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Post Info TOPIC: Picard satellite
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PICARD is a satellite dedicated to the simultaneous measurement of the absolute total and spectral solar irradiance, the diameter and solar shape, and to the Sun's interior probing by the helioseismology method. These measurements obtained throughout the mission will allow study of their variations as a function of solar activity. It launched, along with the Prisma spacecraft, on June 15, 2010 on a Dnepr-1 launcher from Dombarovskiy Cosmodrome, near Yasny, Russia.
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Title: PICARD SODISM, a space telescope to study the Sun from the middle ultraviolet to the near infrared
Authors: M. Meftah (1), J.-F. Hochedez (1,7), A. Irbah (1), A. Hauchecorne (1), P. Boumier (2), T. Corbard (3), S. Turck-Chièze (4), P. Assus (3), E. Bertran (1), P. Bourget (8), F. Buisson (5), M. Chaigneau (2), L. Damé (1), D. Djafer (6), C. Dufour (1), P. Etcheto (5), P. Ferrero (1), M. Hersé (1), J.-P. Marcovici (1), M. Meissonnier (1), F. Morand (3), G. Poiet (1), J.-Y. Prado (5), C. Renaud (3), N. Rouanet (1), M. Rouzé (5), D. Salabert (3), A.-J. Vieau (1) ((1) LATMOS, CNRS, Université Paris VI, Université de Versailles Saint-Quentin-en-Yvelines, IPSL, France, (2) IAS, CNRS, Université Paris XI, France, (3) OCA, Université de Nice-Sophia Antipolis, CNRS, Nice, France, (4) IRFU, CEA-Saclay, Gif-sur-Yvette, France, (5) CNES, Toulouse, France, (6) Unité de Recherche Appliquée en Energies Renouvelables URAER/CDER, Algeria, (7) ORB - KSB, Allée Circulaire 3., Bruxelles, Belgique, (8) ESO, Chile)

The Solar Diameter Imager and Surface Mapper (SODISM) on board the PICARD space mission provides wide-field images of the photosphere and chromosphere of the Sun in five narrow pass bands (centred at 215.0, 393.37, 535.7, 607.1, and 782.2 nm). PICARD is a space mission, which was successfully launched on 15 June 2010 into a Sun synchronous dawn-dusk orbit. It represents a European asset aiming at collecting solar observations that can serve to estimate some of the inputs to Earth climate models. The scientific payload consists of the SODISM imager and of two radiometers, SOVAP (SOlar VAriability PICARD) and PREMOS (PREcision MOnitor Sensor), which carry out measurements that allow estimating the Total Solar Irradiance (TSI) and the Solar Spectral Irradiance (SSI) from the middle ultraviolet to the red. The SODISM telescope monitors solar activity continuously. It thus produces images that can also feed SSI reconstruction models. Further, the objectives of SODISM encompass the probing of the interior of the Sun via helioseismic analysis of observations in intensity (on the solar disc and at the limb), and via astrometric investigations at the limb. The latter addresses especially the spectral dependence of the radial limb shape, and the temporal evolution of the solar diameter and asphericity. After a brief review of its original science objectives, this paper presents the detailed design of the SODISM instrument, its expected performance, and the scheme of its flight operations. Some observations with SODISM are presented and discussed.

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Blobrana


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Title: Helioseismology with PICARD
Authors: T. Corbard (1), D. Salabert (1), P. Boumier (2), T. Appourchaux (2), A. Hauchecorne (3), P. Journoud (2), A. Nunge (2), B. Gelly (4), J.F. Hochedez (3), A. Irbah (3), M. Meftah (3), C. Renaud (1), S. Turck-Chièze (5) ((1) Laboratoire Lagrange, UMR7293, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur, Nice, France, (2) Institut d'Astrophysique Spatiale, CNRS-Université Paris XI, UMR 8617, Orsay, France, (3) Laboratoire Atmosphères Milieux Observations Spatiales, CNRS, Université Paris~VI \& Université de Versailles Saint-Quentin-en-Yvelines, IPSL, Guyancourt, France, (4) Themis, UPS 853 du CNRS, c/o IAC, La Laguna, Tenerife, Spain, (5) CEA/IRFU/Service d'Astrophysique, AIM, CE Saclay, Gif sur Yvette, France)

PICARD is a CNES micro-satellite launched in June 2010 (Thuillier at al. 2006). Its main goal is to measure the solar shape, total and spectral irradiance during the ascending phase of the activity cycle. The SODISM telescope onboard PICARD also allows us to conduct a program for helioseismology in intensity at 535.7 nm (Corbard et al. 2008). One-minute cadence low-resolution full images are available for a so-called medium-l program, and high-resolution images of the limb recorded every 2 minutes are used to study mode amplification near the limb in the perspective of g-mode search. First analyses and results from these two programs are presented here.

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Title: Picard satellite for solar astrometry
Authors: Costantino Sigismondi

The Picard solar satellite has been launched on June 15, 2010. This mission is dedicated to the measurement of the solar diameter with an expected accuracy of milliarcseconds of arc. The radiometer onboard is to measure the total solar irradiance. The final goal is the evaluation of the W, the logarithmic ratio of radius and luminosity. This parameter will help the climatologists to recover past values of the solar luminosity when the radius is available from ancient eclipses data.

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Dnepr Launches from Yasny with Swedish and French satellite


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