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The Longer Term Evolution of Magnetic Field and Mass Flow in a Decaying Active Region

Published online by Cambridge University Press:  12 April 2016

Hongqi Zhang
Affiliation:
Beijing Astronomical Observatory, Chinese Academy of Sciences, P. R.China
Guoxiang Ai
Affiliation:
Beijing Astronomical Observatory, Chinese Academy of Sciences, P. R.China
Haimin Wang
Affiliation:
Big Bear Solar Observatory, California Institute of Technology, U.S.A.
Harold Zirin
Affiliation:
Big Bear Solar Observatory, California Institute of Technology, U.S.A.
Alan Patterson
Affiliation:
Big Bear Solar Observatory, California Institute of Technology, U.S.A.

Extract

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During September 24-29, 1987, the longitudinal magnetic fields of a decaying active region (AR 4855) were observed almost continuously at Big Bear and Huairou Solar Observatories. The target consisted of an αp sunspot and surrounding enhanced network. We achieved a 75-hour coverage with 4 night-time gaps of six to eight hours. The images were then combined to made a continuous movie.

The BBSO Videomagnetograph (VMG) System was originally developed by Leighton and Smithson and has been improved in recent years (Zirin, 1985). This system has made it possible to study very weak photospheric magnetic structures.

Type
Part III Solar magnetism and large-scale flows
Copyright
Copyright © Springer-Verlag 1991

References

Ai, G.: 1987, Publications of Beijing Astronomical Observatory 9, 27 Google Scholar
Zirin, H.: 1986, Aust. J. Phys. 38, 961 CrossRefGoogle Scholar