Computer Science – Sound
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.4023t&link_type=abstract
Journal of Geophysical Research, vol. 81, Aug. 1, 1976, p. 4023-4026. Bundesministerium für Forschung und Technologie
Computer Science
Sound
3
Atmospheric Composition, Atmospheric Models, Gravity Waves, Satellite Observation, Thermosphere, Critical Frequencies, Data Reduction, Esro 4 Satellite, F 2 Region, Gaseous Diffusion, Ionospheric Propagation, Ionospheric Sounding, Neutral Particles
Scientific paper
Neutral composition waves with a wavelength of about 5000 km and a wave period of about 2.5 h were observed by ESRO 4 in the altitude region of 250 km. The amplitudes are of the order of 25% for Ar, 15% for N2, and roughly 10% for He and O at 25 deg geographic latitude. The Ar and N2 waves are almost in phase, whereas He is in antiphase, and O is in between. The wave amplitudes are seen to decrease toward lower latitudes, suggesting that the composition waves are launched by auroral sources. Simultaneous ground-based ionosonde measurements of the F2 layer critical frequency at middle and low latitudes show a wave period consistent with the satellite observations. From the relation between wavelength and wave period these waves are identified as gravity waves. The theoretical investigation with a multicomponent model shows that diffusion plays a major role in explaining the observed phase and amplitude relations between atmospheric constituents.
Mayr Hans G.
Trinks Hauke
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