Electron temperature models of the thermosphere to 1100 km based on ESRO-4 measurements

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Atmospheric Models, Electron Energy, Geomagnetic Latitude, Thermosphere, Vertical Distribution, Electrostatic Probes, Esro 4 Satellite, Satellite-Borne Instruments, Solar Cycles, Temperature Distribution, Time Response

Scientific paper

Measurements of thermospheric electron temperatures at altitudes in the range 250-1100 km, made with a Langmuir probe carried on the polar-orbiting satellite ESRO-4, have been used to derive model functions of electron temperature in terms of altitude, magnetic latitude and local time for the periods November 1972 to June 1973 and March to October 1973. The technique used to compute the coefficients of the model functions is described, and the model electron temperatures are compared with those obtained from similar instruments on the Ariel-1 satellite in 1962 and the ESRO-1A satellite in 1968-1969, and from ground-based observatories. The models reproduce the major features of topside electron distributions - viz., mid-day temperatures exceeding midnight temperatures by about 500 K, dawn enhancement leading to peak temperatures greater than mid-day values particularly around 50 deg magnetic latitude, and temperatures increasing with altitude at all latitudes and with latitude at all altitudes.

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