Вестник Кольского научного центра РАН. 2010, №2.

V.C. Roldugin ON DIURNAL VARIATION OF COSMIC RAY INTENSITY The morphology of diurnal variations of cosmic ray intensity is studied by data of 17 stations for 1985 and 1986. Theses variations are most intensive at geomagnetic latitudes between 40° - 60° and are controlled by magnetic local time. Their maximum occurs at 1300 - 1500 MLT . The amplitude is highly changeable and reaches to 0.8%, duration of its strong variations is equal to 1-3 weeks. According to the Apatitian neutron monitor data for 1985-2000, these periods are characterized reliably by Kp, Ap, Ae and WN indices increase, but the correlation coefficients are not too large, they are about of 0.20 - 0.22. The most likely reason of these variation is magnetosphere asymmetry. Keywords: cosmic rays, diurnal variation, anisotropy, magnetosphere A.A. Mochalov, A.B. Pashin GENERATION FEATURES OF THE ARTIFICIAL MAGNETIC PULSATIONS IN PC1 RANGE AT SPITSBERGEN A series of heating experiments have been carried out on 2006 at SPEAR heating facility at Spitsbergen. The experiments on modulated ionosphere heating were mainly aimed at injection of the artificial MHD waves into upper ionosphere. Ground based observations of the artificial magnetic pulsations near the heating site provided by the Polar Geophysical Institute at Barentsburg show some interesting features. Moreover, observations of the ionosphere response to the ionosphere heating are not clear in the frame of the conventional model of their generation. Frequently for two events with very similar ionospheric condition artificial emissions may be observed or not observed. This peculiarity was named as a sporadic nature of the artificial pulsations. Series of the heating experiments on the pulsation excitation at Spitsbergen give more features to the sporadic nature. Probability of their excitation is rather small (10%) and independent from local magnetic activity, although the artificial amplitude should depend strictly on the ionospheric electric field magnitude. The event study of the convection velocity and electron density also shows its insignificant correlation with the emission intensity. Moreover magnitude of artificial pulsations is independent from variations of ionospheric currents. New ideas are needed to fit the experimental findings with the numerical model. Keywords: artificial magnetic pulsations, ionosphere heating, ionosphere. M.I. Beloglazov, V.V. Pchelkin, A.N. Vasiljev, A.I. Voronin Q-TYPE ELF BURSTS AS A PHENOMENON REFLECTING PROPERTIES OF THE GLOBAL RESONATOR: PHYSICAL ASPECTS OF AUTOMATED IDENTIFICATION The problems of distinguishing Q-type ELF bursts in measurements of horizontal magnetic component of the natural electromagnetic noise in the Shuman resonance frequency range are studied. The distinguished signals allow estimating characteristics of the Earth-ionosphere cavity. Based on the developed algorithm of waveform recognition, automatic search for Q-type bursts in the experimental dataseries obtained at the high-latitude observatory of Lovozero has been carried out. The resonance character of the Q-type bursts is demonstrated. The possibility of Q-type bursts identification under magnetically disturbed conditions is pointed out. Keywords: Q-type bursts, noise magnetic field, 1-st Schumann resonance, global resonator, wave forms recognition, automatic selection, magnetosphere disturbances. V.B. Belakhovsky, V.V. Safargaleev, O.I. Yagodkina RESPONSE OF MORNING AURORAS AND COSMIC NOISE ABSORPTION TO NEGATIVE SOLAR WIND PRESSURE PULSE. A case study of response of particle precipitation to negative impulse of solar wind dynamic pressure is presented. The study was performed using the data of PGI all-sky camera at Barentsburg observatory (arch. Spitsbergen) and imaging riometer IRIS located in Northern Finland. Two stages of the response were found. At first, the reduction of cosmic noise absorption (CNA) in the center of the auroral zone and the decay of the auroras near the pole boundary of the auroral oval were observed. The second stage was started in 10 minutes and characterized by the appearance of new bright forms near the pole boundary of the auroral oval. No significant changes in the CNA were observed at this time. We connect such reaction of the auroras and CNA during the first stage with propagation of the front of MHD disturbance through the source of precipitating particles in the magnetosphere. We explain the changes in the aurora dynamics at the second stage by the large-scale reconfiguration of the magnetosphere which was manifested in the ionosphere as a change of position of dawn vortex of ionosphere convection in the region of the optical observations. Keywords: solar wind, magnetosphere, ionosphere, aurora, cosmic noise absorption. 112