Systematic ionospheric electron density tilts (SITs) at mid-latitudes and their associated HF bearing errors

Details Systematic ionospheric electron density tilts (SITs) at mid-latitudes and their associated HF bearing errors Systematic ionospheric electron density tilts (SITs) at mid-latitudes and their associated HF bearing errors

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47.1085t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, Nov. 1985, p. 1085-1097. Research supported by the Min

Physics

Bearing (Direction), Ionospheric Electron Density, Midlatitude Atmosphere, Radio Transmission, Atmospheric Models, Diurnal Variations, Error Analysis, High Frequencies, Ray Tracing, Three Dimensional Models

Scientific paper

Systematic ionospheric tilts (SITs) at midlatitudes and the diurnal variation of bearing error for different transmission paths are examined. An explanation of diurnal variations of bearing error based on the dependence of ionospheric tilt on solar zenith angle and plasma transport processes is presented. The effect of vertical ion drift and the momentum transfer of neutral winds is investigated. During the daytime the transmissions are low and photochemical processes control SITs; however, at night transmissions are at higher heights and spatial and temporal variations of plasma transport processes influence SITs. A HF ray tracing technique which uses a three-dimensional ionospheric model based on predictions to simulate SIT-induced bearing errors is described; poor correlation with experimental data is observed and the causes for this are studied. A second model based on measured vertical-sounder data is proposed. Model two is applicable for predicting bearing error for a range of transmission paths and correlates well with experimental data.

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