PHOBOS 1 & 2

Consisting of two probes launched by the Soviet Union to study Mars and its moons Phobos and Deimos. Phobos 1 was launched on 7 July 1988, and Phobos 2 on 12 July 1988. The objectives of the Phobos missions were to : conduct studies of the interplanetary environment; perform observations of the Sun; characterize the plasma environment in the Martian vicinity; conduct surface and atmospheric studies of Mars and study the surface composition of the Martian satellite Phobos.
Only Phobos-2 spacecraft has been inserted in a Mars orbit to rendezvous with the Martian naturel satellite, Phobos, in early 1989.

The Plasma Wave System (PWS), which is a part of the scientific payload (APV-F) was developed jointly by ESA (ESTEC), CNRS (LPC2E) and the UCLA Institute. PWS recorded for the first time, in a Martian environment, plasma and Electric Field Spectrum measurements during two Martian bow shock and measured the ionospheric plasma density distribution with a Langmuir probe.

You can access the data for this mission from the main menu (above) or directly from here.