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The paper presents simultaneously a satellite monitoring of plasma density disturbances and quasi-static electric fields on the one hand, and a ground earthquake monitoring, on the other. The INTERCOSMOS-BULGARIA-1300 satellite was launched on 7th August 1981. It had a perigee of 825km, an apogee of 906km and orbit inclination of 81.2°. For satellite’s orbits over sources of earthquakes M⩾5.5 (seismic...
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