Studying large-scale traveling ionospheric disturbances according to the data of oblique-incidence sounding

The morphological features of wave-like ionospheric disturbances with periods of 1–2 h and the spatial extent exceeding 1000 km are studied. Oblique-incidence sounding data of the ionosphere, obtained in eastern Siberia during several continuous monthly experiments on three radio paths from 2006 to 2010, have been used. Large-scale traveling ionospheric disturbances generated during magnetic storms and large-scale wave-like ionospheric disturbances registered during geomagnetically quiet periods are considered. Small-scale ionospheric structures were also observed against a background of large-scale traveling iono-spheric disturbances considered in this study.     

Fluid inclusion studies of the Felbertal scheelite deposit

Fluid inclusion measurements on quartz, scheelite, beryl, fluorite and calcite in the metamorphosed Felbertal scheelite deposit display two main types of fluid inclusions:

1. H₂O-CO₂ fluid inclusions are characterized by variable amounts of CO₂ up to 18 wt.%. They show two or three phases at room temperature. The bulk homogenization temperatures for the inclusions range between +269 °C and +357 °C. The calculated salinities are between 2.2 and 7.8 wt.% NaCl equivalent. For the late CO₂-bearing fluid inclusions a methane component is evident from microthermometrical data (T_mclath >10.0 °C combined with T_mCO₂
2. Aqueous, two-phase fluid inclusions with salinities in the range between 0 and 11 wt.% NaCl equivalent. Their homogenization temperatures are scattered between 100 °C and 360 °C.

Both types of fluid inclusions are of Alpine origin. They do not record the conditions of the original tungsten ore formation in pre-Alpine (Upper Proterozoic) time. However, it was possible to deduce a path for the fluid evolution and the combined ore redeposition during the retrograde Alpine metamorphism and tectonism from microthermometrical and petrographical studies.     

Satellite Monitoring of Sea Ice Cover and Water Parameters for the Caspian Sea

A number of technologies have been developed in the Planeta Research Center for Space Hydrometeorology to provide the satellite monitoring of sea ice cover and water parameters for the Caspian Sea. These technologies produce maps of sea ice, sea ice drift, tracking of near-surface water fluxes, automated classification of ice and water objects, surface wind, and sea surface temperature. Satellite-based products are used for operational hydrometeorology and climate studies of the Caspian Sea environment. A specialized web service for the preparation and comprehensive analysis of satellite data on hydrometeorological and ice conditions in the Caspian Sea was developed to provide information on ice cover characteristics, surface wind, and sea surface temperature.     

Ozone Content over the Russian Federation in the First Quarter of 2018

The review is based on the operation results of the system that monitors the total ozone (TO) in the CIS and Baltic countries and functions in the operational mode at the Central Aerological Observatory (CAO). The monitoring system uses the data from the national network equipped with M-124 filter ozonometers working under the methodological supervision of the Main Geophysical Observatory. The quality of the system functioning is operationally controlled in CAO by the comparison with the observations obtained from the OMI satellite equipment (NASA, USA). Basic TO observation data are generalized for each month of the first quarter of 2018 and for the first quarter. The data of routine observations of surface ozone values in the Moscow region and Crimea are also considered.     

Ozone Content over the Russian Federation in 2017

The review is based on the operation results of the system for total ozone (TO) monitoring in the CIS and Baltic countries functioning in the operational regime at the Central Aerological Observatory (CAO). The monitoring system uses data from the national network equipped with M-124 filter ozonometers being under the methodological supervision of the Main Geophysical Observatory. The quality of the entire system functioning is operationally controlled in CAO through the comparison with the observations obtained from the OMI satellite equipment (NASA, USA). Basic TO observation data are generalized for each month of the fourth quarter of 2017, for the whole fourth quarter, and for the whole year. The data of routine observations of surface ozone values in the Moscow region and Crimea are also considered.     

Physical conditions in the compact double star HD 187399

We present the results of a study of the spectra of the compact double system HD 187399. We have measured and identified lines in the spectrum of the main star and computed their equivalent widths, the central residual intensities, and the electron densities in the atmosphere of the main star and the common envelope of the system. We have constructed the curve of radial velocities of the main star and determined the expansion velocity of the common envelope of the system: v_r =90 km/sec. We have measured the velocity of the interstellar calcium: v_r =–3.5 km/sec. We have established the agreement of the radial velocity curves for the main star obtained in the present paper and in that of Merrill [1]. The comparison enabled us to make the following conjecture: there has been no noticeable loss of mass in the system HD 187399 over the past 35 years, and possibly all that has occurred is a flow of matter from one component toward the other. We note the strong similarity with the Lyrae system.Translated fromAstrofizika, Vol. 38, No. 2, 1995.     

Facies system of the Eastern Barents Sea since the last glaciation to present

Twenty-two sediment cores raised from the central and eastern parts of the Barents Sea have been studied to reconstruct the evolution of the facies system since the Late Weichselian glaciation. Multiproxy records reveal four lithostratigraphic units, which reflect major development stages of paleoenvironments. Age control is provided by 23 AMS ¹⁴C dates for Holocene sections of four cores. Continental moraine deposits of the last glaciation are overlain by proximal glaciomarine facies of the initial deglaciation phase. During this phase, the Barents Sea ice sheet detached from the ground resulting in seawater penetration into troughs, iceberg calving, deposition of IRD and fine-grained glacier meltwater load in newly formed marine basins. The main deglaciation phase is characterized by pulsed sedimentation from various gravity flows resulting in accumulation of distal glaciomarine facies comprising laminated clay and sand sequences with minor IRD. Redistribution of fine-grained suspended matter by bottom currents and brine-induced nepheloid flows combined with biogenic processes and minor ice rafting caused facies diversity of the Holocene marine sediments. The Holocene facies of shelf depressions reflect rather high, but variable productivity responding to climate changes and variations of Atlantic water inflow into the Barents Sea.     

On Developing the Design of the Protective Heat Shield for the <Emphasis Type="Italic">Interhelio-Zond</Emphasis> Spacecraft

This article describes the design of the protective heat shield for the Interhelio-Zond spacecraft, accepted for full-scale engineering development. The material proposed for making the shield’s parts is a carbon-carbon composite material (CCCM). The technology of making and mating of the CCCM shield parts is determined.