[en] Dynamics of the European secular variation focus of geomagnetic field T in 1977-1988 is considered. The secular peculiarities in 1980-1979 is noted. An assumption concerning a possible sharp secular variation T in Europe and current 22. solar activity cycle is stated

[en] Variations of electron density and electron temperature in the subauroral ionosphere during the magnetospheric storm on April 3-4, 1979 are analyzed according to the data of the ''Interkosmos-19'' satellite. The sharpest displacement of a middle latitude fall-through to the equator is primarily caused by the turn-over of Bsub(z)-component of the interplanetary magnetic field (IMF) to the South. This displacement has taken place immediately after the turn-over of IMF Bsub(z)-component to the South in the day-time with a approximately 2 h delay in the night-time. and a approximately 40 min delay in around midnight. The general amplitude of fall-trhrough displacement is approximately 18. 20 and 17 deg for the day- and night-time and around midnight. The minimum latitude of the fall-through equals 56, 48 and 43 deg in the day- and night-time and midnight respectively. The saturation in IMF equatorial displacement is observed in the dark time of the day near the maximum of IMF Bsub(z)-component and Ksub(p) index

[en] The variations of neutron component intensity of cosmic rays in the period precedino. the entry of the Earth into a high-speed (HSF) flux of the solar wind of a nonburst origin are investigated. Statistical data processing for the HSF series for 1973-1974 has shown that before entry of the Earth into HSF the growth of cosmic ray flux with the amplitude of approximately 0.4% is observed

[en] The character of behaviour of the daily variation of cosmic rays (CR) in high-speed streams of the solar wind is investigated. For calculating CR daily variation the Deep River station neutron component data are used. By hour-long CR inten= . sity values by the method of harmonic analysis amplitudes and phases of the first and second harmonics have been calculated for 5 days before the entry of the Earth into the stream and for 5 days of the Earth passage through the stream. It is shown that the amplitudes of the first and second harmonics right after the entry of the Earth into the stream grow no. ticeably whereas the phases of the first and second harmonics vary nobiceably only on the second day

[en] The nature of the convection generated by quasi-viscous interaction of the solar wind with the magnetospheris investigated. The antisolar convection is projected into the ionosphere. The resulting ionospheric convection has a form of two jets localized along polar-cap morning and evening limits. The ets are closed up through the auroral zone and middle latitudes. In the polar-cap practically there is no convection. At the jet boundaries longitudinal current layers flow

[en] Two kinds of long-period p and lp geomagnetic pulsations near the equatorial boundary of the dayside polar cusp are analyzed. Generation of np pulsations is shown to be observed in the range of closed force lines of the geomagnetic field at latitudes of 0=74-76 deg. Excitation of most long-period lp pulsations takes place in the range of the dayside polar cusp and in the polar cap (on open force lines) at latitudes PHI>=77-80 deg

[en] The dissipation of meteor trace as the function of ionic composition and electric field is investigated numerically. Critical values of electric field E₁ and E₂ are determined. At E<=E₁ the dissipation process is similar to the diffusion one; lifetimes are proportional to diffusion coefficient. At E₁< E< E₂ - the dissipation process falls into two phases with different character of lifetime dependence on meteor trace mass. At E>E₂ lifetime does not depend on the electric field

[en] Passage of Alfven wave across the strong shock wave front is considered. Equations, describing the passage at arbitrary orientation of vectors of flux rate, external magnetic field and the wave vector of incident wave were obtained. Coefficients of incident wave transformation to MHD - waves of different types, depending on orientation of external magnetic field and the wave vector of incident wave were calculated

[en] Problem concerning origination of gradient-drift instability in the current-plasma at concentration gradient arbitrary direction is considered by means of quasi-hydrodynamic equation. Relations for frequency and increment of gradient-drift vibrations are obtained in the local approximation. The criterion is obtained for account of electromagnetic effects. Evaluations are reduced to the dimension values of heterogeneities, drawn along geomagnetic field, which are significant when considering electromagnet effects, for parameters of ionosphere F-region

[en] Structure of magnetic and electric fields within the magnetopause vicinity is investigated theoretically. The model, where solar wind is presented as the conducting liquid with σ conductivity, is used. Plasma flow is derived from the equation of continuity and condition, where solar wind rate normal component V_n=0 at the magnetopause in the incompressible liquid approximation. Electric and magnetic fields in the magnetopause vicinity are formed due to the three processes joint action: transport of the interplanetary magnetic field freezed in solar wind plasma; penetration of the interplanetary magnetic field into the magnetosphere; magnetosphere diffusion in the transition layer. Magnetopause thickness and field structure in its vicinity are determined by single dimensionless parameter Rm, which is Reynolds magnetic number. Ampere force, which affects plasma, is calculated on the basis of the solution obtained in kinematic approximation. Beyond the magnetopause, where the freezing-in approximation is adequate, this force induces flux braking; near, where diffusion prevails, it accelerates plasma