Hourly to decadal time scale variations of the spectral and total “solar constant”
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The most significant solar spectral radiation bursts that occurred during more than twelve-years observation period at an high altitude station are analyzed. It is shown that the number and amplitudes of solar spectral bursts increase when the solar activity (SA) maximum is approaching. A plausible mechanism of short-term variations of extra-atmospheric solar spectral irradiance (ETSSI) is discussed. It appears that a burst of ETSSI arises when the Earth is sporadically irradiated by a strong flux of induced violet-blue high coming out of magnetic flux tubes in the active region (AR) of the Sun. We confirm earlier conclusions that on the time-scale of decades there is a close relationship between variations in the areas of faculae, the solar constant, and surface air temperature. On the basis of these results we suggest that at the end of the 1930s, when the Sun was very active, its effective output was about 0.4%, and the surface temperature in the Northern hemisphere about 0.4°C, higher than in the first decade of the 20th century.
KeywordsSolar Activity Magnetic Flux Flux Tube Spectral Radiation Spectral Irradiance
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