Computer Science – Sound
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4389k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4389-4393.
Computer Science
Sound
17
Diurnal Variations, Doppler Effect, High Frequencies, Ionospheric Currents, Ionospheric Sounding, Sudden Storm Commencements, Electric Fields, Frequency Shift, Magnetic Disturbances, Nocturnal Variations, Temporal Distribution
Scientific paper
Consideration is given to the variations of the frequency of a standard HF signal, referred to as SCF, at the time of sudden storm commencements (SSC), based on the observations performed at Kokobunji and Okinawa, Japan, during the period of March 1981 to August 1983. It is shown that the nighttime main frequency deviations of the SCF are caused by the dawn-to-dusk electric field, which coincides with the electric field associated with the DP (polar-originated geomagnetic disturbances) part of the main impulse of SSC. The daytime preliminary frequency deviations of the SCF are explained in terms of the induction electric field associated with the abrupt magnetic increase due to SSC.
Ishimine T.
Kikuchi Tatsuru
Sugiuchi H.
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