Angular momentum transport by Reynolds stresses determined from the analysis of 100-year sunspot motions and its variations with solar cycle

Details Angular momentum transport by Reynolds stresses determined from the analysis of 100-year sunspot motions and its variations with solar cycle Angular momentum transport by Reynolds stresses determined from the analysis of 100-year sunspot motions and its variations with solar cycle

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..337p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 337-342.

Astronomy and Astrophysics

Astrophysics

14

Angular Momentum, Momentum Transfer, Reynolds Stress, Solar Cycles, Solar Rotation, Sunspots, Angular Velocity, Equations Of Motion, Power Spectra, Secular Variations

Scientific paper

Some aspects of the latitudinal momentum transport by Reynolds stresses, as deduced from the analysis of the Greenwich sunspot data for the period 1874-1976 by using only very young sunspot groups (age equal to or less than 3 d), were investigated in order to study the equatorial acceleration maintenance and its possible correlations with the equatorial angular velocity time variations and the solar cycle. The results, which are consistent with those of previous authors, indicate the presence of a net angular momentum flux toward the equator which is more vigorous at higher latitudes, and sufficient on average to maintain the observed equatorial acceleration. The angular momentum transport time variations show a significant periodicity correlated with the solar cycle. Also, the equatorial velocity time variations show significant periodicities, which in turn may depend on the angular momentum transport time variations. The scenario which emerges from these results is discussed in the framework of the theories of differential rotation and activity cycle.

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