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The solar cycles represented by the monthly averaged sunspot numbers show characteristic nonlinear manifestations: a) non-sinusoidal time dependence with shorter rising phases and longer declining phases of moderate and strong cycles; b) smoother minima than maxima. In addition, stronger solar cycles are shorter, as a rule. We have found the approximate empirical formula τ = 45W -12...
We report on observations of the solar luminosity variations in the Fe xii line (195 Å) over the period 1996–1999, which corresponds to the minimum and rising phase of the current 23rd solar cycle. The relatively or rather high temporal cadence and spatial resolution of the Extreme-ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) allowed a nearly continuous...
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