Helicity of solar active regions

Hongqi Zhang*
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012

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Helicity is an important quantity to present the basic topological configuration of magnetic field in the solar atmosphere, which is transferred from the solar subatmosphere into the interplanetary space. In this paper, we present the observational magnetic helicity in solar active regions and corresponding questions.

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Keywords : Sun: activity – Sun: magnetic topology