The Doppler Imaging System - Initial observations of the auroral thermosphere

Details The Doppler Imaging System - Initial observations of the auroral thermosphere The Doppler Imaging System - Initial observations of the auroral thermosphere

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..273r&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, March 1984, p. 273-277, 279-285.

Physics

27

Auroral Zones, Doppler Effect, Fabry-Perot Interferometers, Geophysical Observatories, Imaging Techniques, Thermosphere, Image Processing, Sudden Storm Commencements, Wind Measurement

Scientific paper

The Fabry-Perot-interferometer (FPI) Doppler imaging system (DIS) developed at University College, London, is characterized, and DIS observations of a storm-sudden-commencement (SSC) event on December 17, 1982, obtained at Kiruna Geophysical Institute, Sweden, are reported. The DIS comprises a 132-mmm Fabry-Perot etalon, an 80-deg-field-of-view, wide-angle telecentric converter, a 510-mm-equivalent-focal-length imaging system, a 2D imaging photon detector, and a control and data-processing minicomputer. The DIS has an etendue 100 times that of a conventional FPI and can deduce the 2D velocity field of a line-emitting areal source. The techniques used in analyzing and interpreting the DIS data are explained and illustrated. The SSC event and the following geomagnetic disturbances were observed in an 800-km-diameter region with the DIS and with a second FPI: chaotic thermospheric flow with westward winds of about 900 m/sec and fluctuations of + or - 150 m/sec over 100-200-km spatial scales were detected.

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