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Ionospheric ELF radio signal generation due to LF and/or MF radio transmissions—II. Interpretation

1982; Elsevier BV; Volume: 44; Issue: 10 Linguagem: Inglês

10.1016/0021-9169(82)90036-8

1878-593X

Paul S. Cannon, T. Turunen, M.J. Rycroft,

Plasma Diagnostics and Applications

It is shown that 1 kHz amplitude modulated waves from one or more distant Soviet LF and/or MF radio transmitters (Cannon, 1982), can heat the auroral D-or lower E-region, modulating the large electrojet current which radiates at 1 kHz. Various mechanisms which can account for a localized generation region far from the transmitters are discussed. The data argue strongly in favour of a mechanism involving periodic inphase heating of the ionosphere by two or more synchronized transmitters. The most likely solutions involve transmissions on 173, 263, 281 and 549 kHz. A 0.6 K peak-peak sinusoidal electron temperature variation superimposed upon a 2 K temperature rise is predicted for the combined effect of these transmitters. An estimate of 0.09 pT for the corresponding 1 kHz magnetic field variations is in good agreement with the experimental field strengths (Cannon, 1982).