Parametric excitation of a lower-hybrid drift wave in the ionosphere
- Department of Physics, Indian Institute of Technology, Delhi, New Delhi 110016 (India)
Parametric excitation of a lower-hybrid drift (LHD) wave has been studied in the ionosphere due to the propagation of a high-frequency electromagnetic (EM) pump wave (with wave number {ital k}{sub 0}{approx}0) in the presence of the electron collisions. It is considered to be a four wave interaction process of LHD, electromagnetic pump wave, and two electron plasma waves as sidebands. Nonlinear growth rate of a LHD wave is found to be higher for 1{lt}{ital kr}{sub L{ital e}}{lt}1.5 as compared to the case {ital kr}{sub L{ital e}}{lt}1, where {ital k} and {ital r}{sub L{ital e}}, respectively, are the wave number of the LHD wave and electron Larmor radius. Wavelengths of the excited lower-hybrid drift waves lie in the range of the various irregularities observed by Jicamarca [Farley {ital et} {ital al}., J. Geophys. Res. {bold 75}, 7199 (1970)], and Altair and Tradex radars [R. T. Tsunoda, Geophys. Res. Lett. {bold 7}, 848 (1980)]. It is seen that the nonlinear growth rate drops significantly in the presence of the electron collisions. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 165835
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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