Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf...61l&link_type=abstract
Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co
Other
Scientific paper
PICARD is a microsatellite scheduled for launch in 2005 for which the main objectives are: (i) simultaneous precise and absolute measurements of solar diameter, differential rotation, solar irradiance and its variability and (ii) detection of oscillation modes. As far as our own program is concerned, the study aims on the one hand to measure for the first time the ratio W (=dln(R)/dln(L)) and on the other hand to take into account of small variations of the solar diameter on peculiar features of solar physics: reservoirs of gravitational energy, General Relativity tests,...From an environmental angle, the mission will aim at a better qualification of the Sun-Earth relationships as well as a better understanding of the role of the Sun in terrestrial climate. Nowadays, the solar diameter is regularly measured from the ground, but these measurements are affected by the atmospheric conditions; thus it is essential to obtain high-resolution space measurements. The contemporaneous observation of diameter from orbit and from the ground will permit a better separation of intrinsic solar variations from those of earth atmospheric origin.
Lefebvre Sandrine
Rozelot Jean-Pierre
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