E layer ionospheric disturbances following the Coalinga earthquake

Details E layer ionospheric disturbances following the Coalinga earthquake E layer ionospheric disturbances following the Coalinga earthquake

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..227f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 227-234. DOE-sponsored research.

Computer Science

Sound

3

Doppler Effect, E Region, Earthquakes, F Region, Ionospheric Disturbances, Radio Transmission, Electron Density (Concentration), High Frequencies, Propagation Modes, Sound Waves, Traveling Waves, Wave Propagation

Scientific paper

Doppler shifts in HF radio transmissions through the ionospheric F region following the Coalinga, CA, earthquake of May 1983 were described by Wolcott et al. (1984). Here, disturbances which appeared between 400 and 500 sec after the earthquake as peaks or broad bands of enhanced power in the spectra of the HF transmissions and not as Doppler shifts are reported. While the time delay (600-800 sec) before the occurrence of the Doppler shifts corresponds to the acoustic travel time to the F region, the time delay for the spectral changes indicates a travel time to the ionospheric E region. It is suggested that the occurrence of the spectral changes represents the presence of temporary E-region propagation modes induced by the passage of the acoustic waves responsible for the Doppler shifts observed at higher altitudes. Because the enhanced spectral power occurs at negative frequency relative to that of the F-region propagation modes, the disturbances could be the result of reflections from electron density gradients induced by upwardly propagating acoustic waves.

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