Via: hs.fi/english/article/Finn+suspected+of+years+of+espionage+for+Stasi/1135270267893
East Germany was interested in en.wikipedia.org/wiki/EISCAT projects relating to an ionospheric heater and the interaction between the Sun and the Earth. From 1982 till 1989 - 29 scientific reports (half of which were unpublished research reports) where passed.