ANOMALOUS BEHAVIOR OF PLASMA PARAMETERS AS OBSERVED BY THE INTERCOSMOS-24-SATELLITE PRIOR TO THE IRANIAN EARTHQUAKE OF 20 JUNE 1990

Measurements of plasma parameters were made by the Intercosmos 24 sate llite at altitudes between 2300 km and 2500 km in the interval of 16 t o 12 hours prior to the initial shock of the destructive Iranian earth quake of 20 June 1990 (210009 UT, 37-degrees-N, 49.4-degrees-E, M=6.4) , and before the strong aftershock of 21 June 1990 (090214 UT, M=5.8). The anomalous behaviour of the light ionospheric ions H+ and He+ and the cold electron temperature was observed over a wide region of the N orthern Hemisphere before the earthquake. Sudden increases of energeti c electron fluxes were observed over the Asian zone near the epicentre . These changes appear to be a part of the solid Earth - near space in teraction occurring during the preparatory stage of the great seismic event.