Statistics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9214k&link_type=abstract
American Astronomical Society Meeting 210, #92.14; Bulletin of the American Astronomical Society, Vol. 39, p.210
Statistics
Scientific paper
Magnetic flux emerging from the Sun's interior carries information about the physical processes of magnetic field generation and transport in the convection zone. The current paradigm is that solar magnetic fields are generated in the tachocline region and emerge in the form of toroidal flux tubes forming bipolar active regions, and that because of the Coriolis force the flux tubes emerge with a particular tilt with respect to the equator, observationally known as Joy's law. In order to test this and other properties of emerging magnetic flux we have carried out a systematic study of all, more than 500, emerging active regions observed by SOHO/MDI during 1996-2006, using 96-min cadence full-disk MDI magnetograms. The results reveal new interesting properties of emerging magnetic flux.
In particular, they indicate that the initial tilt may be quite different from Joy's law, but that after emergence the polarities quickly rearrange themselves to better conform to this law, something that presents a challenge to current theoretical models. We investigate statistics of the emerging flux properties, their changes during the solar cycle and discuss implications for dynamo theories and models of magnetic flux emergence and formation of active regions.
Kosovichev Alexander G.
Stenflo Jan Olof
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