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Solar Irradiance (Swiss contributions to ILWS)

4th ILWS general meeting, Beijing, June 22-23, 2006. Solar Irradiance (Swiss contributions to ILWS). Werner Schmutz, PMOD/WRC, Switzerland ( representing Swiss Space Office ). Overview. Why are solar irradiance measurements required? Future Swiss Irradiance experiments

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Solar Irradiance (Swiss contributions to ILWS)

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  1. 4th ILWS general meeting, Beijing, June 22-23, 2006 Solar Irradiance(Swiss contributions to ILWS) Werner Schmutz, PMOD/WRC, Switzerland (representing Swiss Space Office)

  2. Overview • Why are solar irradiance measurements required? • Future Swiss Irradiance experiments • The future of Total Solar Irradiance

  3. What is the influence of the Sun on the climate? ? Graphics: Dr. J. Beer EAWAG, Switzerland

  4. Solar irradiance variation between maximum and minimum – spectral dependance

  5. Rozanov et al. 2001: what UV-wavelength should be observed? Ozone mixing ratio changes (%) due to a 10% increase of the spectral solar flux in 1 wavelength bin (1 nm).

  6. Filter Radiometers:LYRA/PROBA2 (launch 2007)PREMOS-PFR/PICARD (launch 2008) LYRA: 7-20, 20-70, 125, 215 nm PREMOS: 215, 268, 535, 782 nm

  7. Future PMOD/WRC Irradiance Measurements (phase C/D) C. Fröhlich et al. SOVIM/ISS 2008(?) - 2010 J.-F. Hochedez et al. LYRA/PROBA2 2007 - 2008 W. Schmutz et al. PREMOS/PICARD 2009 - 2019

  8. SOVIM on ISS (launch 2008?): Hardware, tests and calibration finishedacceptance review passed (almost)

  9. LYRA (Status: FM April 2005)

  10. LYRA (Status: FM March 2006) BESSY synchrotron calibration at PTB

  11. PICARD (PI G. Thuillier)PREMOS – SOVAP – SODISM Filter Radiometers Total Solar Irradiance

  12. Summary • SWAP (0.1 Hz) + LYRA (60 Hz) on PROBA2 provide the EUV equivalent in Europe of the NOAA SXI + GOES X-ray monitor 2007-2008 • SODISM + PREMOS on PICARD will continue in the near UV and visual (+TSI) 2008/2009-2011

  13. Total Solar Irradiance measurements • present : • VIRGO on SoHO (since 1996) • ACRIM III on ACRIM-sat (since 2000) • TIM on SORCE (since 2003) • future: • SOVIM (CH/B experiments on ISS 2008) • PREMOS-TSI (CH experiment on PICARD 2008) • SOVAP (B experiment on PICARD 2008) • planned: • RAD (CN/CH experiment on KuaFu-A 2012)

  14. TSI comparison with observations: cycle 21 – 23Wenzler et al. 2005, A&A 432, 1057 Is this approach supported by observations? ITSI = aqIquite sun + anInetwork + afIfaculae + asIsun spot Minimum-ITSI = Iquite sun

  15. Absolutely calibrated TSI measurements TIM/SORCE 2003 -

  16. TSI – comparisons of different composites

  17. PMOD composite of the Total Solar Irradiance the aim is to get experimental long-term information about the TSI

  18. Total Solar Irradianceobservations between 2006 and 2012 ACRIM III 2000 - ? VIRGO/SOHO 1996 - 2007 - ? TIM/SORCE 2003 – 2008 - (?) SOVIM/ISS 2008 – 2009 ? PREMOS-TSI/PICARD 2008 – 2011 SOVAP/PICARD (SDO 2008-2012 has no TSI instrument) NPOESS 2012 National Polar Orbiting Operational Environmental Satellite System may have TSI instrument – but are planned to start not earlier than 2009 (?), more likely as late as 2012

  19. Total Solar Irradianceobservations between 2006 and 2012 ACRIM III 2000 - ? VIRGO/SOHO 1996 - 2009 (?) TIM/SORCE 2003 - 2008 - (?) SOVIM/ISS 2008 – 2009 ? PREMOS-TSI/PICARD 2008 – 2011 SOVAP/PICARD (SDO 2008-2012 has no TSI instrument) NPOESS 2012 National Polar Orbiting Operational Environmental Satellite System may have TSI instrument – but are planned to start not earlier than 2009 (?), more likely as late as 2012 TSI on NPOESS canceled June 2006

  20. Total Solar Irradianceobservations between 2006 and 2012 ACRIM III 2000 - ? VIRGO/SOHO 1996 - 2007 - 2009 TIM/SORCE 2003 – 2008 - (GLORY?) SOVIM/ISS 2008 - 2009 ? PREMOS-TSI/PICARD 2008 - 2013 SOVAP/PICARD (SDO 2008-2012 has no TSI instrument) KuaFu-A2012 RAD comprising: SIM = Solar Irradiance Monitor (CN) DOR = Davos Observatory Radiometer (CH)

  21. Summary 2 Continuation of long term TSI-measurements requires overlapping missions There should be always at least two independent operational experiments • TSI is most likely observed by two experiments until 2009/2010 • The gap 2010-2012 is probably covered by an experiment (extended PICARD and/or GLORY) • There is no approved TSI mission after 2009, but:  good chance for RAD on KuaFu-A 2012 • Other options for 2nd TSI experiment: DynaMICS ? (proposed by Sylvaine Turck-Chièze, F) PICARD

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