Recurrence of solar activity - Evidence for active longitudes

Details Recurrence of solar activity - Evidence for active longitudes Recurrence of solar activity - Evidence for active longitudes

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...76..155b&link_type=abstract

Solar Physics, vol. 76, Feb. 1982, p. 155-165.

Physics

63

Solar Activity, Solar Rotation, Sunspot Cycle, Angular Velocity, Autocorrelation, Longitude, Power Spectra, Variability

Scientific paper

It is pointed out that the autocorrelation coefficients of the daily Wolf sunspot numbers over a period of 128 years reveal a number of interesting features of the variability of solar activity. Besides establishing periodicities for the solar rotation, solar activity cycle, and, perhaps, the 'Gleissberg Cycle', they suggest that active longitudes do exist, but with much greater strength and persistence in some solar cycles than in others. Evidence is adduced for a variation in the solar rotation period, as measured by sunspot number, of as much as two days between different solar cycles.

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