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LYOT : LYman Orbiting Telescopes

LYOT : LYman Orbiting Telescopes à bord de la mission franco-chinoise SMESE (Small Explorer for solar Erupions) Frédéric Auchère, Jean-Claude Vial Institut d’Astrophysique Spatiale T. Appourchaux, K. Bocchialini, M. Derouich (I.A.S.) P. Lamy (L.A.M.), S. Koutchmy (I.A.P.)

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LYOT : LYman Orbiting Telescopes

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  1. LYOT : LYman Orbiting Telescopes à bord de la mission franco-chinoise SMESE (Small Explorer for solar Erupions) Frédéric Auchère, Jean-Claude Vial Institut d’Astrophysique Spatiale T. Appourchaux, K. Bocchialini, M. Derouich (I.A.S.) P. Lamy (L.A.M.), S. Koutchmy (I.A.P.) U. Schühle (MPS), E. Antonucci, S. Fineschi (Obs. Turin), M. Romolli (Univ. Florence) Autres collaborations : ORB, CSL, RAL, LESIA, LERMA, … LYOT, SFSA, Juillet 2007

  2. LYOT, SFSA, Juillet 2007

  3. LYOT, SFSA, Juillet 2007

  4. Mécanisme d’initiation des CMEs et Eruptions : reconnexion magnétique from Anzer et Pneumann (1982) LYOT, SFSA, Juillet 2007

  5. Source instability which leads to the CME ? Initiation des Coronal Mass Ejections (CMEs) (1) • 4 criticalparameters concerning the actingforces: • * initial acceleration • * non-radial motions • * transverse (latitudinal) expansion • * initial radial expansion • Must be measured below 2 Rs LYOT, SFSA, Juillet 2007

  6. Source instability which leads to the CME ? Initiation des Coronal Mass Ejections (CMEs) (2) Several models (e.g. flux rope, Amari et al. 2003, breakout model, Aulanier et al. 2001) None have been validated LYOT, SFSA, Juillet 2007

  7. Magnetic field in the corona Corona cannot be fully understood without the magnetic field Measured at the surface Not measured in the corona LYOT, SFSA, Juillet 2007

  8. Bommier & Sahal (1982) Measurements of the coronal magnetic field Hanle effect Rotation polarisation Dépolarisation (B < 50 G pour La) LYOT, SFSA, Juillet 2007

  9. Further studies Structure of the transition between chromosphere and corona Spatial and temporal variability of the La irradiance Origin of solar energetic particles (SEPs) Factor 3 variability at 30.4 nm (~La) SEM/SOHO LYOT, SFSA, Juillet 2007

  10. LYOT Why a La coronagraph ? Why a La imager ? LYOT, SFSA, Juillet 2007

  11. LYOT (and SMESE payload) performances LYOT, SFSA, Juillet 2007

  12. Mission Requirements(1) Continuous observations : SS (6-18) orbit Altitude : 650 – 750 km (radiation belts vs. geocorona) TM : compatible with continuous imaging at 10 s rate (+ compression) : ~ 35 Gbits/day Power : 100 W Volume : ~ 60*60*30 cm3 LYOT, SFSA, Juillet 2007

  13. Mission Requirements (2) P/L mass : < 70 kg Sun-pointed stabilized platform Pointing stability : 0.4 arcsec/s for LYOT ; with a dedicated internal P/L servo mechanism, a platform stability of 36 arcsec/s is OK. Pointing accuracy : 30 arcsec Roll of the S/C (polarization measurements) : ~ twice a week LYOT, SFSA, Juillet 2007

  14. Mission Requirements (3) Duration : 2 years minimum; 3 optimum Time : ASAP after solar maximum of cycle 24 « scheduled «  for 2011-2012 ? Operations : no special requirement but internal reactivity to events (flag signal thru an Internal Data Handling Processor; mass memory ~16 Gb) Data available ASAP to the community through SMC LYOT, SFSA, Juillet 2007

  15. Situation du projet Proposition LYOT : avril 2000 (7 ans déjà …) Prospective CNES : 2002 -> 2004 Mars-Septembre 2006 : Phase 0/A Septembre 2006 – Juin 2007 : Phase A PRR : 7 juin 2007 Steering Committee : 6 juillet 2007 Phase B en 2008 ? Lancement en 2012-2013 ? Cf. le calendrier solaire LYOT, SFSA, Juillet 2007

  16. SMESE and the Sun’ calendar ? (courtesy D. Biesecker, 2007) LYOT, SFSA, Juillet 2007

  17. LYOT LYOT, SFSA, Juillet 2007

  18. LYOT, SFSA, Juillet 2007

  19. The SMESE French-Chinese Team China: PMO : Purple Mountain Observatory, CAS NJU : Nanjing University CSSAR : Center for Space Science and Applied Research (Beijing) NAOC : National Astronomical Observatory, CAS(Beijing) CNSA : Chinese National Space Agency France : LESIA/OP : Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (Paris Observatory) IAS : Institut d‘Astrophysique Spatiale (Orsay) CNES : Centre National d‘Etudes Spatiales Collaborations with other Institutes (LAM, LPCE, Torino/Firenze, CSL, ORB, RAL, SSL, Brazil, GSFC ...) LYOT, SFSA, Juillet 2007

  20. LYMAN ALPHA CORONAGRAPH IMAGER (LACI) OPTICAL DESIGN • Raytracing LACI LYOT, SFSA, Juillet 2007 07/06/2007 SMESE PRR - LYOT Instrument 20 A. Millard

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