Torsional oscillations of the sun during 1915-1990

Details Torsional oscillations of the sun during 1915-1990 Torsional oscillations of the sun during 1915-1990

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997azh....74..474m&link_type=abstract

Astronomicheskij Zhurnal, vol. 74, p. 474

Astronomy and Astrophysics

Astronomy

9

Solar Oscillations, Angular Momentum, H Alpha Line, Drift Rate, Solar Rotation, Solar Cycles

Scientific paper

The differential rotation of the large-scale magnetic field of the sun is investigated using H-alpha synoptic charts for latitudes from +45 to -45 deg for the period from 1915 to 1990. Walsh function expansions are used in the analysis. The latitude dependence of the mean differential rotational velocity is determined. Between 1915 and 1990, seven zones of rapid rotation and seven zones of slow rotation relative to the mean value are distinguished. These zones of anomalous rotation drift toward the equator from a latitude of 45 deg on a timescale of 2.5 to 8 years; the drift velocity varies cyclically from 2 to 6 m/s. A zone remains at a given latitude for between 4 and 6.5 years. The maximum equatorial-drift velocity was observed in 1935-1955, and preceded the solar magnetic activity maximum. More recently, from 1960 to 1990, the drift velocity did not exceed 3 m/s. The properties of torsional oscillations and their relation to the solar activity cycle are investigated.

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