Sky-wave backscatter observations of sporadic-E over Japan
作者： Takashi Tanaka
DOI: 10.1016/0021-9169(79)90013-8
关键词: Geology 、 Sporadic E propagation 、 Backscatter 、 Meteorology 、 Variation (astronomy) 、 Cloud cover 、 Azimuth 、 Skywave 、 Cloud physics 、 Ionospheric sounding 、 Atmospheric sciences
摘要: Abstract Observations of sporadic-E (Es) activity have been carried out during 1970–1974 by using a 25 MHz sounder operating at Iioka, Japan (36°N). Earth backscatter echoes were presented on range-azimuth-intensity plots and recorded facsimile paper. Examination individual Es clouds has shown the variations in sizes lifetimes with time day season. drifted predominantly toward west-southwest. Analysis drift vectors revealed presence north-south variation direction semi-diurnal period. The observed cloud motions are consistent interpretation that move neutral winds lower E-region. seasonal dependence azimuthal occurrence east-west difference over Japan. is found to be due movement latitudinal position maximum activity. which mainly caused coefficient between land sea was only few non-summer months.
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