Further experimental study of the role of wavelets in the hiss bandfor triggering chorus emmissions

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概要

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• The results of detailed spectral analyses and direction finding for ELF data containing simultaneous hiss and chorus have been reported on the basis of the data observed onboard GEOS1 satellite in the outer magnetosphere at a high geomagnetic latitude (Λ〜_25°). A combination of the present results with those from our previous equatorial studies, has yielded the following findings : (1) Each chorus element has a tendency to be originated from the hiss band and is asymptotic to the hiss band. (2) The intensity and occurrence of chorus are closely correlated with the intensity of the underlying hiss. (3) The hiss band exhibits some structures or wavelets (i. e. monochromatic wave components with significant duration), and we notice the existence of the causative wavelet at the foot of each chorus element. (4) There is a tendency that the intensity of wavelet increases with decreasing its duration. Furthermore, when we expect triggering chorus from a wavelet near the upper edge of the hiss band, the duration of the wavelet increases with decreasing its intenisty. (5) Very similar φ (azimuthal angle) values are noticed for both the hiss and chorus, suggesting that both phenomena come from the same source region. These observational facts might lead us to conclude that a wavelet existing near the upper edge of the hiss band is able to generate a chorus emission through coherent wave-particle interaction in the outer magnetosphere as in the case of active VLF wave injection experiments.

• 国立極地研究所の論文

著者

• Parrot Michel

  Laboratoire De Physique Et Chimie De L'environnement

• HAYAKAWA Masashi

  University of Electro-Communications

• LEFEUVRE Francois

  Laboratoire de Physique et Chimie de l'Environnement

• Hattori Katsumi

  Solar-Terrestrial Environmental Laboratory, Nagoya University

• Hayakawa Masashi

  Solar-Terrestrial Environmental Laboratory, Nagoya University

• Lagoutte Dominique

  Laboratoire de Physique et Chimie de l'Environnement

• Hattori Katsumi

  Solar-terrestrial Environmental Laboratory Nagoya University

• Hayakawa M

  Univ. Electro‐communications Chofu‐shi Jpn

• Lefeuvre F.

  Laboratoire De Physique Et Chimie De L'environnement

• Lagoutte Dominique

  Laboratoire De Physique Et Chimie De L'environnement

• Hayakawa Masashi

  Solar-terrestial Environment Laboratory Nagoya University

関連論文

• On the statistical properties of magnetospheric ELF/VLF hiss
• An Imaging Algorithm Using the Bispectrum in Radio Interferometry
• Neural Network System for the Analysis of Transient Phenomena on Board the DEMETER Micro-Satellite (Special Section on Digital Signal Processing)
• Further experimental study of the role of wavelets in the hiss bandfor triggering chorus emmissions
• An experimental study of the role of hiss in the generation of chorus in the outer magnetosphere, as based on spectral analyses and direction finding measurements onboard GEOS 1
• GEOS-1 observation of hiss-triggered chorus emissions in the outer magnetosphere and their generation model
• The wave normal directions of chorus emissions in the outer magnetosphere
• Observation of ionospheric Alfven resonance at a middle latitude station
• Observation of ULF emissions Associated with Earthquakes
• Natural ELF Pulses in the Time Domain : Series with Accelerated Convergence
• The wave distribution functions of plasmaspheric ELF hiss: GEOS 1 observation in the equatorial region
• Crosstalk Analysis of High-Speed Logic Circuits
• Analysis of Field Coupling to Nonuniform Transmission Lines (特集:電磁波の散乱・吸収計測技術)
• On the Estimation of Wave Energy Distribution of Magnetospheric VLF Waves at the Ionospheric Base with Ground-Based Multiple Electromagnetic Field Components
• Whistler-triggered VLF emissions in the electron slot and inner radiation belt, as observed at Moshiri (L=1.6)

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