Browsing by Subject "Power spectra"

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Analysis of Ca(+) K plage area for short period variation

Singh, J; Jain, S. K (Indian Academy of Sciences, 1989-12)

Observations of solar Ca(+) K daily plage area from 1951 to 1977 are analyzed to search for short-period (12-13 day) variations. The 27-day periodicity due to solar rotation modulation is found at all latitudes. Using an ...
Global modes constituting the solar magnetic cycle. I - Search for 'dispersion relations'

Gokhale, M. H; Javaraiah, J; Kutty, K. N; Varghese, B. A (Springer Netherlands, 1992-03)

The spherical-harmonic-Fourier (SHF) analysis of the sun's magnetic field inferred from the Greenwich sunspot data is refined and extended to include the full length (1874-1976) of the data on the magnetic tape provided ...
Sun as a star - Rotation rates from the CA K-index

Singh, J; Livingston, W. C (Kluwer Academic Publishers, 1987-09)

Daily measurements for 18 months made at Tucson of the Ca K-index in integrated sunlight have been used to derive solar rotation rates. Power spectral analysis shows that one can obtain a well defined value of solar rotation ...

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