Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984angeo...2..505d&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 2, July-Aug. 1984, p. 505-510. Research supported by the University Grants Commission
Physics
3
Acoustic Coupling, Acoustic Propagation, Earthquakes, Ionospheric Propagation, Seismic Waves, Signal Fading, Acoustic Measurement, Acoustic Velocity, Cross Correlation, Gravity Waves, Signal Fading, Standing Waves
Scientific paper
The amplitude records of a 40 kHz continuous signal propagated over a 5100-km path are used to investigate acoustic coupling into the ionosphere, during the period of 116 earthquakes, where the Rayleigh component of seismic surface waves launches an upward-propagating infrasonic wave. Due to the exponential decrease of atmospheric density with altitude, this wave is amplified at the ionosphere and produces an electron density pattern variation. Quasi-periodic variations in the form of short period fadings that are due to electron density fluctuation have been observed during the period of 63 percent of the earthquakes studied. The present observations are analyzed statistically, with respect to the path of the Rayleigh surface wave and the solar zenith angle.
de Barin Kumar
Sarkar Sanat K.
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