Magnetic and current helicities in solar dynamos

Magnetic and current helicities in solar dynamos

Current helicity data for solar active region provide the unique observational information for so-called α-effect which plays a key role in astrophysical dynamos producing large-scale magnetic fields of celestial bodies. We discuss problems arising in comparison between helicity data and predictions...

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Veröffentlicht in:Advances in space research 2007, Vol.39 (11), p.1670-1673
Hauptverfasser: Sokoloff, Dmitry, Zhang, Hongqi, Kuzanyan, Kirill M., Tomin, Dmitry
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Sun: magnetic fields
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container_end_page 1673
container_issue 11
container_start_page 1670
container_title Advances in space research
container_volume 39
creator Sokoloff, Dmitry
Zhang, Hongqi
Kuzanyan, Kirill M.
Tomin, Dmitry
description Current helicity data for solar active region provide the unique observational information for so-called α-effect which plays a key role in astrophysical dynamos producing large-scale magnetic fields of celestial bodies. We discuss problems arising in comparison between helicity data and predictions of solar dynamo theory. In particular, a significant excess of active regions with the “wrong” sign of helicity is seen to occur just at the beginning of the 11-year solar cycle. We attribute the excess partially to additional current helicity production from the twisting of rising magnetic flux tubes. We demonstrate that the excess is much less pronounced in the twist data. Future perspectives of helicity observations are discussed.
doi_str_mv 10.1016/j.asr.2006.12.015
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source ScienceDirect Journals (5 years ago - present)
subjects Sun: magnetic fields
title Magnetic and current helicities in solar dynamos
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