Global Warming and RFs

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Physicist Michel Parrot tells me he studied VLF frequencies (lower than microwaves) and their effect on ionospheric plasma. 

The project lasted 6.5 years and was not cancelled, he says, but stopped for budgetary reasons.

Parrot, M., J. A. Sauvaud, J. J. Berthelier, and J. P. Lebreton (2007), First in-situ observations of strong ionospheric perturbations generated by a powerful VLF ground-based transmitter, Geophys. Res. Lett., 34, L11111, doi:10.1029/2007GL029368. 

http://www.agu.org/pubs/crossref/2007/2007GL029368.shtml

M. Parrot

Laboratoire de Physique et de Chimie de l'Environnement, Centre National de la Recherche Scientifique, Orléans, France

J. A. Sauvaud

Centre d'Etude Spatiale des Rayonnements, Centre National de la Recherche Scientifique, Toulouse, France

J. J. Berthelier

Centre d'Etude des Environnements Terrestre et Planétaires, Saint Maur des Fossés, France

J. P. Lebreton

Research and Scientific Support Department, European Space Research and Technology Centre, European Space Agency, Noordwijk, Netherlands

This paper is related to observations by the satellite DEMETER of strong ionospheric perturbations close to the VLF transmitter NWC in Australia (L = 1.41). Electrostatic waves from HF to ELF ranges are generated and strong turbulence appears. Fluctuations of electron and ion densities are observed as well as increase of temperature. The perturbations are located to the geographic North of the transmitter and cover an area of ∼500,000 km² which is centred at the altitude of the satellite (700 km) around the magnetic field line at L = 1.41. The phenomenon is due to the electron and ion heating induced by the powerful transmitter VLF wave. This perturbation is in addition to the already known precipitation of energetic particles which interact with the VLF wave through a cyclotron resonance mechanism. The particle precipitation zone is located south of the transmitter at a slightly larger L-shell value (1.9).

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