Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54.1513b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 11-12, p. 1513-1521.
Physics
4
Spread F, Temperate Regions, Traveling Ionospheric Disturbances, Annual Variations, Daytime, Particle Density (Concentration), Solar Cycles, Sunspots
Scientific paper
This paper is concerned with the ionospheric irregularities produced during daylight hours in mid-latitude regions by medium-scale travelling ionospheric disturbances (MS-TIDs) as these disturbances pass overhead at a recording station. These irregularities are detected as ionogram trace distortions as well as by spread-F conditions particularly related to the second-hop reflections of HF radio waves. The existence of a significant amount of spread on second-hop ionogram traces during the passage of two particular MS-TIDs is illustrated and discussed. Experimental evidence is presented to suggest that, similar to the results for night-time spread-F, the occurrence of these daytime events is inversely related to variations in the neutral-particle density of the upper atmosphere, for the annual and sunspot-cycle variations. However, the results do not show a similar inverse relationship for the diurnal variation.
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