PICARD: simultaneous measurements of the solar diameter, differential rotation, solar constant and their variations

Details PICARD: simultaneous measurements of the solar diameter, differential rotation, solar constant and their variations PICARD: simultaneous measurements of the solar diameter, differential rotation, solar constant and their variations

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..24..205d&link_type=abstract

Advances in Space Research, Volume 24, Issue 2, p. 205-214.

Computer Science

Performance

13

Scientific paper

PICARD is a CNES micro-satellite mission due for flight by the end of 2002, named after the name of a French astronomer who first observed with consistency the solar diameter changes during the Maunder minimum in the 16th century. It consists of two instruments measuring (i) the solar diameter and differential rotation, and (ii) the total solar irradiance. These quantities are fundamental for the understanding of the solar-Terrestrial relations, e.g. the influence of the Sun on the Earth's climate, and of the internal structure of the Sun. The continuous - or nearly continuous - viewing of the Sun from an appropriate orbit, the 5 minutes sampling rate and the very low noise measurements, will allow g-modes detection and precise diameter measurements besides accurately establishing the relationship between irradiance and diameter changes. Providing an absolute measure of the solar diameter to 1 milliarcsecond, PICARD is the first step towards instruments capable of accurate and perennial measurements, for the centuries to come, of the solar-terrestrial influence. The objectives of the mission, instrument capabilities, observing modes and performances are described.

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