Weak daytime spread-F signals from the mid-latitude ionosphere

Details Weak daytime spread-F signals from the mid-latitude ionosphere Weak daytime spread-F signals from the mid-latitude ionosphere

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..127b&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences (ISSN 0980-8752), vol. 5, June 1987, p. 127-132. Research su

Physics

Ionospheric Propagation, Midlatitude Atmosphere, Signal Analysis, Spread F, Backscattering, Daytime, Inhomogeneity, Ionograms

Scientific paper

Although it is generally thought that spread-F occurs only at night in mid-latitude regions, this paper reports the existence of daytime first-hop range spreading recorded by a modern (research oriented) ionosonde. The signal strengths of these spread traces which (except for small range spread) are weak when compared with main-trace signal strengths, gradually fall with increasing excess range. Associated second-hop spread which is seen regularly on standard ionograms and previously thought to be caused by ground backscatter has signal strengths some 10 dB greater than the first-hop spread. The results suggest randomly-distributed small-scale field-aligned irregularities to be responsible for both first-hop and second-hop spread. These small-scale daytime irregularities which produce the first-hop spread do not appear to have been reported previously.

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