Computer Science – Sound
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40.1323e&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, Dec. 1978, p. 1323-1329. Deutsche Forschungsgemeinschaft
Computer Science
Sound
E Region, Electromagnetic Absorption, Ionospheric Propagation, Traveling Ionospheric Disturbances, Ionospheric Sounding, Phase Velocity, Solar Activity Effects, Wave Propagation
Scientific paper
Horizontal phase trace velocities of plane-wave modes, determined from measurements of ionospheric absorption performed at four European stations, are used to model spatial phase shifts of quasi-periodic absorption variations in the lower E-region. Whereas wavelike perturbations in the E-region during winter may be attributed to Rossby waves propagating upward from the lower atmosphere, the appearance of traveling disturbances in the summer ionosphere (which is normally shielded from this type of wave by the stratospheric-mesospheric easterlies) points toward additional generation mechanisms. One possibility is that the lower thermosphere itself acts as a source of planetary-scale waves; another possible mechanism may be perturbations due to external modes similar to the five-day wavenumber 1 oscillation in the middle atmosphere.
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