Large-scale dynamics and polarities of magnetic structures

Details Large-scale dynamics and polarities of magnetic structures Large-scale dynamics and polarities of magnetic structures

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437..303m&link_type=abstract

Astronomy and Astrophysics, Volume 437, Issue 1, July I 2005, pp.303-310

Astronomy and Astrophysics

Astrophysics

3

Sun: Magnetic Fields, Sun: Photosphere, Sun: Faculae, Plages

Scientific paper

A large data set of MDI magnetograms is studied in order to analyse the dependence of the global dynamics of magnetic structures on their polarity. Two complementary techniques (feature tracking and correlation tracking) are used to determine the differential rotation and meridional circulation. A faster rotation of leading polarity structures is found for active areas, while a faster rotation of following polarity structures is found for weak field areas. However the latter is found only when using correlation tracking: individual small features do not seem to exhibit any difference between leading and following polarities. From correlation tracking, the mixed polarity areas (with a low activity level) do rotate as the following polarity areas. Furthermore, the latter have a more poleward motion when the correlation tracking is used.

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