Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..165b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Feb. 1987, p. 165-176. Research supported by the Austr
Physics
13
Midlatitude Atmosphere, Spread F, Traveling Ionospheric Disturbances, Daytime, F 2 Region, Ionograms, Statistical Analysis
Scientific paper
Statistical analyses using superposed-epoch methods indicate, at a high level of significance, a probable association (at midlatitudes) between night-time spread-F and day-time TIDs, as judged by diffuse spreading on the second-hop day-time ionogram and by a distortion of any kind of the first-hop day-time ionogram. Further evidence for this association is presented by using ionograms from a new (research oriented) ionosonde which can be programmed to record over small frequency ranges and small height ranges, in addition to providing direction-of-arrival, phase-path and amplitude information on the signals recorded. Day-time wave trains of up to 4 cycles are discussed in terms of frequency-spread and range-spread traces which appear on the ionograms at these times. This detail is made possible by the recording of 360 ionograms over a period of approximately 3 h. Other examples of what can be classed as day-time spread-F ionograms are discussed in terms of additional traces recorded both near f0F2 and f0F1 positions on ionograms.
Bowman G. G.
Dunne G. S.
Hainsworth D. W.
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