Torsional oscillation patterns in photospheric magnetic features

Details Torsional oscillation patterns in photospheric magnetic features Torsional oscillation patterns in photospheric magnetic features

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..143...19k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 143, no. 1, p. 19-39.

Physics

59

Cross Correlation, Photosphere, Solar Magnetic Field, Solar Orbits, Solar Oscillations, Solar Rotation, Doppler Effect, Magnetic Flux, Magnetic Signatures, Solar Cycles

Scientific paper

An analysis of 689 high-resolution magnetograms taken daily with the NSO Vacuum Telescope on Kitt Peak from 1975 to 1991 is presented. Motions in longitude on the solar surface are determined by a 1D cross-correlation analysis of consecutive day pairs. The main sidereal rotation rate of small magnetic features is best fit by omega = 2.913 (+/- 0.004) - 0.405 (+/- 0.027) sin squared phi - 0.422 (+/- 0.030) sin exp 4 phi, in microrad/s, where phi is the latitude. Small features and the large-scale field pattern exhibit the same general cycle dependence; both show a torsional oscillation pattern. Alternating bands of faster and slower rotation travel from higher latitudes toward the equator during the solar cycle in such a way that the faster bands reach the equator at cycle minimum.

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