Observations of thermospheric neutral winds by the UCL Doppler imaging system at Kiruna in northern Scandinavia

Details Observations of thermospheric neutral winds by the UCL Doppler imaging system at Kiruna in northern Scandinavia Observations of thermospheric neutral winds by the UCL Doppler imaging system at Kiruna in northern Scandinavia

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..861b&link_type=abstract

(IAGA, Symposium on Coupling, Energetics, Dynamics and Electrodynamics of Atmospheric Regions, Vancouver, Canada, Aug. 1987) Jou

Physics

14

Auroral Zones, Fabry-Perot Interferometers, Image Processing, Polar Regions, Thermosphere, Electron Precipitation, Ohmic Dissipation, Scandinavia

Scientific paper

Thermospheric winds are mapped using the OI emission at 630 nm (240 km altitude) from a region up to about 400 km radius about Kiruna, Sweden, obtained from a Doppler imaging Fabry-Perot interferometer with a 13.2-cm aperture. Data is presented from December 1986 obtained during periods with both clear skies and active auroral and geomagnetic conditions. Maps of the neutral wind flow within the auroral oval during disturbed conditions and near magnetic midnight show continuous and rapid changes of thermospheric winds. Eddies observed within the mean flow around magnetic midnight are 100-300 km in size with fluctuations at all time scales resolved by the 10 min between successive Doppler images. It is suggested that the local and short period fluctuations are a filtered response of the thermosphere to rapid local variations of the canvection and precipitation patterns, within a background of global scale changes.

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