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• W2028207812 startingPage "19851" @default.
• W2028207812 abstract "The microwave flux of the Sun is responsive to the same conditions that produce magnetically structured radiation at visible and X ray wavelengths, and so the solar flux at high radio frequencies such as 2800 MHz (10.7 cm) has been used as a proxy for solar optical variations. We have previously found that the the microwave flux time series show spectral variations that provide useful proxy information for total irradiance, and we have extended our analysis of the daily solar fluxes from Toyokawa Observatory at 1000, 2000, 3750, and 9400 MHz, in addition to the Ottawa 2800-MHz flux, for the years 1980-1989. An essential ingredient in our analysis is the extraction of the rotationally-modulated microwave component, which differs from the “S component” as recently defined in the literature. The rotationally-modulated fraction of the emission contains a significant, often dominant, contribution from gyroresonance emission, whereas the S component, as defined by the excess above the cycle minimum level, usually does not. This allows us to distinguish plage-associated emission from spot-associated emission in the time series of microwave flux. We show that in combination, the microwave fluxes for 1000–9400 MHz, which span the spectral peak of spot-associated emission, provide a very good proxy for both the active cavity radiometer irradiance monitor (ACRIM) total irradiance and the sunspot-blocked component of the irradiance, even without optical sunspot observations. Over the 1984–1989 period, this proxy has a weighted correlation with ACRIM of 95%, and an RMS deviation from the total irradiance of 0.27 w/m², slightly better than the deviation (0.35 w/m²) found using optical data." @default.
• W2028207812 created "2016-06-24" @default.
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• W2028207812 date "1995-01-01" @default.
• W2028207812 modified "2023-10-03" @default.
• W2028207812 title "Microwave proxies for sunspot blocking and total irradiance" @default.
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• W2028207812 doi "https://doi.org/10.1029/95ja00677" @default.
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