Calibration Results for the COR2 Instrument Aboard the STEREO Satellite

Computer Science – Performance

Scientific paper

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7594 Instruments And Techniques

Scientific paper

We report on the calibration status of the COR2 internally occulting coronagraphs aboard the Solar Terrestrial Relations Observatory (STEREO) satellites. The COR2 instruments are part of the Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) instrument package aboard STEREO. The field of view of the COR2 instruments extends from 2.5 to 15 solar radii and its linear spectral filter transmits from 650nm to 750nm. All pre-flight optical calibration efforts were preformed at the Naval Research Laboratory's Solar Coronagraph Optical Test Chamber (SCOTCH), including: a vignetting function, calculation of stray light effects and image quality. To verify the instrument performance in flight we have developed a star fitting routine to extract the intensity of various stars as they transverse the telescope's field of view. Using the pre- flight and in-flight results in combination with star positions and star counts, we derived calibration factors for the external/internal geometric and photometric calibration. Specifically, calibration efforts include pointing corrections, distortion and vignetting. Calibrations will be implemented to improve the accuracy of scientific calculations performed using the COR2 data set.

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