Irradiance Calibration Using a Cryogenic Radiometer and a Broadband Light Source

Details Irradiance Calibration Using a Cryogenic Radiometer and a Broadband Light Source Irradiance Calibration Using a Cryogenic Radiometer and a Broadband Light Source

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh13c..07m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH13C-07

Astronomy and Astrophysics

Astrophysics

[1650] Global Change / Solar Variability, [3305] Atmospheric Processes / Climate Change And Variability, [7538] Solar Physics, Astrophysics, And Astronomy / Solar Irradiance, [7594] Solar Physics, Astrophysics, And Astronomy / Instruments And Techniques

Scientific paper

Total solar irradiance measurements have been made from space based instruments for the past several decades. Due to a variety of reasons which range from instrumental degradation to differences in optical design, the data from these sources have proved difficult to overlap and place on an absolute scale. Some previous calibration efforts have used the sun as a source while operating the instrument in a large vacuum chamber. More recent efforts to provide ground based, pre-flight intercomparisons between flight radiometers and recently developed high power cryogenic radiometers using lasers. We are currently developing a calibration facility at The Naval Research Laboratory which uses a high power cryogenic radiometer with a broadband light source with near solar illumination. The system uses a very low scattered light vacuum calibration tank used to perform the stray light tests of the LASCO and SECCHI coronagraphs on the SOHO and STEREO missions. This presentation will address the status of our system, recent measurements, and future plans.

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