Simultaneous observations of ionospheric quasiperiodic scintillations from short and long meridional baselines using VHF transmissions from Transit satellites

Details Simultaneous observations of ionospheric quasiperiodic scintillations from short and long meridional baselines using VHF transmissions from Transit satellites Simultaneous observations of ionospheric quasiperiodic scintillations from short and long meridional baselines using VHF transmissions from Transit satellites

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..277h&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 3, p. 277-283.

Physics

Scientific paper

For the first time it was possible to observe regular quasiperiodic scintillations (QPS) in VHF radio-satellite transmissions from orbiting satellites simultaneously at short (2.1km) and long (121km) meridional baselines in the vicinity of a typical mid-latitude station (Brisbane; /27.5°S and /152.9°E geog. and /35.6° invar.lat.), using three sites (St. Lucia-S, Taringa-T in Brisbane and Boreen Pt.-B, north of Brisbane). A few pronounced quasiperiodic (QP) events were recorded showing unambiguous regular structures at the sites which made it possible to deduce a time displacement of the regular fading minimum at S, T and B. The QP structure is highly dependent on the geometry of the ray-path from a satellite to the observer which is manifested as a change of a QP event from symmetrical to non-symmetrical for stations separated by 2.1km, and to a radical change in the structure of the event over a distance of 121km. It is suggested the short-duration intense QP events are due to a Fresnel diffraction (or a reflection mechanism) of radio-satellite signals by a single ionospheric irregularity in a form of an ellipsoid with a large ionization gradient along the major axis. The structure of a QP event depends on the angle of viewing of the irregular blob from a radio-satellite. In view of this it is suggested that the reported variety of the ionization formation, responsible for different types of QPS, is only apparent but not real.

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