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The helicity, induced electric field and Poynting flux of AR 11158and their relationship with the X-class flare

Published online by Cambridge University Press:  18 July 2013

Jihong Liu ,
Jiangtao Su  and
Hongqi Zhang
Jihong Liu
Affiliation:
Shijiazhuang University, Shijiazhuang, 050035, China. email: [email protected] Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, 650011, China
Jiangtao Su
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China. email: [email protected], [email protected]
Hongqi Zhang
Affiliation:
Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China. email: [email protected], [email protected]
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Abstract

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With the photospheric vector magnetic fields provided by SDO/HMI team, the helicity accumulation, induced electric field and Poynting flux is calculated for AR 11158 by using the local correlation tracking technique (LCT). It is found that the helicity accumulation reaches 6000×1040Mx2, the average densities of the induced electric field about 0.15-0.35 V cm−1, and that of the Poynting flux about 50-240 W m−2, within 50 hours. One main flare of X2.2 occurs in the increasing phase of the helicity accumulation, which also corresponds to the decreasing phase of the induced electric field and the gradual change phase of the Poynting flux. Before the flare, all these quantities increase rapidly for about 20 hours firstly, then increase gradually or even decrease for 8-9 hours.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 535 - 536
Copyright
Copyright © International Astronomical Union 2013 

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