Physics – Fluid Dynamics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gapfd..29..117k&link_type=abstract
Geophysical and Astrophysical Fluid Dynamics (ISSN 0309-1929), vol. 29, June 1984, p. 117-138.
Physics
Fluid Dynamics
8
Gravity Waves, Internal Waves, Thermosphere, Volcanology, Doppler Effect, Maximum Entropy Method, Power Spectra, Spectrum Analysis
Scientific paper
The frequency spectrum of atmospheric waves produced by the Mount St. Helens eruption is examined. Data were taken in the form of ground level pressure variations, the ionospheric electron content variations, and the Doppler shift of HF radio waves reflected from the ionospheric F layer. Attention is focused on the Doppler data and the electron content. The eruption was found to have caused a strong Lamb wave whose horizontal proportions could not be measured with the available ground stations. The Doppler characteristics did, however, match those of a simulated unstable gravity wave in resonance conditions. It is suggested that observed acoustic double peaks are signs of parametric instabilities of gravity waves produced by penetrative cumulus convection.
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