Correspondence between the ULF wave power spatial distribution and auroral oval boundaries

The world-wide spatial distribution of the wave power in the Pc5 band during magnetic storms has been compared with auroral oval boundaries. The poleward and equatorward auroral oval boundaries are estimated using either the British Antarctic Survey database containing IMAGE satellite UV observations of the aurora or the OVATION model based on the DMSP particle data. The “epicenter” of the spectral power of broadband Pc5 fluctuations during the storm growth phase is mapped inside the auroral oval. During the storm recovery phase, the spectral power of narrowband Pc5 waves, both in the dawn and dusk sectors, is mapped inside the auroral oval or around its equatorward boundary. This observational result confirms previously reported effects: the spatial/temporal variations of the Pc5 wave power in the morning/pre-noon sector are closely related to the dynamics of the auroral electrojet and magnetospheric field-aligned currents. At the same time, narrowband Pc5 waves demonstrate typical resonant features in the amplitude-phase latitudinal structure. Thus, the location of the auroral oval or its equatorward boundary is the preferred latitude for magnetospheric field-line Alfven resonator excitation. This effect is not taken into account by modern theories of ULF Pc5 waves, but it could be significant for the development of more adequate models

Suppression of the dayside magnetopause surface modes

Magnetopause surface eigenmodes were suggested as a potential source of dayside high-latitude broadband pulsations in the Pc5-6 band (frequency about 1–2 mHz). However, the search for a ground signature of these modes has not provided encouraging results. The comparison of multi-instrument data from Svalbard with the latitudinal structure of Pc5-6 pulsations, recorded by magnetometers covering near-cusp latitudes, has shown that often the latitudinal maximum of pulsation power occurs about 2–3° deeper in the magnetosphere than the dayside open-closed field line boundary (OCB). The OCB proxy was determined from SuperDARN radar data as the equatorward boundary of enhanced width of a return radio signal. The OCB-ULF correspondence is further examined by comparing the latitudinal profile of the near-noon pulsation power with the equatorward edge of the auroral red emission from the meridian scanning photometer. In most analyzed events, the “epicenter” of Pc5-6 power is at 1–2° lower latitude than the optical OCB proxy. Therefore, the dayside Pc5-6 pulsations cannot be associated with the ground image of the magnetopause surface modes or with oscillations of the last field line. A lack of ground response to these modes beneath the ionospheric projection of OCB seems puzzling. As a possible explanation, we suggest that a high variability of the outer magnetosphere near the magnetopause region may suppress the excitation efficiency. To quantify this hypothesis, we consider a driven field line resonator terminated by conjugate ionospheres with stochastic fluctuations of its eigenfrequency. A solution of this problem predicts a substantial deterioration of resonant properties of MHD resonator even under a relatively low level of background fluctuations. This effect may explain why there is no ground response to magnetopause surface modes or oscillations of the last field line at the OCB latitude, but it can be seen at somewhat lower latitudes with more regular and stable magnetic and plasma structure

The study the possibility of development of environment safety technology of creating polymer composites in the conditions of small innovative enterprises

The creation of competitive products with a high degree of science intensity is impossible without the use of innovations. However, in their creation process does not always comply with the environmental safety requirements, which leads to negative consequences for the natural environment and human health. This article presents the results of research work group of authors to create wear-resistant polymer composites and their rational use in the processes of parts manufacturing machines running under the impact of the abrasive particles in the absence or limited admission Lube. A method of applying a metal coatings on fibers and powders, in which a metal coating layer with a thickness from 50 nm is applied to the surface by thermal decomposition organometallic compounds vapour using CVD-method, and device for molding polymer composites pressure. Developed innovative polymer composites based on polyamide-6.6 reinforced with metallic fibers and powders used for the manufacture of parts of construction, emergency rescue and other types of equipment. As a result of conducting a comprehensive study reported an increase resources manufactured parts relative serial assembly units. The ecological nature of the creating polymer composites in the conditions of small innovative enterprises was ensured by conducting the process in a closed cycle with the possibility of re-use of the reagents. This eliminated the flow of pollutants into the environment and allowed the implementation of the principles of resource and energy conservation.</jats:p

The algorithm of development safe methods for depositing metallic coatings by CVD-method of organometallic compounds

The CVD-method of organometallic compounds is a universal method of obtaining functional metal coatings on substrates of various chemical composition and configuration. The essence of the method is the evaporation (sublimation) of the organometallic compound in the reactor of the metallization unit and the deposition of metal on the substrate heated to the decomposition temperature of the initial reagent. This article presents the results of research work group of authors to create the algorithm of development safe methods foe depositing metallic coatings by CVD-method. The increase of the industrial safety of metallization is achieved due to automation of the process, equipping the plant for the application of metal coatings with locking and alarm systems. The ecological nature of the CVD-method, in which extremely hazardous substances were used as initial reagents, was ensured by sealing equipment and conducting the process in a closed cycle with the possibility of re-use of the reagents. This eliminated the flow of pollutants into the environment and allowed the implementation of the principles of resource and energy conservation.</jats:p