First EISCAT measurement of electron-gas temperature in the artificially heated D-region ionosphere |
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| Authors: | A Kero T Bösinger P Pollari E Turunen M Rietveld |
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| Institution: | (1) Department of Physical Sciences, University of Oulu, FIN-90401 Oulu, Finland;(2) Geophysical Observatory, FIN-9960 Sodankylä, Finland;(3) EISCAT, 9027 Ramfjordbotn, Norway;(4) Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany |
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| 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. |
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| Keywords: | Ionosphere (active experiments plasma temperature and density wave propagation) |
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