Distribution of Photospheric Current Helicity

Details Distribution of Photospheric Current Helicity Distribution of Photospheric Current Helicity

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc..107z&link_type=abstract

Solar Physics with Radio Observations, Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan, Oct. 27-30, 1998, Edited

Physics

Scientific paper

In this paper, we analyze the current helicity parameter B∥ċ(\bigtriangledown × B)∥ of active regions, which is inferred from vector magnetograms. It is found that most of the active regions in the northern hemisphere have negative helicity and those in the southern hemisphere have positive helicity. Only less than 20% of active regions have the sign of helicity opposite to that of the majority sign in the same hemisphere. These active regions with reversed signs of helicity normally occur at some specific heliographic longitudes over long time periods.

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