Electron temperature profiles measured up to 8000 km by S3-3 in the late afternooon sector

Physics

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Electron Energy, Electron Plasma, Ionospheric Temperature, Satellite Observation, Temperature Profiles, Thermal Plasmas, Electrostatic Probes, Polar Caps, Radiation Effects, Solar Radiation, Temperature Gradients

Scientific paper

A preliminary survey of thermal electron temperatures in the late afternoon sector (1630-1800 hours magnetic local time) of the high-altitude ionosphere has been made up to 8000-km with data from a spherical Langmuir probe onboard the polar-orbiting satellite S3-3. The temperature of the thermal electrons is found to be almost independent of altitude along closed field lines above about 3000 km when both ends of the magnetic field pass through a sunlit ionosphere at 300-km altitude. Over the sunlit polar cap, a temperature gradient of about 0.4 K/km is observed up to 5000-km altitude. The temperature of the thermal electrons at high altitudes is found to have a dependence on invariant latitude similar to previous observations near 1000-km altitude.

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