Polarization and brightness of the blazar S5 0716+714 in 1991–2004     

V. T. Doroshenko  N. N. Kiselev 《Astronomy Letters》2017,43(6):365-387

We investigate the photometric and polarimetric behavior of the blazar S5 0716+714 based on the observations carried out in 1991–2004 at the 125-cm Crimean Astrophysical Observatory telescope (AZT11) with a photopolarimeter that allows simultaneous polarization and brightness measurements to be made in the U BV RI bands. We also provide the U BV photometry for the blazar obtained in 2000–2009 with a 60-cm telescope at the Crimean Station of the Sternberg Astronomical Institute. The pattern of flux variability and the correlation between the brightness, color, and polarization variations have been investigated. In this time interval the blazar showed a significant brightness and polarization variability similar to noise processes.  相似文献   

Polarimetry of the Asteroid (599) Luisa: a New Barbarian     

Lupishko  D. F.  Kiselev  N. N.  Karpov  N. V. 《Solar System Research》2020,54(1):44-48

Solar System Research - The results of polarimetric observations of the asteroid (599) Luisa carried out on the same type of aperture photoelectric polarimeters of the 2.6-m reflector of the...  相似文献   

Influence of the Spectral Dependence of Refractive Index on the Polarimetric Properties of Ice Particles     

Petrov  D. V.  Zhuzhulina  E. A.  Kiselev  N. N. 《Solar System Research》2020,54(1):70-83

Solar System Research - Water ice is widespread in the Solar System. Computer simulation of light scattering by ice particles designed to interpret the observational data should take into account...  相似文献   

Polarimetry of Saturn’s satellite Rhea     

S. V. Zaitsev  N. N. Kiselev  V. K. Rosenbush  S. V. Kolesnikov 《Kinematics and Physics of Celestial Bodies》2015,31(6):281-285

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Analysis of accumulation factor of cesium 137 in bottom sediments of surface water bodies     

A. L. Krylov  A. V. Nosov  V. P. Kiselev 《Russian Meteorology and Hydrology》2011,36(1):33-39

The accumulation factor of radionuclides in river and water body bottom sediments K is an integral magnitude and depends on many parameters. With a two-compartment migration model (water-bottom sediments) an analytical relation is established for the conditions of a steady-state process of radioactive transfer for calculating K depending on the known parameters of radionuclide migration in the aquatic environment. With a reference to cesium 137 the calculated factor value is found for silty sediments in rivers and water bodies under characteristic summertime parameters of migration. The numerical analysis showed that the coefficient of radionuclide distribution in the water-suspension system and turbidity influence mostly the K value for cesium 137. For the practical use of this coefficient, a scheme of its correction is suggested depending on turbidity. An example of its practical use for calculating cesium 137 in water is considered. The calculated and measured volumetric activity values are intercompared.  相似文献   

Investigation of parameterization effect on the methane flux estimation from the regional climate model of the main geophysical observatory for the territory of Russia     

E. D. Nadezhina  E. K. Mol’kentin  A. A. Kiselev  A. A. Semioshina  I. M. Shkol’nik 《Russian Meteorology and Hydrology》2011,36(6):371-382

An effect is studied of parameterization method of the methane flux from the wetlands of Siberia on the results of model estimates carried out using the one-dimensional model of heat transfer in the soils. The results of computations of the regional climate model of the Main Geophysical Laboratory are used as the input data of this model. The computation estimates of seasonal methane flux variations at certain observation points are compared with the measured values of the methane flux. It is shown that the optimal choice of methane flux parameterization at the use of the grid climate model data as the forcing should correspond to the conditions of prevailing subgrid natural complex of one or another type of wetlands. A spatial distribution of methane emission intensity under conditions of the present-day climate and at the end of the 21st century is obtained. The analysis revealed that the methane fluxes in Western Siberia will increase by 1.5–2.5 times by the end of the 21st century.  相似文献   

Simulation of changes in global ozone and atmospheric dynamics in the 21st century with the chemistry-climate model SOCOL     

V. A. Zubov  E. V. Rozanov  I. V. Rozanova  T. A. Egorova  A. A. Kiselev  I. L. Karol’  V. Schmutz 《Izvestiya Atmospheric and Oceanic Physics》2011,47(3):301-312

