A spectrum of the acoustic-gravity waves associated with Auroral electro-jet |
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| Authors: | E O Okeke |
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| Institution: | (1) Department of Mathematics, University of Benin, Benin City, Nigeria |
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| Abstract: | This model concerns the analysis of Aurora initiated travelling pressure waves in an isothermal atmosphere. Electro-dynamic Lorentz Force associated with auroral electric current density during the periods of geomagnetic activity is invoked as a possible exciting source.The dispersion phenomena in auroral induced acoustic gravity modes in the earth's atmosphere are examined and various cut-off frequencies analysed.Finally, an attempt is made to obtain a far field representation of the forced oscillations by means of Green's Function technique. Therefrom, the spectral amplitudes of the ground-level oscillations are computed. Incorporating various scaling factors, it is deduced that these amplitude components are in reasonable agreement with the results of recent measurements. |
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| Keywords: | Atmospheric physics Acoustic-gravity waves in the atmosphere Auroral electro-jet Dispersion of acoustic-gravity modes |
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