On the Dynamic Disconnection of Rising Omega Loops

Details On the Dynamic Disconnection of Rising Omega Loops On the Dynamic Disconnection of Rising Omega Loops

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..220...43t&link_type=abstract

Solar Physics, Volume 220, Issue 1, pp.43-59

Physics

3

Scientific paper

The tilt-angle variation of solar bipolar magnetic regions (BMRs) in space and time is a probable indicator of large-scale properties of magnetic field distribution, the dynamo and other different processes affecting the rising of magnetic flux tubes. We analyze the tilt-angle distribution and evolution of clearly oriented BMRs using sunspot position and area measurements from the Greenwich Photo-Heliographic Results (GPHR) supplemented by high-quality full-disk sunspot drawings made in the Haynald Observatory in Hungary. Our work is made on the basis of the 14th sunspot cycle and we compare our results with present theories of magnetic flux evolution in the convective zone. Our results support the assumption that the scatter of tilt angles of BMRs around Joy`s law is determined by the convective turbulence. Furthermore, we find that regular BMRs grouped by age generally do not show the phenomenon of toroidal relaxation towards the east west direction. We interpret this by the disconnection of Ω-loops from the bottom of the convection zone.

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