Skip to Main content Skip to Navigation
Journal articles

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

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.
Document type :
Journal articles
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-01256201
Contributor : Nathalie Pothier <>
Submitted on : Thursday, January 14, 2016 - 2:56:54 PM
Last modification on : Wednesday, September 23, 2020 - 4:36:14 AM

Identifiers

Collections

Citation

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⟩

Share

Metrics

Record views

129