[4] The sounding of the F region and the topside ionosphere was conducted at a frequency of 158 MHz with the incoherent scatter radar of the Institute of the Ionosphere. The radar is located in the vicinity of Kharkov. The geographic and geomagnetic coordinates are 49.6oN, 36.3oE and 45.7oN, 117.8oE, respectively. The radar description was presented in a series of papers [see, e.g., Akimov et al., 2002; Grigorenko et al., 2003b; Taran, 1979, 2001]. The radar is equipped with a zenith double-reflector parabolic antenna with the diameter of 100 m that is one of the largest in the world. The antenna effective area, gain and half-power beam width are about 3700 m2, 12,700 and 1o, respectively. The measurements of ionospheric parameters were conducted by the sounding pulses with the circular polarization, the repetition frequency of 24.4 Hz, and the height resolution of 20 (10) and 120 km in the height ranges 100-550 and 200-1500 km, respectively. The radar has a two-channel structure. The pulse power of the transmitting facility is 2.4-3.6 MW depending on the operation mode. The noise temperatures of the two-channel receiving facility and the system as a whole are 150-240 and 570-1320 K, respectively. The bandwidth of the receiving facility filters is 5.5-9.5 kHz. Output signals from the receiver quadrature channels come to two fast operating programmed two-channel correlators that are connected to the local network of the measuring-computing system of online initial processing of IS signals.
[5] Ionosonde "Basis" operated in the mode of vertical sounding with the pulses of 100 m s duration and repetition frequency of 50 Hz. The height-frequency characteristics (ionograms) were used to determine the critical frequency foF2 of the F2 layer and for a calibration of the electron density profile obtained by the IS technique.
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