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Short-period VLF emissions as solitary envelope waves in a magnetospheric plasma maser

P.A. Bespalov 1 Michel Parrot 2 J. Manninen 3
1 Institute of Applied Physics of RAS
2 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
3 Sodankylä Geophysical Observatory
Abstract : Space and ground-based experiments have shown evidence of natural short-period VLF emissions in which separate spectral elements are repeated with a periodicity of 2-7 s. Their basic morphological properties are found on the basis of original experimental data. In our opinion, excitation of such emissions is the result of quasi-linear relaxation effects that compensate for natural spectral dispersion. The quasi-linear relaxation of the energetic electron distribution function incrementally changes wave cyclotron instability and hence the VLF emission spectral forms. Some properties of the quasi-linear interaction of whistler waves with magnetospheric radiation belt electrons are studied. It is shown that quasi-linear relaxation can increase the cyclotron instability at the leading edge of an electromagnetic pulse. This effective saturation of absorption facilitates the division of VLF hiss-like emission into separate electromagnetic pulses without spectral modification from one pulse to the next. Some features and manifestations of this effective saturation of absorption are discussed. The results are important for a better understanding of temporal and spatial structures of VLF whistler-mode emissions and energetic electron fluxes.
Keywords : Whistler waves Spectrogram Wave–particle interaction
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01256201
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Submitted on : Thursday, January 14, 2016 - 2:56:54 PM
Last modification on : Wednesday, September 23, 2020 - 4:36:14 AM

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P.A. Bespalov, Michel Parrot, J. Manninen. Short-period VLF emissions as solitary envelope waves in a magnetospheric plasma maser. Journal of Atmospheric and Solar-Terrestrial Physics, Elsevier, 2010, 72 (17), pp.1275-1281. ⟨10.1016/j.jastp.2010.09.001⟩. ⟨insu-01256201⟩

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