Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519..876z&link_type=abstract
The Astrophysical Journal, Volume 519, Issue 2, pp. 876-883.
Astronomy and Astrophysics
Astronomy
28
Magnetohydrodynamics: Mhd, Sun: Activity, Sun: Magnetic Fields, Sun: Photosphere
Scientific paper
In this paper, we describe the distribution of photospheric current helicity of active regions in the solar surface. The sign of helicity is mainly negative in the northern hemisphere of the Sun and positive in the southern hemisphere. We also discuss the relationship between the current helicity parameter B_||˙(∇XB)_|| and the alpha-factor of the force-free field. Our observations show that active regions with current helicity signs opposite to most others in the same hemispheres occur normally at some heliographic longitudes and persist over long periods.In addition, we analyze a possible mechanism of the sign rule of current helicity that shows opposite signs in both hemispheres.
Bao Shudong
Zhang Hongqi
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