Observations of thermospheric wind velocities and temperatures by the use of a Fabry–Perot Doppler imaging system at Syowa Station, Antarctica

Hideaki Nakajima, Shoichi Okano, Hiroshi Fukunishi, Takayuki Ono

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25 Citations (Scopus)

Abstract

A new optical instrument, the Fabry–Perot Doppler imaging system (FPDIS), has been developed for observations of two-dimensional distributions of thermospheric wind velocities and temperatures by the measurement of the Doppler shift and width of the aurora or of the airglow emission lines of atomic oxygen OI 557.7 nm and OI 630.0 nm over a wide field of view (165°). A technique for the derivation of Doppler temperatures and wind velocities was developed by use of a truncated Fourier series. Thermospheric wind velocities and temperatures have been obtained with unprecedented high temporal (1 min) and spatial (24 points for an all-sky image) resolutions. Errors in the derived wind velocities and temperatures are estimated to be less than 25 m/s and 100 K, respectively, for inner-fringe positions and 35 m/s and 170 K for outer-fringe positions, respectively. This system was applied to observations of thermospheric wind velocities and temperatures at Syowa Station (69.00° S, 39.58° E), Antarctica for the period of one austral winter in 1990.

Original languageEnglish
Pages (from-to)8382-8395
Number of pages14
JournalApplied optics
Volume34
Issue number36
DOIs
Publication statusPublished - 1995 Dec

Keywords

  • All-sky Doppler imaging
  • CCD detector
  • Fabry–Perot interferometer
  • Thermospheric temperature
  • Thermospheric wind

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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