High-resolution Doppler imager: instrument performance from late 1991 to mid-1999

Details High-resolution Doppler imager: instrument performance from late 1991 to mid-1999 High-resolution Doppler imager: instrument performance from late 1991 to mid-1999

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3756..304s&link_type=abstract

Proc. SPIE Vol. 3756, p. 304-315, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, A

Computer Science

Scientific paper

The High Resolution Doppler Imager (HRDI) on the Upper Atmosphere Research Satellite has been providing measurements of the wind field in the stratosphere, mesosphere, and lower thermosphere since November 1991. Mesospheric temperatures, ozone and O((superscript 1)D) densities, and stratospheric aerosol extinctions coefficients, are also retrieved. The instrument characteristics have been carefully monitored by frequent calibrations during the nearly eight years of operation. The instrument sensitivity showed a significant decrease (close to 50% in some cases) during the first seven and a half years of operation which was caused by the piezoelectric-controlled etalons slowly drifting from a parallel state. A recalibration of the etalons in late 1998 resulted in close to a complete recovery of the instrument sensitivity. The loss of sensitivity was linear with time, with discrete changes occurring at times. Careful modeling of the data permits a determination of the sensitivity as a function of time, allowing the data to be corrected for this systematic effect.

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