Radiance calibration of the High Altitude Observatory white-light coronagraph on SKYLAB

Details Radiance calibration of the High Altitude Observatory white-light coronagraph on SKYLAB Radiance calibration of the High Altitude Observatory white-light coronagraph on SKYLAB

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apopt..16..926p&link_type=abstract

Applied Optics, vol. 16, Apr. 1977, p. 926-930.

Physics

Optics

4

Calibrating, Coronagraphs, Radiance, Skylab Program, Solar Observatories, Instrument Errors, Photographic Processing, Radiation Measurement, Solar Corona, Solar Radiation

Scientific paper

The processing of over 35,000 photographs of the solar corona obtained by the white-light coronograph on Skylab is described. Calibration of the vast amount of data was complicated by temporal effects of radiation fog and latent image loss. These effects were compensated by imaging a calibration step wedge on each data frame. Absolute calibration of the wedge was accomplished through comparison with a set of previously calibrated glass opal filters. Analysis employed average characteristic curves derived from measurements of step wedges from many frames within a given camera half-load. The net absolute accuracy of a given radiance measurement is estimated to be 20%.

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