PACE OCI on-orbit solar calibration

Jeff McIntire; Shihyan Lee; Robert E. Eplee; Gerhard Meister

doi:10.1117/12.3027461

3 October 2024 PACE OCI on-orbit solar calibration

Jeff McIntire, Shihyan Lee, Robert E. Eplee, Gerhard Meister

Proceedings Volume 13143, Earth Observing Systems XXIX; 131430M (2024) https://doi.org/10.1117/12.3027461
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

The Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission, recently launched on February 8, 2024, has a payload of two polarimeters and the Ocean Color Instrument (OCI). OCI is the next generation sensor for ocean color science from low Earth orbit, drawing heritage from sensors such as MODIS and SeaWiFs, but with increased spectral coverage and improved accuracy. OCI is a grating spectrometer with hyperspectral coverage from the ultraviolet (about 315 nm) to near-infrared (about 895 nm), with additional filtered channels in the short-wave infrared (940 nm – 2260 nm). In order to maintain the high levels of accuracy demanded by the science community, the sensor calibration is monitored on-orbit through daily observations of the Sun. These solar observations are made via one of two quasi-volume diffusers, whose BRDF was measured prior to launch, during a dedicated spacecraft maneuver. One diffuser is used on a daily basis, while the other is used on a monthly basis to track any changes in the daily diffuser performance. These solar observations are used to monitor variations in the instrument gain over time for all spectral bands, and update the gain in the calibration algorithm. The methodology used to estimate the gain variation and the results of this variation since launch are presented in this work.

Conference Presentation

Citation Download Citation

Jeff McIntire, Shihyan Lee, Robert E. Eplee, and Gerhard Meister "PACE OCI on-orbit solar calibration", Proc. SPIE 13143, Earth Observing Systems XXIX, 131430M (3 October 2024); https://doi.org/10.1117/12.3027461

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