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Fig. 10

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Example of a dark-corrected MiHI data frame of a featureless solar scene. Clearly, the image recorded by the sensor, shown in the bottom panel, is far from featureless and is dominated by spatial structure introduced by the MLA and by spectral features from the solar spectrum. These features are more clearly visible in the middle panel, where the broader dark features are the solar absorption lines, and the narrow features are due to absorption by O2 molecules in the Earth’s atmosphere. The wavelength direction is approximately horizontal throughout the image, but varies somewhat due to image distortion. The measured signal level along the dashed red and blue lines in the middle panel is plotted in the top panel, together with an indication of two telluric O2 lines and two solar Fe I lines that are present in the spectral band. The red line traces the spectrum of a single MLA element with typical transmission properties, and the dark area traced by the blue line contains the spectrum of a misaligned low-transmission MLA element. Clearly, the signal in the dark area still contains some spectral information of the corresponding MLA. The broad dark slanted bands are the prefilter taper areas between two image rows.

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