Computer Science – Sound
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33.1013c&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 33, Sept. 1985, p. 1013-1022. CNRS-supported research.
Computer Science
Sound
33
Auroral Zones, Ionospheric Sounding, Mesopause, Noctilucent Clouds, Atmospheric Physics, Hydroxyl Emission, Observation, Waves
Scientific paper
During a campaign of optical observations at high latitude, a bidimensional study of the wave structure of the OH layer has been performed in December 1981 from Sodankyla (Finland). This site is one of the three stations of the EISCAT ionosphere sounding system. It has been found that a wave field covering an area of 1 million sq km may extend to latitudes as high as 70 deg N. The OH wave structure shows many similarities with noctilucent clouds. The fairly large horizontal wavelength, of the order of 40 km cannot easily be explained by a wave motion at an interface. The observed wave structure seems to be a result of the propagation of an internal gravity wave in the 80-100 km region. This wave structure was often recorded during the same time as an active aurora was present. As a result, it appears that the perturbation might be correlated with particle precipitations at auroral latitudes.
Clairemidi Jacques
Hersé Michel
Moreels Guy
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