic energy release.

Keywords

Sun: activitySun: photosphereSun: surface magnetism
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 159 - 160
Copyright
Copyright © International Astronomical Union 2013 

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