Ability of the CLUSTER/WHISPER Relaxation Sounder to Achieve Thermal Plasma Diagnosis

Details Ability of the CLUSTER/WHISPER Relaxation Sounder to Achieve Thermal Plasma Diagnosis Ability of the CLUSTER/WHISPER Relaxation Sounder to Achieve Thermal Plasma Diagnosis

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0833t&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0833

Physics

2740 Magnetospheric Configuration And Dynamics, 2772 Plasma Waves And Instabilities, 2794 Instruments And Techniques, 6939 Magnetospheric Physics, 7803 Active Perturbation Experiments

Scientific paper

In its passive working mode, the WHISPER (waves of high frequency and sounder for probing of electron density by relaxation)instrument that is aboard the CLUSTER spacecraft behaves like a simple natural wave receiver. Electric field spectra, from about 2 kHz to 80 kHz, are computed onboard and then transmitted to the ground. When active, the WHISPER triggers plasma resonances at characteristic frequencies. It is consequently a radio wave transmitter sending very short pulses at given frequencies, which include the plasma frequency, and a receiver detecting the medium responses. From the frequency locations of the resonances recorded by the WHISPER, the total electron density may be determined from the solar wind down to the inner parts of the Earth's magnetosphere. In some cases, the magnetic field strength may also be given and the hot to cold electron density ratio estimated. The way the resonances are identified and the ability of the WHISPER to perform valuable diagnosis of the plasmas encountered by the CLUSTER spacecraft are highlighted in the current presentation.

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