Excitation of ion-acoustic waves in the high-latitude ionosphere
| Autor: | Mikhail Mogilevsky, A. A. Ilyasov, Boris Kozelov, Alexander Chernyshov, I. V. Golovchanskaya |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences business.industry Plasma Acoustic wave 01 natural sciences Instability 010305 fluids & plasmas Computational physics Ion Superposition principle Geophysics Optics Physics::Plasma Physics Space and Planetary Science Electric field Physics::Space Physics 0103 physical sciences Ionosphere business Excitation 0105 earth and related environmental sciences |
| Zdroj: | Geomagnetism and Aeronomy. 57:308-316 |
| ISSN: | 1555-645X 0016-7932 |
| DOI: | 10.1134/s0016793217030045 |
| Popis: | The broadband electrostatic turbulence generally observed in the high-latitude ionosphere is a superposition of nonlocal waves of ion-acoustic and ion-cyclotron types. In the presence of a shear of ion parallel velocity, ion-acoustic modes can be induced by an instability emerging due to an inhomogeneous distribution of energy density. This paper is devoted to the studies of excitation of oblique ion-acoustic wave in background configurations with inhomogeneous profiles of both electric field and ion parallel velocity. A numerical algorithm has been developed, and instability was simulated at various parameters of background plasma. The general possibility of oblique ion-acoustic wave generation by a gradient of ion parallel velocity is shown. In this case, the wave spectrum is found to be broadband, which agrees with satellite observations. |
| Databáze: | OpenAIRE |
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