All-Sky Doppler Interferometer (ASDI): Determinations of thermospheric wind and temperature fields over large regions of the upper atmosphere

Details All-Sky Doppler Interferometer (ASDI): Determinations of thermospheric wind and temperature fields over large regions of the upper atmosphere All-Sky Doppler Interferometer (ASDI): Determinations of thermospheric wind and temperature fields over large regions of the upper atmosphere

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2266..101b&link_type=abstract

Proc. SPIE Vol. 2266, p. 101-108, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research, Jinxu

Physics

Optics

Scientific paper

A novel all-sky Doppler interferometer (ASDI) has been used to measure Doppler shifts and widths of nightglow emission lines from the upper atmosphere, thereby permitting determination of the neutral wind and temperature fields over regions up to 2000 km in diameter. The ASDI instrument consists of efficient all-sky (160 degree(s) field-of-view) input optics, a 100 mm aperture Fabry-Perot interferometer and output optics which focus 5 orders of the interference ring pattern superposed on the sky image onto a 512 X 512 pixel, LN(subscript 2)-cooled (-150 degree(s)C) CCD detector. Good quality CCD images of the midlatitude nightglow oxygen 630.0 nm red line (approximately equals 300 km altitude) and 557.7 nm green line (approximately equals 105 km altitude) and the OH 799.4 nm line (approximately equals 86 km altitude) are obtained in 5 - 15 min exposures. The image signal-to-noise ratio is sufficient for division of the 5 circular interference rings into 24 equal azimuthal sectors, so that Doppler shifts and widths for 120 distinct regions of the sky can be obtained from one exposure. Wind and temperature fields derived from the ASDI nightglow 630 nm measurements are compared for observations following the autumnal and the vernal equinoxes.

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