Enhancement of the electron gyroharmonics amplitude close to the plasma frequency observed by the WHISPER/CLUSTER experiment. - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2006

Enhancement of the electron gyroharmonics amplitude close to the plasma frequency observed by the WHISPER/CLUSTER experiment.

Résumé

The Wave of HIgh frequency and Sounder for Probing of Electron density by Relaxation WHISPER performs the measurement of the electron density on the four satellites of the CLUSTER project The two main purposes of the WHISPER experiment are to record the natural waves and to make a diagnostic of the electron density using the sounding technique The various working modes and the fourier transforms calculated on board provide a good frequency resolution obtained in the bandwidth 2-80 kHz and a well instrumental adaptability to determine the electron density in various plasma In this presentation we will focus on the plasmaspheric region where the plasma frequency Fpe is above the electron gyrofrequency Fce In active mode the spectrum exhibits various resonance frequencies as upper hybrid frequency Fuh Bernstein mode Fqn electron gyroharnomics nFce and plasma frequency To extract the electron density it is necessary to clearly identify and name these various resonances This task could be difficult when several electron populations and thermal effects exist In previous works Trotignon et al 1986 it has been shown that the plasma frequency is usually close to the maximum amplitude of the spectrum which allows the frequency domain where to look for the plasma frequency resonance to be determined In this work we will show that the amplitude of the electron gyroharmonics depend strongly of the frequency distance Fpe --nFce In addition we will present a simular study for the Bernstein s resonances
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Dates et versions

hal-00154603 , version 1 (14-06-2007)

Identifiants

  • HAL Id : hal-00154603 , version 1

Citer

Jean-Louis Rauch, Pierrette Décréau, Jean-Gabriel Trotignon, F. Lemdani-Mazouz, S. Grimald, et al.. Enhancement of the electron gyroharmonics amplitude close to the plasma frequency observed by the WHISPER/CLUSTER experiment.. 36th COSPAR, Beijing, July 16-23, 2006, 2006, Beijing, China. ⟨hal-00154603⟩
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