Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh52a..07z&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH52A-07
Physics
7857 Stochastic Phenomena (3235, 3265, 4475)
Scientific paper
We present sunspot group (GT) and magnetic field (MT) tilts extracted from the Solar Feature Catalogues for the period of 1997-1999 and 2004-2005. We detected 21104 sunspot groups from which tilts were extracted from 12823. The average tilts were found to increase towards the solar activity maxima for MT: from 4.56 (1997) to 6.54 (1999) decerasing to 5.48(2004) and for GT from 2.83 (1997) to 5.11 (1999) and 1.87 (2004). In general, both magnetic and group tilts increase with heliolatitude according to Joy's law with some deviations for the lower and higher latitudes revealing also some periodicity. The separation of the opposite polarities also varies with the latitude for all the groups and for those passing through central meridian. The latitude variations of the ratio of measured tilt- to-separation in the presented data were fit by a linear function and the coefficients are presented.
Zharkov S.
Zharkova Valentin
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