Physics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..617d&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 5, p. 617-629
Physics
9
Auroral Electrojets, Auroral Zones, Emission Spectra, Gravity Waves, Night, Thermosphere, Energy Transfer, Solar Activity, Spectrophotometry, Wave Propagation
Scientific paper
Night-time observations of O ((sup 1) D) lambda-630 nm and O((sup 1) S) lambda-558 nm thermospheric emissions were made at Mawson, Antarctica (67.6 deg S, 62.9 deg E) from 1982 to 1989, using a three-field photometer. Cross-spectral analysis of the data was used to extract frequencies and horizontal trace velocities of periodic structures. Structures in the lambda-630 nm emission were characteristic of large-scale waves, and those in the lambda-558 nm emission were characteristic of medium-scale waves. The results showed distinct polarization of the propagation azimuths; waves in the lambda-630 nm emission propagated approximately northwestward throughout the 8 yr period, while propagation azimuths of waves in the lambda-558 nm emission appeared to be solar-cycle-dependent. It is suggested that waves observed in the lambda-630 nm emission were of predominantly auroral electrojet origin, while those observed in the lambda-558 nm emission were of both auroral and tropospheric origin.
de Deuge M. A.
Greet Pene A.
Jacka F.
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