Of Tilt and Twist

Details Of Tilt and Twist Of Tilt and Twist

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..135h&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

Using Haleakala Stokes Polarimeter active-region vector magnetograms and Mt. Wilson Observatory full-disk longitudinal magnetograms we measure both the overall twist (using the force-free-field parameter alpha) and tilt of 368 active regions. This dataset clearly shows two well-known phenomena Joy's law and the hemispheric helicity rule as well as a lesser-known twist-tilt relationship which is the point of this work. Those regions that closely follow Joy's law show no twist-tilt relationship as expected if the twist originates from convective buffeting of initially untwisted and unwrithed flux tubes within the convection zone through the Sigma effect. Those regions that strongly depart from Joy's law show significantly larger than average twist and a very strong twist-tilt relationship. These properties suggest that the twist-tilt relationship in these regions is due to kinking of flux tubes that are initially highly twisted but not strongly writhed perhaps as a result of dynamo action.

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