Determination of the photometric calibration and the large-scale flatfield of the STEREO Heliospheric Imagers: I. HI-1. Danielle Bewsher 1,2,3 , Daniel Brown 2,3 , Chris Eyles 1,4, Barry Kellett 1 , Glenn White 1,5 , Bruce Swinyard 1 1 STFC/Rutherford Appleton Laboratory
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Danielle Bewsher1,2,3, Daniel Brown2,3, Chris Eyles 1,4, Barry Kellett1, Glenn White1,5, Bruce Swinyard1
1 STFC/Rutherford Appleton Laboratory
2 Aberystwyth University
3 Now at: University of Central Lancashire
4 Laboratorio de Procesado de Imagenes
5 The Open University
Measured stellar intensity (DN s-1) vs predicted stellar intensity (DN s-1) from spectrum folding for HI-1A (left) and HI-1B (right).
Measured stellar intensity (DN s-1) versus HI magnitude (mHI) for HI-1A (left) and HI-1B (right)
Measured stellar intensity (DN s-1) versus HI magnitude (mHI) from colour mixing for HI-1A (left) and HI-1B (right)
Surface plots of nominal & optimised large-scale flatfield for HI-1A (top left & right) and HI-1B (bottom left & right)
Lightcurves of binary system HD22766 with nominal pre-flight & optimised flatfield for HI-1A (top left & right) and HI-1B (bottom left & right)