Abstract
The Solar Variations (SOVA) experiment aboard EURECA will measure the total and spectral irradiance of the Sun, and their variations. Aims of the experiment are: - to study the short term (hours to months) variations of the solar irradiance for the investigation of the mechanisms of energy redistribution in the convection zone, - to study periodic fluctuations, with periods between a few minutes and several hours, for helioseismology and, - to measure the absolute value of the solar constant to determine its long term variations when compared with previous and future measurements. Two absolute active cavity radiometers of different design will measure independently the value of the total solar irradiance, one relative radiometer will measure the variations of the total solar irradiance and five photometers will measure the variations of the spectral irradiance in 5-nm wide wavelength bands centred at 335, 480, 500, 546 and 865 nm. The European Retrievable Carrier (Eureca), is an ESA space platform that will be placed in orbit around the Earth by the NASA Shuttle in October 1991, and will be recovered after 6 months of operation.
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