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The Whisper Relaxation Sounder Onboard Cluster: A Powerful Tool for Space Plasma Diagnosis^{1, 2} around the Earth

Décréau, P. M. E.; Canu, P.; Darrouzet, F. +3 more

The WHISPER relaxation sounder that is onboard the four CLUSTER spacecraft has as its main scientific objectives to monitor the natural waves in the 2 kHz-80 kHz frequency range and, mostly, to determine the total plasma density from the solar wind down to the Earth's plasmasphere. To fulfill these objectives, the WHISPER uses the two long double …