MR-20
MR-20 is a Russian (Former Soviet Union) sounding rocket, and is a type of meteorological rocket. It was followed by the MR-30. Launching experiments
In 1985, an MR-20 mclcorological rocket was used from the North Atlantic in a Soviet-Polish experiment adapting an ion gun to inject lithium ions into the ionosphere. In September 1988, 3 MR-20 rocket experiments with artificial "electron hole" formations took place  in the Northern Auroral Zone on the research vessel named "Professor Vize". The launchings of MR-20 rockets were to examine the upper atmospheric and ionospheric characteristics in the Auroral. References

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Sounding rockets of the Soviet Union
Meteorology in the Soviet Union