Excitation of Rossby waves by HF electromagnetic seismic origin emissions in the earth's mesosphere
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- 作者：N.L. Tsintsadze ; T.D. Kaladze ; L.V. Tsamalashvili
- 关键词：Electron cyclotron electromagnetic radiation ; Amplitude modulation ; Earthquake precursors
- 刊名：Journal of Atmospheric and Solar-Terrestrial Physics
- 出版年：2009
- 出版时间：December 2009
- 年：2009
- 卷：71
- 期：17-18
- 页码：1858-1863
- 全文大小：239 K
文摘
Interaction of high-frequency seismo-electromagnetic emissions with the weakly ionized gas of the ionospheric D-layer is considered. It is shown that through the earth's ionosphere weakly damped high-frequency electron cyclotron electromagnetic waves can propagate. These new type of waves easily reach the ionospheric D-layer where they interact with the existing electrons and ions. Acting on electrons ponderomotive force is taken into account and corresponding modified Charney equation is obtained. It is shown that only nonlinear vortical structures with negative vorticity (anticyclone) can be excited. The amplitude modulation of electromagnetic waves can lead to the excitation of Rossby waves in the weakly ionized gas. The corresponding growth rate is defined. Depending on the intensity of the pumping waves generated by seismic activity different stable and unstable branches of oscillations are found. Detection of the new oscillation branches and energetically reinforcing Rossby solitary vortical anticyclone structures may be serve as precursors to earthquake.