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Transport of Magnetic Helicity and Dynamics of Solar Active Regions

Published online by Cambridge University Press:  30 March 2016

M. K. Georgoulis ,
B. J. LaBonte  and
D. M. Rust
M. K. Georgoulis
Affiliation:
The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, USA
B. J. LaBonte
Affiliation:
The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, USA
D. M. Rust
Affiliation:
The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, USA

Abstract

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We introduce a method to calculate the magnetic helicity density in a given active-region vector magnetogram, and a lower limit of it, based on a linear force-free (Iff) approximation. Moreover, we provide a lower limit of the total magnetic helicity in the active region (AR). A time series of magnetograms can be used to calculate the rate of helicity transport. The results can be then correlated with manifestations of the dynamical activity in ARs, such as flares and filament eruptions.

Information

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 117 - 118
Copyright
Copyright © Astronomical Society of Pacific 2005

References

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