Mustapha Meftah
(CNRS-LATMOS)
PICARD contains a double program with in-space and on-ground measurements. Space observations are a priori most favourable, however, space entails also technical challenges, a harsh environment, and a finite mission lifetime. The PICARD spacecraft, launched on June 15, 2010 was retired in April 2014. On ground, the instruments are less affected by in-space degradation and maintenance is easily provided so if the atmosphere is properly monitored and taken into account, they still represent an opportunity to generate the needed long-term time-series. That is why ground measurements have been carried out since May 2011 and are pursued after the space program. In this talk, we describe both sets of instruments and corrections, and then present our current results about solar radius variations after five years of solar observations.
Summary
PICARD contains a double program with in-space and on-ground measurements. Space observations are a priori most favourable, however, space entails also technical challenges, a harsh environment, and a finite mission lifetime. The PICARD spacecraft, launched on June 15, 2010 was retired in April 2014. On ground, the instruments are less affected by in-space degradation and maintenance is easily provided so if the atmosphere is properly monitored and taken into account, they still represent an opportunity to generate the needed long-term time-series. That is why ground measurements have been carried out since May 2011 and are pursued after the space program. In this talk, we describe both sets of instruments and corrections, and then present our current results about solar radius variations after five years of solar observations.
Mustapha Meftah
(CNRS-LATMOS)
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