Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..145l&link_type=abstract
SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,
Astronomy and Astrophysics
Astrophysics
Scientific paper
Since now more than 25 years, are gathered solar diameter measurements obtained from ground-based observatories that can be used to detect any temporal variations (in phase or out of phase with the solar cycle) but also departures from the sphericity shown by latitudinal variations. This last feature seems know undoubtful by comparison of all available data sets. Moreover a space experiment, known as PICARD, a CNES microsatellite expected to be launched by mid-2007, will have as one of its main objectives the measurement of such latitudinal dependence. This mission is completed by a ground program composed of SODISM II, a replica of the space experiment, MISOLFA, a diurnal seeing monitor, and MIRESOL. The main goal of this last device is to study the contamination by spots and faculae at the limb, in order to sort diameters by classes of quiet or active Sun. At last, we will present a theory capable to explain the observed differential latitudinal distortions by means of the thermal wind effect.
Lefebvre Sandrine
Rozelot Jean-Pierre
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