Abstract
Different methods for achieving model profiles of the electron (and ion) temperature have been proposed in view of the International Reference Ionosphere (IRI). A short review of these model representations and the available data base is given. While the presently valid IRI has used an average descriptive model independent from plasma density, it is certain that this latter has great influence, at least during daytime. On the other hand, it does not appear to be appropriate to derive the temperature unambigously from the density value. Based on comparison of measured data from the AE-C and AEROS-B satellites and incoherent backscatter stations (ISC) Millstone Hill, Arecibo and Jicamarca, a new model relation between temperature and density is proposed for daylight hours which depends further on altitude and modified magnetic dip latitude (MODIP).
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