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Nonpotentiality and energy transport in NOAA AR 10720

Published online by Cambridge University Press:  01 November 2006

Meng Zhao  and
Jingxiu Wang
Meng Zhao
Affiliation:
National Astronomical Observatories, Chinese Academy of Science. 20A, Datun Rd. Chaoyang Dist, Beijing 100012, China email: zhaomeng@ourstar.bao.ac.cn, wjx@ourstar.bao.ac.cn
Jingxiu Wang
Affiliation:
National Astronomical Observatories, Chinese Academy of Science. 20A, Datun Rd. Chaoyang Dist, Beijing 100012, China email: zhaomeng@ourstar.bao.ac.cn, wjx@ourstar.bao.ac.cn
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Abstract

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Based on photospheric vector magnetograms obtained at Huairou Observing Station and BBSO, we studied the evolution of magnetic nonpotentiality and energy transport in NOAA AR 10720. Daily changes of vector magnetic field was analyzed. Shear angle, helicity and free energy density which were deduced from the data were examined.

A New EFR on January 13 brought in magnetic nonpotentiality strong shear angle, free energy and complexity(multiple neutral line and opposite sign helicity) which touched off AR activity, support the idea that upper atmospheres critical state may be made by continues changes on the photosphere.

Keywords

nonpotentialityvector magnetic fieldshear anglehelicityfree energy
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 41 - 44
Copyright
© 2006 International Astronomical Union