Physics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..863o&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, Oct. 1982, p. 863-868.
Physics
7
Earth Atmosphere, Ionospheric Disturbances, Volcanoes, Cascade Range (Ca-Or-Wa), Frequency Shift, Ionospheric Electron Density, Japan, Lamb Waves
Scientific paper
The effects of the Mount St. Helens eruption at 1532 UT on 18 May 1980 on the ionosphere over Japan are examined using data on total electron content obtained at three closely-spaced stations and HF (5 and 8 MHz) Doppler recordings together with microbarograph data for the surface pressure perturbation. The results strongly suggest that ionospheric perturbations having a predominant period of about 9 min propagated from north to south approximately along the great circle path with a horizontal velocity of about 300 m per sec. The observed time variations of perturbations can be well explained in terms of Lamb waves propagating through the atmospheric sound channel while launching up-going waves to produce the ionospheric oscillations.
Kumagai Hidenori
Ogawa Takuro
Sinno K.
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