Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13...89p&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
To fully understand the origin evolution and topology of solar magnetic fields one should comprehend their magnetic helicity. Observationally non-zero helicity reveals itself in the patterns of electric currents inside active regions super-/penumbral sunspot whirls the shape of coronal loops and the fine structure of chromospheric filaments. The patterns of helicity are present on different spatial scales ranging from several arc seconds to a size of a solar hemisphere. Some patterns may bear information about deep subphotospheric processes (e.g. dynamo turbulent convection). Other may originate at or near the photosphere. In this talk we will review the observations of magnetic and current helicity on the Sun. We will also discuss the different mechanisms operating at or near the photosphere and we will compare them with the observations.
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