Aerospace Instrument-Making Annotation << Back Pressure change dynamics in the unpressurized module of satellites in geostationary orbits A.N. Krylov, L.V. Mishina, N.A. Tchudina, B.A. Rabinovich Pressure gauges with the range from 10-3 to 10-7 mm Hg have been installed in the unpressurized modules of two satellites launched by the same carrier rocket for investigation of pressure change during initial period after the deducing into geostationary orbit. Pressure recording have been carried out during some months since some hours after the satellites launch. In particular, pressure change during cold gas thrusters operation has been investigated. More high sampling frequency allowed detecting the galloping pressure change. The significant change of pressure in the module was recorded at the first switching on of the equipment.