Phase and amplitude relationships of wave structure observed in the lower thermosphere

Details Phase and amplitude relationships of wave structure observed in the lower thermosphere Phase and amplitude relationships of wave structure observed in the lower thermosphere

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4576r&link_type=abstract

Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4576-4580.

Computer Science

Sound

5

Ionospheric Composition, Satellite Observation, Thermosphere, Wave Propagation, Electron Density Profiles, Ionospheric Ion Density, Ionospheric Sounding, Neutral Particles

Scientific paper

Data from the Atmosphere Explorer-C satellite clearly exhibit wavelike variations in neutral composition, ion density, and electron temperature, which appear to be a general feature of the atmosphere. The neutral constituents do not exhibit uniform wave characteristics since the density variations of argon are approximately twice those of molecular nitrogen and helium structure has about one-half the amplitude of the N2 variation. The waves evident in the ion density are nearly in phase with the heavy neutrals, while the electron-temperature variations are predominantly out of phase with those in the ion density. A simple model is suggested to explain the neutral composition results, wherein the enhancements in the major gas densities are in phase with the vertical component of the perturbation velocity of the gas. The vertical velocity modifies the composition by transporting parcels of air to higher or lower regions where the composition is different. The phase relationship between density and velocity implies phase velocities (assuming that these are gravitational waves) of the order of 500 meters per sec.

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