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| Titel |
First EISCAT measurement of electron-gas temperature in the artificially heated D-region ionosphere |
| VerfasserIn |
A. Kero, T. Bösinger, P. Pollari, E. Turunen, M. Rietveld |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 9 ; Nr. 18, no. 9, S.1210-1215 |
| Datensatznummer |
250014070
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1210-2000.pdf |
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| Zusammenfassung |
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) |
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