Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..101b&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
Over the past decade the measurement of magnetic and current helicity at the solar surface has attracted significant interest. There is now general consensus that the two helicities are negative in the north and positive in the south. On the other hand the tilt of bipolar regions in the clockwise direction in the north corresponds to a positive writhe helicity. In the south the tilt is counterclockwise corresponding to negative writhe helicity. These signs of writhe helicity which are thus apposite to the twist helicity measured as current helicity are also suggested by N-shaped sigmoids in the north and S-shaped sigmoids in the south. We interpret these as bi-helical magnetic field structures which have in the north negative magnetic helicity at smaller scales and positive magnetic helicity at the largest scales and oppositely in the south. This is also what is expected and required from dynamo theory in order that the dynamo cycle is able to reverse the entire field in a time as short as 11 years. The generation and evolution of bi-helical fields is studied using hydromagnetic turbulence simulations both for the convection zone and the solar wind.
Blackman Eric G.
Brandenburg Axel
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