Computer Science – Sound
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40.1303t&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, Dec. 1978, p. 1303-1305, 1307, 1308.
Computer Science
Sound
F Region, Gravity Waves, Ionospheric Sounding, Atmospheric Models, Ionospheric Propagation, Mathematical Models, Radio Echoes
Scientific paper
Fixed frequency soundings at 4.2 MHz frequency were carried out at Sodankyla (67 deg 22 min N, 26 deg 38 min E) using aerials with a northward tilted antenna pattern. The second-order echo in virtual height versus time recording occasionally shows a peculiar sawtooth behaviour. Model calculations indicate that the phenomenon can be explained by medium-scale gravity waves in the F-layer. The period of the gravity wave can be reduced most accurately from the second-order trace, and it is possible to make a distinction between the poleward and the equatorward propagation of the disturbance. The measured periods vary from 15 to 65 min. In the daytime, when the measurement is possible, the propagation is invariably equatorwards. The phenomenon is only observable during the winter months. It does not seem to have any correlation with magnetic activity.
Nygrén T.
Turunen Tauno
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