The plasma wave system on Phobos

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Abstract
The Phobos-2 spacecraft was inserted in a Mars orbit to rendezvous with one of the two Martian satellites, Phobos, in early 1989. The plasma wave system (PWS) was part of the scientific payload: the purpose of this instrument was to record, for the first time in a Martian environment, the spectra of natural waves with an electric dipole in the frequency range 0-150 kHz and measure the ionospheric plasma density distribution with a Langmuir probe. In-flight data show how the PWS system performed.