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The DynaMICCS perspective |
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| Authors: | S Turck-Chièze P Lamy C Carr P H Carton A Chevalier I Dandouras J M Defise S Dewitte T Dudok de Wit J P Halain S Hasan J F Hochedez T Horbury P Levacher M Meissonier N Murphy P Rochus A Ruzmaikin W Schmutz G Thuillier S Vivès |
| Institution: | 1. CEA/DSM/ IRFU CE Saclay, 91191, Gif sur Yvette Cedex, France 2. Laboratoire d’Astrophysique de Marseille BP 8, 13376, Marseille cedex 12, France 3. The Blackett Laboratory, Imperial College London, London, SW7 2BW, UK 4. Royal Meteorological Institute of Belgium, Ringlaan 3, 1180, Brussel, Belgium 5. CESR, CNRS, Toulouse, France 6. Centre Spatial de Liège, Avenue du Pré Aily, 4031, Angleur, Belgium 7. LPCE/CNRS, 3A Av. de la Recherche Scientifique, 45071, Orleans cedex 2, France 8. Indian Institute of Astrophysics, Bangalore, 560034, India 10. Service d’Aronomie du CNRS, 91371, Verrires-le-Buisson, France 9. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA 11. PMOD/WRC, Dorfstrasse 33, 7260, Davos Dorf, Switzerland |
| Abstract: | The DynaMICCS mission is designed to probe and understand the dynamics of crucial regions of the Sun that determine solar variability, including the previously unexplored inner core, the radiative/convective zone interface layers, the photosphere/chromosphere layers and the low corona. The mission delivers data and knowledge that no other known mission provides for understanding space weather and space climate and for advancing stellar physics (internal dynamics) and fundamental physics (neutrino properties, atomic physics, gravitational moments...). The science objectives are achieved using Doppler and magnetic measurements of the solar surface, helioseismic and coronographic measurements, solar irradiance at different wavelengths and in-situ measurements of plasma/energetic particles/magnetic fields. The DynaMICCS payload uses an original concept studied by Thalès Alenia Space in the framework of the CNES call for formation flying missions: an external occultation of the solar light is obtained by putting an occulter spacecraft 150 m (or more) in front of a second spacecraft. The occulter spacecraft, a LEO platform of the mini sat class, e.g. PROTEUS, type carries the helioseismic and irradiance instruments and the formation flying technologies. The latter spacecraft of the same type carries a visible and infrared coronagraph for a unique observation of the solar corona and instrumentation for the study of the solar wind and imagers. This mission must guarantee long (one 11-year solar cycle) and continuous observations (duty cycle > 94%) of signals that can be very weak (the gravity mode detection supposes the measurement of velocity smaller than 1 mm/s). This assumes no interruption in observation and very stable thermal conditions. The preferred orbit therefore is the L1 orbit, which fits these requirements very well and is also an attractive environment for the spacecraft due to its low radiation and low perturbation (solar pressure) environment. This mission is secured by instrumental R and D activities during the present and coming years. Some prototypes of different instruments are already built (GOLFNG, SDM) and the performances will be checked before launch on the ground or in space through planned missions of CNES and PROBA ESA missions (PICARD, LYRA, maybe ASPIICS). |
| Keywords: | Global solar magnetism Formation flying Solar activity Solar variability Solar wind-irradiance Solar gravity Acoustic modes |
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