Composition waves in the thermosphere

Details Composition waves in the thermosphere Composition waves in the thermosphere

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..671m&link_type=abstract

Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 671-676.

Physics

2

Atmospheric Composition, Helium, Nitrogen, Thermosphere, Wave Excitation, Amplitudes, Atmospheric Diffusion, Atmospheric Models, Heat Sources, Latitude, Vertical Distribution

Scientific paper

Neutral-composition waves excited by auroral heat sources are investigated. For horizontal wavelengths of the order of 1000 km, it is concluded that diffusion processes (1) play a significant role such that deviations from diffusive equilibrium prevail for He throughout the thermosphere; (2) produce phase differences of about 220 deg (or -140 deg) between He and N2, and (3) account for He amplitudes comparable to those of N2. These results basically explain recent AE-C satellite measurements which have revealed an anticorrelation between the heavier and lighter constituents of the thermosphere. The calculations also indicate that temperature and N2 concentration are generally out of phase by about 100 deg.

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