Excitation of VLF quasi-electrostatic oscillations in the ionospheric plasma |
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| Authors: | B Lundin C Krafft G Matthieussent F Jiricek J Shmilauer P Triska |
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| Institution: | (1) Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Academy of Sciences, Troitsk, Moscow region, 142092, Russia;(2) Laboratoire de Physique des Gaz et des Plasmas, Centre National de la Recherche Scientifique, Université Paris Sud, 91405 Orsay Cedex, France;(3) Institute of Atmospheric Physics, Czech Academy of Sciences, Bocni 11, Prag, 14131, CR |
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| Abstract: | A numerical solution of the dispersion equation for electromagnetic waves in a hot magnetized collisionless plasma has shown that, in a current-free ionospheric plasma, the distortion of the electron distribution function reproducing the downward flow of a thermal electron component and the compensating upward flow of the suprathermal electrons, which are responsible for the resulting heat flux, can destabilize quasi-electrostatic ion sound waves. The numerical analysis, performed with ion densities and electron temperature taken from the data recorded by the Interkosmos-24 (IK-24, Aktivny) satellite, is compared with a VLF spectrum registered at the same time on board. This spectrum shows a wide frequency band emission below the local ion plasma frequency. The direction of the electron heat flux inherent to the assumed model of VLF emission generation is discussed. |
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