New high resolution observations of the solar diameter from space and ground with the microsatellite program PICARD |
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Authors: | Luc Dam |
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Institution: | (1) Service d’Aéronomie du CNRS, 91371 Verrières-le-Buisson, France |
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Abstract: | The PICARD microsatellite mission will provide 2 to 6 years simultaneous measurements of the solar diameter, differential
rotation and solar constant to investigate the nature of their relations and variabilities. The 100 kg satellite has a 40
kg payload consisting of 3 instruments which will provide an absolute measure (better than 10 milliarcsec) of the diameter
and the solar shape, a measure of total solar irradiance, and UV and visible flux in selected wavelength bands. Now in Phase
B, PICARD is expected to be launched before mid-2003. The engineering model of the diameter telescope will be used on ground
simultaneously with the satellite to investigate the atmospheric bias and state on the possible accuracy of the ground measurements
carried up to now. We review the scientific goals linked to the diameter measurement, present the payload, and give a brief
overview of the program aspects. |
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Keywords: | Solar diameter solar shape long-period oscillations g-modes solar influence on climate |
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