Vector magnetic field measurement at Hualrou and helicity of active regions

被引：2

作者：

Zhang, M. ^{[1
]}

Deng, Y. Y. ^{[1
]}

Zhang, H. Q. ^{[1
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

ADVANCES IN SPACE RESEARCH | 2007年 / 39卷 / 11期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

Sun; magnetic field; magnetic helicity; flux emergence; dynamo;

D O I：

10.1016/j.asr.2007.03.044

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The Solar Magnetic Field Telescope (SMFT) at the Huairou Solar Observing Station of the National Astronomical Observatory has been obtaining photospheric vector magnetograms on a daily basis for more than 20 years. In this paper we first introduce our magnetograph and our data reduction routine. Then we focus on what we can learn from these vector magnetic field measurements about the magnetic non-potentiality of active regions. Derived physical quantities, such as shear angle, a value and current helicity, are good indicators of magnetic helicity. By studying values and evolutions of these physical quantities, we get a glimpse of the dynamo process in the solar interior. By examining the evolution of these quantities we can also learn what are the favorable conditions for coronal eruptions such as flares and coronal mass ejections. (c) 2007 COSPAR. Published by Elsevier Ltd. All rights reserved.

引用

页码：1741 / 1748

页数：8

共 33 条

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[2]

Ai G.-X., 1982, CHINESE ASTRON ASTR, V6, P129

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