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Solar constant
About: Solar constant is a research topic. Over the lifetime, 967 publications have been published within this topic receiving 29647 citations.
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TL;DR: Wang et al. as discussed by the authors proposed a strategy to select the best solar constant value for estimating the monthly average daily global solar radiation with the Angstrom-Prescott correlation, using the measured data between 1971 and 2000.
27 citations
TL;DR: In this paper, the authors used the Itapetinga Radio Observatory with the multibeam system to estimate the solar radius at 48 GHz and found that the observed solar radius decreases with the solar cycle.
Abstract: Maps of the whole Sun at 48 GHz made during the period 1991-1993, using the large dish of Itapetinga Radio Observatory with the multibeam system, allowed solar limb determinations with unprecedented precision From a large sample of maps, the solar radius at 48 GHz is found to vary in time The observations showed that there is an apparent decrease of the measured radius as the solar cycle declines We estimated the decrease to be 8'' for half of the solar cycle The 48 GHz solar radius variations are found to be very well correlated with the solar irradiance
27 citations
TL;DR: In this article, the authors used superposed epoch analysis to reveal the typical properties of these three event groups as well as their similarities and differences, and showed that sawtooth events are associated with the strongest ionospheric activity.
27 citations
TL;DR: In this paper, a strong inverse correlation is shown between the irradiance dips observed by the SMM/ACRIM radiometer and the projected areas of the active sunspots, and the results of a preliminary time series analysis indicate that the value of the solar constant decreased when quickly developing sunspot groups with complex structure occurred on the solar disk.
Abstract: A strong inverse correlation is shown between the irradiance dips observed by the SMM/ACRIM radiometer and the projected areas of the ‘active’ sunspots. This strong correlation and the results of a preliminary time series analysis indicate that the value of the solar constant decreased when quickly developing sunspot groups with complex structure occurred on the solar disk. On the other hand, when the old groups with simple structure were dominant the value of the solar constant increased slightly or these groups could reduce the effects of the ‘active’ spots. On the basis of our investigations it seems that the formation of the sunspots and the new activity of the older ones as well as the decreases of the solar constant may be the common symptoms of such a physical process which takes place in deeper regions of the Sun through the interaction of magnetic fields with the convection.
27 citations
TL;DR: In this article, the statistical performance of four correlations for estimating the monthly average daily horizontal global radiation was evaluated for 140 locations around the world with varied meteorological conditions and geographical locations.
27 citations