Mid-latitude range spread and travelling ionospheric disturbances

Details Mid-latitude range spread and travelling ionospheric disturbances Mid-latitude range spread and travelling ionospheric disturbances

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..215b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, March 1988, p. 215-223. Research supported by the Aust

Physics

15

Midlatitude Atmosphere, Spread F, Traveling Ionospheric Disturbances, Ionograms, Ionosondes, Ionospheric Tilts, Ray Tracing

Scientific paper

This paper first discusses some early results (most hitherto unpublished) on off-vertical reflections which result from tilted isoionic contours associated with the passage of traveling ionospheric disturbances (TIDs). Azimuth of arrival and zenith angle information on these returning signals are discussed together with the role of these signals in producing both resolved and unresolved range spread on ionograms. Some ray tracing through a model ionosphere which incorporates wavelike structures is shown to predict fixed-frequency patterns (on recordings of virtual height vs. time) of converging an diverging satellite traces similar to those observed in practice. New experimental evidence is then presented to suggest (from the N(h) analyses performed) that TID wavetrains of several cycles are effective in producing spread traces on ionograms by specular reflections from the tilted surfaces of each cycle of these wavetrains. Ionograms from a modern ionosonde show that range spread consists primarily of discrete satellite traces even though at times these traces overlap and vary in intensity as a function of frequency thus creating a diffuse range spread ionogram.

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