[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] Consideration is being given to results of evaluation of two-dimensional model of plasmasphere for the possibility of prognostic description of F-layer parameters. It is shown that the global model enables to reproduce main parameters of F-layer at mean and low latitudes under quiet conditions of elevated solar activity with the accuracy, close to one given by the regional models: the average accuracy of reproducibility equals ∼ 20%, h_mF-13%. Parameters f₀F and h_mF at mean and low latitudes are reproduced better under day-time conditions and worse-under riseset conditions

[en] Interplanetary near- Earth disturbance and respective magnetospheric storm originated from interaction of two high-power solar flares with heliospheric current sheet on the 02.-07.03.72, are studied. It is suggested, that this interaction has formed the interplanetary disturbance characteristic properties, that is , - plasma relatively high density within the main shock sheet, in the streamer and inverse magnetohydrodynamic condensation - which, in its turn has promoted generation of magnetospheric storm characteristic properties: Ps6 irregular, auroral magnetic disturbances, Pc5 planetary geomagnetic pulsations, highly-shifted to morning of the western electrojet

[en] Theoretical analysis of peculiarities of subauroral ionosphere F-region electron concentration due to magnetospheric substorm electric fields is presented. For this purpose a simple model of electric field was used in which longitudinal current effect on subauroral ionosphere conducting layer is taken into account . This model represents the band of plasma fast western drift near the equatorial boundary of the auroral oval in the night-time sector with plasma leaking into this band both from medium latitudes and from the auroral oval region. In the morning sector the plasma drift rate is sufficiently lower and is oriented mainly to the east. It is shown that in the band of fast western plasma drift F-layer maximum altitude h_m grows while N_m layer concentration in the maximum drops which is mainly due to the increase of temperature and 0⁺ ion recombination coefficient. In the morning sector h_m practically does not change and N_m grows which leads to formation of a step-like structure of N_m latitude distribution and to a shift of the main ionospheric gap minimum the equator at the rate of about 80 m/s during the first hours of substorm progress

[en] Ionization structure in the auroral ionosphere during the substorm is investigated according to incoherent scattering radar data in Tromsyo. High resolution of measurements by altitude (Δh=3 km) and time (Δ=3 min) allowed one to reveal some new effects in auroral ionosphere reaction to the substorm. Termosphere parameter variation model calculations, conducted for the same conditions, allowed one to evaluate the role of neutral atmosphere in the effects observed. The main investigation result consists in ascertaining three various altitude zones in ionosphere reacting differently to substorm processes. The most interesting result consists in the fact that ionization level at 200-240 km altitudes remains practically unchanged at all the substorm phases. A close connection between auroral ionosphere variations with development of processes in magnetosphere is underlined

[en] Effect of non-stationary electric fields of magnetospheric origin on the night-side mid-latitude protonosphere-ionosphere flux is investigated on the base of analytic solution of continuity non-stationary equation with the right side depending on time, which is derived within the framework of the law of conservation of charged particle quantity in the mid-latitude magnetic force tube. It is found that zonal electric field of eastern direction converts descending protonosphere-ionosphere flux leading to compensation of night flow of plasma from protonosphere. Western direction field increases descending protonosphere-ionosphere flux by an order of magnitude and more depending on disturbing field amplitude and conditions in ionosphere. The flux calculated values agree satisfactoryly with experimental data

[en] Based on numerical solution of diffusion and kinetic equations of solar cosmic ray (SCR) propagation, fast charged particle drift effect in the interplanetary magnetic field on space-time and energy characteristics of SCR distribution function is investigated. It is shown that curved and gradient high-energy proton drifts cause a sufficient change of intensity time profiles and SCR proton energy spectrum softening with E>1 GeV. A conclusion is drawn concerning the fact that the observed delay in the time of high-energy proton entry to the Earth relatively to the flare explosion phase can be explained by the particle drift in the interplanetary magnetic field

[en] Days of large and small amplitudes of geomagnetic field variations are compared using observations conducted in the South America and India and Z variations are shown to increase simultaneously along both sides from magnetic equator. Conclusion is made that general increase of equatorial electrojet current intensity is the source of variation change in certain days. Shifts of current band (with accuracy up to fractions of a degree) are not observed

[en] Regularities, which characterize correlation of solar radio bursts with proton fluxes near the Earth with E>10 MeV (J₁₀), are analyzed concerning 1966-1986 period. It is proved, that intensity of proton flux is determined by power of energy release (by intensity of microwave bursts), by conditions of particle outlet from flare range (by radiowave meter component) by heliographic duration of burst. High dependence of J₁₀ on frequency spectrum of microwave bursts which reflects proton energy spectrum, is determined. Respective functional dependences, which allow to take account of these effects at short-term forecasting of proton flux parameters, are obtained

[en] Using the large-scale tim expansion analytical solutions of electron concentration balance equation in D-region of the ionosphere for pulsed and periodic changes in the rate of ion formatin under the effect of fluxes of precipitating high-energy particles are obtained. Possible effect of disturbances of temperature of nutrals is taken into account. On the basis of model representations the space-time structure of emerging ionospheric disturbances is discussed