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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 7
Ann. Geophys., 24, 1851–1859, 2006
https://doi.org/10.5194/angeo-24-1851-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 1851–1859, 2006
https://doi.org/10.5194/angeo-24-1851-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Aug 2006

09 Aug 2006

Statistical properties of ionospheric stimulated electromagnetic emissions

R. L. Karlsson1, T. D. Carozzi2, L. Norin1, J. E. S. Bergman3, and B. Thidé3,4 R. L. Karlsson et al.
  • 1Department of Astronomy and Space Physics, Uppsala University, Box 515, SE-751 20 Uppsala, Sweden
  • 2Space Science Centre, University of Sussex, Brighton, BN1 9QT, UK
  • 3Swedish Institute of Space Physics, Uppsala, Box 537, SE-751 21 Uppsala, Sweden
  • 4LOIS Space Centre, Växjö University, SE-35195 Växjö, Sweden

Abstract. We have analysed the statistical properties of the stimulated electromagnetic emissions (SEE) spectral features in the steady state, reached after a long period of continuous HF pumping of the ionosphere in experiments performed at the Sura ionospheric radio research facility in Russia. Using a digital filter bank method, we have been able to analyse complex valued signals within narrow frequency bands. Each of the SEE spectral features are thereby separated into a number of narrow spectral components. Statistical tests were performed for all these spectral components and the distributions of the spectral amplitudes and phases were evaluated. Also, a test for sinusoidal components was performed. These tests showed that all observed SEE features were indistinguishable from coloured Gaussian noise. The test results exclude that the SEE features can be the result of a single isolated coherent process, but does not rule out that there could be many statistically independent parametric wave-wave processes taking place simultaneously at various parts of the HF-pumped ionosphere, as long as the superposition from all these is incoherent. Furthermore, from the test results, we cannot exclude the possibility that the waveforms of some, or all, of the SEE features may be chaotic.

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