Variations in the solar calcium K line 1976-1982

Chromospheric variability between 1976 and 1982 as evidenced in Ca II K line observations obtained at Sacramento Peak Observatory is reported. The data on solar variability are compared to similar data collected at Kitt Peak by White and Livingston (1981). The measurement of solar rotation as reflected in the K index was attempted. Partial success was achieved in this second objective, based on limited results in early 1977 and early 1981-1982. While there is good long term (about 6 months) correlation between the K line and the number of plages and sunspots during the rising phase of solar activity, the short term correlation (about 1 week) is poor.

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