Modulational excitation of low-frequency dust acoustic waves in the Earth's lower ionosphere
- Russian Academy of Sciences, Institute of Geosphere Dynamics (Russian Federation)
- Ruhr University Bochum, Institute for Theoretical Physics I (Germany)
During the observation of Perseid, Leonid, Gemenid, and Orionid meteor showers, stable low-frequency lines in the frequency range of 20-60 Hz were recorded against the radio-frequency noise background. A physical mechanism for this effect is proposed, and it is established that the effect itself is related to the modulational interaction between electromagnetic and dust acoustic waves. The dynamics of the components of a complex (dusty) ionospheric plasma with dust produced from the evolution of meteoric material is described. The conditions for the existence of dust acoustic waves in the ionosphere are considered, and the waves are shown to dissipate energy mainly in collisions of neutral particles with charged dust grains. The modulational instability of electromagnetic waves in a complex (dusty) ionospheric plasma is analyzed and is found to be driven by the nonlinear Joule heating, the ponderomotive force, and the processes governing dust charging and dynamics. The conditions for the onset of the modulational instability of electromagnetic waves, as well as its growth rate and threshold, are determined for both daytime and nighttime. It is shown that low-frequency perturbations generated in the modulational interaction are related to dust acoustic waves.
- OSTI ID:
- 21100185
- Journal Information:
- Plasma Physics Reports, Vol. 33, Issue 4; Other Information: DOI: 10.1134/S1063780X07040046; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-780X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dust Acoustic Mode Manifestations in Earth's Dusty Ionosphere
Nonlinear Wave Structures and Plasma−Dust Effects in the Earth’s Atmosphere