کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1777635 1021752 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Acoustic-gravity waves in the Earth's ionosphere
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
Acoustic-gravity waves in the Earth's ionosphere
چکیده انگلیسی

Taking into account the existence of charged particles in the Earth's ionosphere the propagation of acoustic-gravity waves is investigated. The influence of the Coriolis force is also taken into account. The weakly ionized ionospheric D, E, and F  -layers are considered. The existence of a cut-off frequency at 2Ω02Ω0 (Ω0Ω0 is the value of the angular velocity of the Earth's rotation) is noted. It is shown that the linear waves are damped because of the Pedersen conductivity. When the acoustic-gravity waves are excited by external events (volcanic eruptions, earthquakes, lightning strikes, etc.) their amplitudes grow until self-organization of these waves into nonlinear vortex solitary structures is admitted. Taking into account the interaction of the induced ionospheric current with the geomagnetic field the governing nonlinear equations are deduced. The formation of dipole vortex solitary structures of low-frequency internal gravity waves is shown for the stable stratified ionosphere. The dynamic energy equation for such nonlinear structures is obtained. It is shown that nonlinear solitary vortical structures damp due to Joule losses.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 70, Issue 13, September 2008, Pages 1607–1616
نویسندگان
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