The solar climate ozone links (SOCOL) three-dimensional chemistry-climate model is used to estimate changes in the ozone and atmospheric dynamics over the 21st century. With this model, four numerical time-slice experiments were conducted for 1980, 2000, 2050, and 2100 conditions. Boundary conditions for sea-surface temperatures, sea-ice parameters, and concentrations of greenhouse and ozone-depleting gases were set following the IPCC A1B scenario and the WMO A1 scenario. From the model results, a statistically significant cooling of the model stratosphere was obtained to be 4–5 K for 2000–2050 and 3–5 K for 2050–2100. The temperature of the lower atmosphere increases by 2–3 K over the 21st century. Tropospheric heating significantly enhances the activity of planetary-scale waves at the tropopause. As a result, the Eliassen-Palm flux divergence considerable increases in the middle and upper stratosphere. The intensity of zonal circulation decreases and the meridional residual circulation increases, especially in the winter-spring period of each hemisphere. These dynamic changes, along with a decrease in the concentrations of ozone-depleting gases, result in a faster growth of O₃ outside the tropics. For example, by 2050, the total ozone in the middle and high latitudes approaches its model level of 1980 and the ozone hole in Antarctica fills up. The superrecovery of the model ozone layer in the middle and high latitudes of both hemispheres occurs in 2100. The tropical ozone layer recovers far less slowly, reaching a 1980 level only by 2100.  相似文献   

Composition and sources of magmatism of the middle paleozoic Vilyui rift area and the problem of combination of its basic and kimberlitic derivates     

K. N. Egorov  A. I. Kiselev  V. V. Yarmolyuk  A. V. Nikiforov 《Doklady Earth Sciences》2011,436(1):76-82

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Comet C/2002 T7 (LINEAR): Polarimetric and photometric studies     

V. K. Rosenbush  F. P. Velichko  N. N. Kiselev  S. F. Velichko  N. M. Shakhovskoy  Yu. S. Efimov  K. A. Antonyuk  S. V. Kolesnikov  D. N. Shakhovskoy 《Solar System Research》2006,40(3):230-238

We present the results of polarimetric and photometric observations of dynamically new comet C/2002 T7 (LINEAR) at phase angles from 6° to 26°. During the observations, the comet was at a distance of 2.7–1.3 AU from the Sun and 1.7–2.0 AU from the Earth. The aperture polarimetry was made with the 2.6-m Shain telescope and the 1.25-m AZT-11 telescope of the Crimean Astrophysical Observatory and with the 0.7-m telescope of the Astronomical Institute of the Kharkiv National University during the period from November 21, 2003, to February 21, 2004. The wideband UBVRI and WRC (λ7228/1142 Å) filters and the narrowband GC (λ5260/56 Å) filter were used. The photometric observations of the comet were carried out on February 21, 2004, with narrowband filters isolated the BC (λ4845/65 Å) and RC (λ6840/90 Å) continuum and the C₂ emission (λ5140/90 Å). The phase-angle dependence of linear polarization of the comet has been obtained, and its parameters, such as the minimal polarization P _min = ?1.63%, the phase angle of the minimal polarization α_min = 10.6°, the inversion angle α_inv = 22.7°, and the slope of the phase curve at the inversion angle h = 0.24% per degree, were found. From the photometric observations, the following quantities have been obtained: the column density of molecules C₂ in the line of sight logN (C₂) = ?9.15 mol/cm² and their production rate log Q (C₂) = 27.11 mol/s, the spectral gradient of reflectivity for the dust S′(BC, RC) ≈ 3%/1000 Å, and the dust production parameter Afρ equal to 371 and 273 cm for the blue and red continuum ranges, respectively. According to these results, the physical parameters of comet C/2002 T7 are close to the average characteristics of typical dusty comets.  相似文献   

Lithological–geochemical,petromagnetic, and paleoecological characteristics of the Campanian–Selandian sedimentation conditions in the Ul’yanovsk–Saratov basin     

R. R. Gabdullin  E. N. Samarin  A. V. Ivanov  N. V. Badulina  V. I. Kiselev  A. Yu. Yurchenko  T. I. Nigmadzhanov 《Moscow University Geology Bulletin》2016,71(6):395-406

The results of a complex study of the Upper Cretaceous carbonate section in the quarry of the cement plant of the town of Sengilei (Ul’yanovsk district) are presented. The Lower Paleocene cyclic opoka member is described. The formation conditions of the Upper Cretaceous cyclic and cryptocyclic, as well as Lower Paleocene cyclic, rocks are interpreted for the first time on the basis of lithological, petrographic, petromagnetic, geochemical, and paleoecological methods. The cyclicity was formed due to dilution cycles under climate fluctuation and eustatic variations, which were caused by eccentricity cycles of the Earth’s orbit. These cycles are identified in the cryptorhythmic lanceolata sequence of the Lower Maastrichtian rocks.  相似文献