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Inferred flows of electric currents in solar active regionsTechniques to identify sources of major current systems in active regions and their channels of flow are explored. Measured photospheric vector magnetic fields together with high resolution white light and H-alpha photographs provide the data base to derive the current systems in the photosphere and chromosphere of a solar active region. Simple mathematical constructions of active region fields and currents are used to interpret these data under the assumptions that the fields in the lower atmosphere (below 200 km) may not be force free but those in the chromosphere and higher are. The results obtained for the complex active region AR 2372 are: (1) Spots exhibiting significant spiral structure in the penumbral filaments were the source of vertical currents at the photospheric surface; (2) Magnetic neutral lines where the transverse magnetic field was strongly sheared were channels along which a strong current system flowed; (3) The inferred current systems produced a neutral sheet and oppositely-flowing currents in the area of the magnetic delta configuration that was the site of flaring.
Document ID
19850021587
Document Type
Conference Paper
Authors
Ding, Y. J. (Academia Sinica Kunming, United States)
Hong, Q. F. (Academia Sinica Kunming Huntsville, AL, United States)
Hagyard, M. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Deloach, A. C. (NASA Marshall Space Flight Center)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: Meas. of Solar Vector Magnetic Fields
Subject Category
SOLAR PHYSICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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