Some basic questions on helicity inferred from vector magnetograms

Details Some basic questions on helicity inferred from vector magnetograms Some basic questions on helicity inferred from vector magnetograms

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009scchg..52.1749x&link_type=abstract

Science in China Series G: Physics, Mechanics and Astronomy, Volume 52, Issue 11, pp.1749-1753

Astronomy and Astrophysics

Astronomy

Photosphere, Magnetic Field, Helicity, Solar Dynamo

Scientific paper

This paper summarizes current helicity measurements in the solar active regions (ARs). There is a basic agreement with the “hemispheric sign rule (HSR)” of the current helicity among different vector magnetographs through two solar cycles, but there is a large dispersion of the fraction of ARs following the HSR. In our sample, there are 50%-78% ARs in solar cycle 22 and 44%-79% ARs in cycle 23 following the HSR. A variation is also found in the fraction of the ARs following the HSR between different instruments even when the same ARs are selected. The difference also exists for the same instrument when the selected ARs are different. There are some differences in the variation of HSR with solar cycle for the individual helicity parameter inferred from different instruments. Factors which influence the correlation of different data sets are analyzed.

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