In Flight Calibration Monitoring of the CIPS UV Imager Using Atmospheric Rayleigh Scattered Radiance

Details In Flight Calibration Monitoring of the CIPS UV Imager Using Atmospheric Rayleigh Scattered Radiance In Flight Calibration Monitoring of the CIPS UV Imager Using Atmospheric Rayleigh Scattered Radiance

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43a1568c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43A-1568

Physics

0394 Instruments And Techniques

Scientific paper

The Cloud Imaging and Particle Size (CIPS) instrument is a nadir viewing UV imager flying aboard the Aeronomy of Ice in the Mesosphere (AIM) satellite. AIM is at an altitude of approximately 600 km and CIPS has a field of view of approximately 120° along orbit track by 80° across orbit track. This results in a field of view of approximately 2000 km by 1000 km. CIPS observes with a center wavelength at 265.8 nm with a 16.5 nm FWHM with a resolution near nadir of approximately 1 km by 2 km. We describe a method to use the atmospheric Rayleigh scattered radiance observations taken at fast cadence to derive the relative sensitivity across the camera (the flat field). Although the Raleigh scattered UV radiance is highly dependent upon geometry and the mesospheric ozone column abundance, our technique removes the requirement for knowledge of ozone parameters. By taking consecutive images at fast cadence we observe the same geophysical locations, having the same ozone parameters, at many locations across the camera. Observations of the same location with the satellite observing from opposite sides along track from the point of observation will have the same geometry parameters, thus these pairs of observations observe the same phase function adjusted albedo independent of the ozone parameters. The ratio of these measurements is effectively a direct measurement of the relative calibration between the two sets of pixels. After repeating this experiment with the satellite pitched, we string the pairs of pixels together to derive a relative calibration between the pixels in along track strips. In this talk we will present the observation and calibration techniques. We will show that this is a generally applicable technique in the UV and is resistant to systematic trends in the flat field.

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