Results 121 to 130 of about 10,821 (160)

Metrology of total solar irradiance monitoring

Advances in Space Research, 1999
Abstract The continuous observation of the solar irradiance at the highest possible precision and accuracy is an important objective of the earth climate change program. This requires: high quality metrology in the space environment, ground solar radiometric comparisons and laboratory characterisation activities. These different aspects are reviewed.
D. Crommelynck, S. Dewitte
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Total Solar Irradiance Observations

Surveys in Geophysics, 2011
The record of total solar irradiance (TSI) during the past 35 years has overlapping observations from space which can be merged to a composite, and three are available, namely the PMOD, the ACRIM and the IRMB composites. There are important differences between them, which are discussed in detail in order to find the best representation of solar ...
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Total solar irradiance and climate

Advances in Space Research, 2005
Abstract The solar radiation is the fundamental source of energy that drives the Earth’s climate and sustains life. The variability of this output certainly affects our planet. In the last two decades an enormous advance in the understanding of the variability of the solar irradiance has been achieved. Space-based measurements indicate that the total
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The Influence of Total Solar Irradiance on Climate

Space Science Reviews, 2000
To estimate the effect of the solar variability on the climate, two estimates of the solar intensity variations during the last three centuries have been used as forcing in numerical simulations. The model employed to carry out the experiments was the same coupled global ocean-atmosphere model used in a number of studies to assess the effect of the ...
U. Cubasch, R. Voss
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Surrogates for total solar irradiance

1994
Variations in the total solar irradiance as measured in space by ACRIM and ERB radiometers correlate well with a variety of ground-based activity indices such as sunspot number, 10-cm radio flux, and Ca K line intensity. These indices, in turn, correlate with the much longer geophysical records like that of radiocarbon in tree rings, and these time ...
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Evolutionary Characteristics of Total Solar Irradiance

Chinese Astronomy and Astrophysics, 2014
Abstract The significant periods of total solar irradiance are 35 d and 26 d in the 23rd and 24th solar activity cycles, respectively. It is inferred that the solar quasi-rotation periods are also 35 d and 26 d in the 23rd and 24th solar activity cycles, respectively.
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Solar radiometry: Total irradiance measurements

Advances in Space Research, 1982
Abstract The operating principles of modern absolute radiometers are discussed and the methods of their characterization, that is the accurate determination of the uncertainties, are described. In view of this analysis, the results of the solar constant determinations of the last 6 years are reviewed and an estimate of their uncertainties given ...
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Measurement of Total and Spectral Solar Irradiance

Space Science Reviews, 2006
The Sun’s electromagnetic radiation powers our solar system. In the case of the Earth it heats the lands and ocean, maintains our atmosphere, generates clouds, and cycles water. For other planets and minor bodies, similar and appropriate physical processes occur, also powered by the Sun.
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Sources of Solar Total Irradiance Variations

Solar Physics, 2009
The daily images and magnetograms acquired by MDI are a rich source of information about the contributions of different types of solar regions to variations in the total solar irradiance (TSI). These data have been used to determine the temporal variation of the MDI irradiance, the mean intensity of the solar disk in the continuum at 676.8 nm.
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Total Solar Irradiance Monitoring Programs

1998
Measurements of the total solar irradiance (TSI) during the last 18 years from satellites are reviewed and after correcting the ACRIM II to ACRIM I a composite TSI for the period from 1980-1996 is constructed. This time series is reliable for variability studies over time scales of up to the 11 year activity cycle and allows for example the comparison ...
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