A fully analytic, low and middle latitude ionospheric model.

Details A fully analytic, low and middle latitude ionospheric model. A fully analytic, low and middle latitude ionospheric model.

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989isvg.conf.....a&link_type=abstract

42. AGARD Symposium on Ionospheric Structure and Variability on a Global Scale and Interactions with Atmosphere and Magnetospher

Computer Science

1

Earth Ionosphere: Models, Earth Ionosphere: Electron Densities

Scientific paper

The well-known Chiu ionospheric model is a global empirical model which calculates electron density profiles as a function of latitude, local time, season and solar cycle. It is extensively used by thermospheric dynamicists because its analytic formulation can quickly provide global electron density values. The model, however, has serious shortcomings. Recently, a fully analytic ionospheric model based on the Chiu formulation, has been developed which provides much more realistic, low and mid-latitude electron density distributions. This is accomplished by redefining the latitude and local time dependence of parameters such as hmF2, nmF2, and the topside and bottomside scale heights. The modifications are based on a recently-developed Semi-empirical, Low-latitude Ionospheric Model (SLIM) and involves decomposing hmF2, nmF2 and plasma density scale heights into harmonic terms to describe the local time variations and then applying Hermite polynomials to obtain latitude variations. The analytic model generates electron density profiles under solar cycle minimum, moderate and maximum conditions for winter, summer and equinox periods. Differences between this model and the Chiu model are discussed and comparisons with observed, low-latitude electron density distributions are presented.

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