Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20..483g&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 20, Issue 3, pp.483-490
Astronomy and Astrophysics
Astronomy
Sun, Radius, Irradiance, Quadrupole Moment, Oblateness
Scientific paper
The main objectives of the space mission Picard, currently scheduled for the end of 2003 and under construction, are to measure simultaneously the solar diameter, differential rotation and its total irradiance (and according to the choice of the orbit, its gravity modes). A mission of seven years will permit the study of the temporal variabilities of these quantities over a half solar cycle and it will be possible to determine the multiple regressions along the magnetic cycle. In this paper, we emphasize the physical effects, namely magnetic, thermal, and gravitational, which may explain such relationships. Moreover, the study of the latitudinal variabilities of the diameter will be a test for our 'differential theory', which consists in determining the successive differential gravitational moments, in order to probe the solar interior.
Godier Stéphanie
Rozelot Jean-Pierre
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