Investigation of sporadic solar radiowave radiation and Earth ionosphere parameters on the ''Interkosmos-Kopernik 500'' satellite

Results of investigations into inhomogeneities of electron concentration obtained in 1973 by means of '' the Interkosmos-Kopernik-500'' satellite are presented. A high-frequency impedance probe installed at the satellite (3.1 and 15 MHz working frequencies) provided measurement of the electron concentration in ionosphere in the ranges from 103 to 1.8x106 cm-3 and of its inhomogeneities of sizes from 0.5 to 100 km having relative fluctuations ΔN/N >= 3x10-4. Probability P of appearance of the electron concentration inhomogeneities with relative fluctuations √ (ΔN/N)2 >= 0.2% at altitudes of 200-1500 km changes within the limits from 2 to 60-70% for middle and equatorial latitudes. The highest probability of the inhomogeneity appearance in the summer hemisphere (northern hemispere) is observed above the maximum of F2 stratum. Values P at 400-1500 km altitudes at night-time increase from equatorial latitudes to middle ones. At Ksub(p) <= 3 day values √ (ΔN/N)2 at altitudes H > 400 km in the northern (summer) hemisphere are mainly lower than in the southern (winter). During the periods of increased geomagnetic activity (Ksub(p) > 3) the probabilities of the inhomogeneity appearance for the latitudes (middle and equatorial) under investigation change insignificantly as a whole. Power character of the inhomogeneous structures spectra at the altitudes of the F region and partially outer ionosphere at middle, low and equatorial latitudes of the northern and southern hemispheres is their common characteristic feature