Modulation of polar electrojet by powerful HF waves

Details Modulation of polar electrojet by powerful HF waves Modulation of polar electrojet by powerful HF waves

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2319s&link_type=abstract

Journal of Geophysical Research, vol. 82, June 1, 1977, p. 2319-2325.

Physics

27

Auroral Electrojets, Ionospheric Propagation, Polar Regions, Radio Waves, D Region, E Region, Electron Density Profiles, Electron Energy, High Frequencies, Ionospheric Conductivity, Ionospheric Cross Modulation, Ionospheric Heating, Magnetic Variations, Plasma Conductivity

Scientific paper

Powerful radio waves, as they are used in ionospheric modification experiments, can very efficiently heat the electron gas of the lower ionosphere. If the transmitter operates in a pulsed mode with the pulse repetition rate f, the electron temperature will oscillate with frequency f and thus lead to periodic changes of the electric conductivity. Thus if a dc current is present in the ionosphere, an ac component will be superimposed upon it. As a result the modified ionospheric region will radiate electromagnetic waves with frequency f. An estimate of the power of these very or extremely low frequency waves produced within the ionosphere is performed in this paper. For typical polar electrojet conditions and with the parameters of the modification experiment projected by Max-Planck-Institut (Lindau) a power of a few kilowatts appears possible at frequencies around 10 kHz. It is also found that at extremely low frequencies, around .01 Hz, pulsations of the magnetic field with an amplitude of a few tenths gamma may be excited.

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