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Ann. Geophys., 20, 1687-1691, 2002
www.ann-geophys.net/20/1687/2002/
© European Geosciences Union 2002
Letter to the Editor
UHF electromagnetic emission stimulated by HF pumping of the ionosphere
S. M. Grach1, V. M. Fridman2, L. M. Lifshits1, T. S. Podstrigach2, E. N. Sergeev2, and S. D. Snegirev2
1State University of Nizhny Novgorod, Gagarina av. 23, Nizhny Novgorod, 603950, Russia
2Radiophysical Research Institute, B. Pecherskaya 25, Nizhny Novgorod, 603950, Russia
Correspondence to: S. M. Grach (sg@nirfi.sci-nnov.ru)
Abstract. UHF electromagnetic emission (with a
frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF
powerful radio wave is revealed. Possible mechanisms of the emission
excitation, such as plasma mode con-version, scattering or Earth thermal noise
emission off the plasma density irregularities, bremsstrahlung and excitation
of high Rydberg states of the neutral particles by the accelerated electrons
are discussed.
Key words. Ionosphere (active experiments;
wave-particle interactions) – Solar physics, astrophysics, and astronomy
(radio emissions)
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