Computer Science – Sound
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ge%26ae..47..810t&link_type=abstract
Geomagnetism and Aeronomy, Volume 47, Issue 6, pp.810-811
Computer Science
Sound
2
94.20.Ws
Scientific paper
The results of the first experimental reception of electromagnetic signals, emitted by the ground antenna at frequencies of 1 10 Hz in the transition zone in the case when the distance from the transmitter is comparable with the equivalent waveguide height, are presented. The works were performed episodically in 2006, in different seasons and at different time of day, under quiet geomagnetic conditions. A pronounced effect of the state of the ionosphere on the received signal value was found out at distances about 80 km from the transmitter; in this case the seasonal manifestations were more substantial than the daily ones. The obtained results indicate that it is necessary to take into account the effect of the ionosphere on the wave amplitude in the transition zone, when the electromagnetic sounding of the Earth’s structure is performed at frequencies of 1 10 Hz, and that it is reasonable to use artificial waves in this band to perform quasi-vertical sounding of the ionosphere.
Grigor'ev V. F.
Milichenko A. N.
Sidorenko A. E.
Sobchakov L. A.
Tereshchenko Evgenii D.
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