Temporal and Spatial Features of Waves and Electron Holes Driven by Double Layers and Their Relevance to VLF Saucers

Details Temporal and Spatial Features of Waves and Electron Holes Driven by Double Layers and Their Relevance to VLF Saucers Temporal and Spatial Features of Waves and Electron Holes Driven by Double Layers and Their Relevance to VLF Saucers

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29q..14s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 17, pp. 14-1, CiteID 1833, DOI 10.1029/2002GL015195

Physics

5

Ionosphere: Plasma Waves And Instabilities, Ionosphere: Wave Propagation (6934), Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

Motivated by the observations of electron holes (EHs) strongly correlated with VLF saucers, the basic idea explored here is that when the parallel potential drop in a developing diverging electrostatic shock encounters a localized density cavity, a set of plasma processes are triggered including (i) formation of an upward-moving double layer (DL), (ii) setting up of potential gradients in which counterstreaming of electrons occurs on the DL's high-potential side, and (iii) generation of wave packets containing linear and nonlinear waves, such as the EHs. We specifically examine here the temporal and spatial evolution of such wave packets (WPs) in a one-dimensional Vlasov simulation. If such evolution persists in multi-dimensional treatments, the frequency dependent angular dispersion of the WPs could generate VLF saucers. A rapid growth of the wave packets to large amplitudes within a distance of about hundred Debye lengths gives an effective mechanism for the localization of the source for the saucers. Estimates show that the electrostatic energy stored in a wave packet containing just a few large-amplitude EHs is sufficient to power typical VLF saucer events.

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