The basic 9bjectives have been 'described .in detail in the •, previous reports (Report I-: VI). The aspects. presently under.. study are following below: ••- ..-, a) Identificationof. stratospheric intrusions by observation of the time variation in the concentration of cosmogenic radionuclides. For this purpose daily aerosol sampling at the station Zugsfitze. with. s'ubseqUent' , , : , chemical progessing for the determination of the dctivity of the radionuclides Be7,
The balance of the tropospheric ozone is investigated consid-•' ering the ozone sources with emphasis on tropospheric pollutants and stratospheric-tropospheric exch~nge processes. An observation during the course of our solar-terrestrial
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