IIA Institutional Repository

Browsing by Subject "K lines"

Browsing by Subject "K lines"

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  • Chromospheric CA II K-line variations in the sun as a star over a solar cycle 
    Sivaraman, K. R; Singh, J; Bagare, S. P; Gupta, S. S (American Astronomical Society, 1987-02)
    The disk-averaged Ca II K profiles obtained at the Kodaikanal solar tower telescope for the period 1969-1984 are used to study the chromospheric variations in the sun as a star. The 1A index shows increases of 18 and 28 ...
  • Do polar faculae on the sun predict a sunspot cycle? 
    Makarov, V. I; Makarova, V. V; Sivaraman, K. R (Springer, 1989-03)
    The paper reports the results of the analysis of the data on polar faculae for three solar cycles (1960–1986) at the Kislovodsk Station of the Pulkovo Observatory and on polar bright points in Ca ii K line for two solar ...
  • 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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