Articles | Volume 38, issue 2
https://doi.org/10.5194/angeo-38-297-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-38-297-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
06 Mar 2020
Regular paper |
| 06 Mar 2020
| 06 Mar 2020
Electron heating by HF pumping of high-latitude ionospheric F-region plasma near magnetic zenith
Swedish Institute of Space Physics, Uppsala, Sweden
Björn Gustavsson
Institute for Physics and Technology, The Arctic University of Norway, Tromsø, Norway
Theresa Rexer
Institute for Physics and Technology, The Arctic University of Norway, Tromsø, Norway
Michael T. Rietveld
EISCAT Scientific Association, Ramfjordmoen, Norway
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Electromagnetic emissions stimulated by powerful radio waves in the ionosphere exhibit an exponential power spectrum. Such a spectrum is a characteristic of deterministic chaos. A relevant model of parametrically excited localized lower hybrid oscillations is derived. Numerical simulations show that for parameter values typical of the ionospheric experiments, the temporal evolution may exhibit deterministic chaos with an exponential spectrum that is consistent with the experimental results.
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Short summary
Powerful radio waves transmitted into the ionosphere give the strongest turbulence effects in geomagnetic zenith, antiparallel to the magnetic field in the Northern Hemisphere. Our results obtained with the EISCAT (European Incoherent SCATter association) Heating facility in Norway and the EISCAT UHF incoherent scatter radar together with modelling suggest that the pump wave propagates in the L mode, rather than in the O mode that is usually assumed to be involved in such experiments.
Powerful radio waves transmitted into the ionosphere give the strongest turbulence effects in...
