LOWFREQUENCY ELECTRIC FIELD MEASUREMENT PROBES ON BOARD INTERCOSMOS- 24- AKTIVEN SATELLITE

the parameters of undisturbed plasma and the characteristics of perturbations in the surrounding plasma caused by the actual impact on it from board of satellite. On board the major satellite, a powerful low-frequency transmitter with major frequency 9.8 kHz was installed, along with a neutral-gas injector: xenone. The spatial-time characteristics of the perturbated area were studied by the satellite-sub-satellite system (including space apparata IK-24 and MAGION-2) whereas the distance between them could be partially controlled. The scientific equipment comprised a complex for measuring low-frequency electric field consisting of the devices: NVK-ONCh, ONCh-2, and ShASh. Six identical probes designed at the Space Research Institute (SRI) of the Bulgarian Academy of Sciences (BAS) acquired the input signal to all devices within the complex. The probes included sensitive elements-spheres with glass-carbon cover interacting with the surrounding plasma, and an input electronic block mounted within the spheres. To provide basis for comparison of the results, the similar electromagnetic wave complex KEM-1 on MAGION-2 satellite was furnished with probes with the same sensitive spherical elements designed and worked out in SRI-BAS