Rotation rates of small magnetic features from two- and one-dimensional cross-correlation analyses

Details Rotation rates of small magnetic features from two- and one-dimensional cross-correlation analyses Rotation rates of small magnetic features from two- and one-dimensional cross-correlation analyses

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145....1k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 145, no. 1, p. 1-10.

Physics

48

Cross Correlation, Solar Magnetic Field, Solar Rotation, Magnetic Signatures, Maxima, Minima, Solar Cycles

Scientific paper

Results of an analysis of 628 high-resolution magnetograms taken daily with the NSO Vacuum Telescope on Kitt Peak from 1975 to 1991 are presented. Motions in longitude on the solar surface are determined by a 2D cross-correlation analysis of consecutive day pairs. The measured rotation rate of small magnetic features, i.e., excluding active regions, is in excellent agreement with the results of the previous 1D analysis of the same data by Komm et al. (1993). The polynomial fits exhibit magnetic torsional oscillations, i.e., a more rigid rotation during cycle maximum and a more differential rotation during cycle minimum, but with smaller amplitudes than the 1D analysis.

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