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Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 18, 1210-1215, 2000
© European Geosciences Union 2000
30 Sep 2000
First EISCAT measurement of electron-gas temperature in the artificially heated D-region ionosphere
A. Kero1, T. Bösinger1, P. Pollari1, E. Turunen2, and M. Rietveld3 1University of Oulu, Department of Physical Sciences, FIN-90401 Oulu, Finland
2Geophysical Observatory, FIN-9960 Sodankylä, Finland
3EISCAT, 9027 Ramfjordbotn, Norway; also at Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany
Abstract. The ionospheric electron gas can be heated artificially by a powerful radio wave. According to our modeling, the maximum effect of this heating occurs in the D-region where the electron temperature can increase by a factor of ten. Ionospheric plasma parameters such as Ne, Te and Ti are measured by EISCAT incoherent scatter radar on a routine basis. However, in the D-region the incoherent scatter echo is very weak because of the low electron density. Moreover, the incoherent scatter spectrum from the D-region is of Lorentzian shape which gives less information than the spectrum from the E- and F-regions. These make EISCAT measurements in the D-region difficult. A combined EISCAT VHF-radar and heating experiment was carried out in November 1998 with the aim to measure the electron temperature increase due to heating. In the experiment the heater was switched on/off at 5 minute intervals and the integration time of the radar was chosen synchronously with the heating cycle. A systematic difference in the measured autocorrelation functions was found between heated and unheated periods.

Key words: Ionosphere (active experiments; plasma temperature and density; wave propagation)

Citation: Kero, A., Bösinger, T., Pollari, P., Turunen, E., and Rietveld, M.: First EISCAT measurement of electron-gas temperature in the artificially heated D-region ionosphere, Ann. Geophys., 18, 1210-1215,, 2000.
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