observations which were carried out on the Prognoz-9 and “Mir” orbital station (OS) missions.

Monitor observations of temporal phenomena during the “Prognoz 9” mission and “GRIF” experiment on board “Mir” station
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The Prognoz 9 and “Mir” OS GRIF experiments.
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Both, Prognoz-9 and GRIF experiments use wide-field, hard X-ray spectrometers, which provide long-term observations of periodic process sources. Although the observational conditions were specific in the each experiment, the main X-ray instruments as well as the technique of the periodic sources revealing were quite similar. The observations of galactic sources in hard X-rays (10-200 keV) were made in 1983-84 during the complex experiment on a high-apogee ($\sim 720000$ km) satellite Prognoz-9 with a wide field of view (FOV) ($\sim 45^o$ FWHM) scintillator spectrometer ($\sim 40 cm^2$ effective area) [@Kud85]. The X-ray instrument was installed in such a way that the center of its field of view, averaged over the satellite’s rotation period ($\sim 120 s$), coincided with the spin axis which pointed in the solar direction every 5-7 days. According to the experiment conditions sky areas adjacent to the ecliptic plane ($\pm 25^o$ - for instrument beam FWHM) were observed and slow ($1^o/day$ on average) scanning along the ecliptic 