Electron temperature and electron density in the F-region of the ionosphere. I - Observed relationship

Physics

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Electron Energy, F Region, Ionospheric Ion Density, Solar Flux, Solar Terrestrial Interactions, Geomagnetic Latitude, Heat Balance, Incoherent Scatter Radar, Vertical Distribution

Scientific paper

Ionospheric data from three incoherent scatter stations over the 225-450 km height range were analyzed over a wide range of solar conditions, and the different mechanisms involved in the heat balance of the electron population are discussed. A relation between electron temperature (Te), electron density (N), and solar flux at 10.7 cm wavelength is established that is seen to be modified for electron densities of less than 5 x 10 to the 11th/cu m in a way that varies with height and latitude. In Malvern and St. Santin, the higher electron temperatures and N2 concentration results in excitation of the vibrational states of nitrogen becoming a significant cooling process, cutting off the rise in Te at low electron density values. At Arecibo, the lower Te and N2 values indicate that vibrational cooling is not important, and a nonlinear relationship between variables is expected.

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