A regional peculiarity of the low-latitude lower ionosphere

Details A regional peculiarity of the low-latitude lower ionosphere A regional peculiarity of the low-latitude lower ionosphere

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ge%26ae..25..131g&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 25, Jan.-Feb. 1985, p. 131-133. In Russian.

Physics

Diurnal Variations, Electromagnetic Absorption, Ionospheric Propagation, Lower Ionosphere, Radio Attenuation, Indian Ocean, Persian Gulf, Recombination Reactions

Scientific paper

Experiments performed with the Al method at frequencies of 2.0 and 2.8 MHz on the ship Akademik Kurchatov during March-June 1976 in the Indian Ocean (28 deg N to 18 deg S, 40-79 deg E) revealed an area (Persian Gulf, 28-24 deg N) with a highly unusual diurnal variation of the ionospheric absorption of radio waves. This peculiarity consisted in extremely small prenoon values of absorption; the difference between the prenoon values and the higher postnoon absorption values at the two frequencies used was considerably higher than the measurement error (+ or - 3 dB). It is suggested that this peculiarity was connected with anomalously high rates of recombination processes in the morning hours in the lower ionosphere in this region.

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