stereo hi post-launch support chris davis october 2009
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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STEREO HI Post-Launch Support
Chris Davis
October 2009
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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!
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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)
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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.
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Accurate alignment using the starfield results in improved background subtraction in HI1B
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Davis et al, 2009
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Davis et al, 2009
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Davis et al, 2009
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Williams et al, 2009 (submitted)
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New data products
J-maps (elongation vs time)
C-maps (latitude vs time)
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Rouillard et al, 2009 (in preparation)
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Rouillard et al, 2009 (in preparation)
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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)
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Pearson et al, 2009 (in preparation)
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The Pleiades
MercuryMars
VestaUranus
Astraea
Earth and Moon
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Outreach project with a local school to produce light-curves for asteroids such as for Vega (below)
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Solar Stormwatch – Outreach project with the Royal Greenwich Observatory
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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