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STEREO HI Post-Launch Support Chris Davis October 2009

STEREO HI Post-Launch Support Chris Davis October 2009. HI-1 flatfield and photometric calibrations. Have taken into account all available instrument response data – Instrument-level and optics unit-level calibrations at CSL Optics manufacturer’s (ICOS) filter response data

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STEREO HI Post-Launch Support Chris Davis October 2009

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  1. STEREO HI Post-Launch Support Chris Davis October 2009

  2. HI-1 flatfield and photometric calibrations • Have taken into account all available instrument response data – • Instrument-level and optics unit-level calibrations at CSL • Optics manufacturer’s (ICOS) filter response data • CCD manufacturer’s (e2v) QE data • Optical glass manufacturer’s (Schott) transmission data • Response to source spectrum S(λ) predicted as – • Cpred = (A/G) ∫ (λ/hc)S(λ)T(λ)QE(λ)dλ(in DN s–1) • where A is aperture and G is CEB readout gain (e– per DN) Note: The term (λ/hc) is required because CEB response is determined by number of photoelectrons and not by energy flux. Some authors (other instruments) have neglected this!

  3. Results: Large-scale flatfield Surface plots of pre-launch & optimised large-scale flatfield for HI-1A (top left & right) and HI-1B (bottom left & right)

  4. Results: HI-1 photometry • Defined HI-1 magnitude scale for stellar-type objects – • Also conversion factors from DN s–1 pixel–1 to B0 (mean solar brightness) and S10 units for diffuse emission regions.

  5. Accurate alignment using the starfield results in improved background subtraction in HI1B

  6. Davis et al, 2009

  7. Davis et al, 2009

  8. Davis et al, 2009

  9. Williams et al, 2009 (submitted)

  10. New data products J-maps (elongation vs time) C-maps (latitude vs time)

  11. Rouillard et al, 2009 (in preparation)

  12. Rouillard et al, 2009 (in preparation)

  13. Savani et al, Observational evidence of a CME distortion directly attributable to a structured solar wind, Submitted to GRL, 2009. Savani et al, 2009 (in preparation)

  14. Pearson et al, 2009 (in preparation)

  15. Mercury Mars The Pleiades Earth and Moon Astraea Vesta Uranus

  16. Outreach project with a local school to produce light-curves for asteroids such as for Vega (below)

  17. Solar Stormwatch – Outreach project with the Royal Greenwich Observatory

  18. HI data has been used by UK artists Semiconductor in a film that is being exhibited in galleries world-wide and on the web – bringing STEREO to the attention of the arts community

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