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1.
We present results of investigations into chromospheric velocity oscillations in sunspots, carried out at the Sayan Solar
Observatory. It is shown that the “chevron” structures in the space-time diagrams demonstrate wavetrain properties. Such structures
are indicators of a propagating wave process and they are typical of many sunspots. In the authors’ opinion, three-minute
umbral oscillations are not the source of running penumbral waves (RPW). It is very likely that umbral oscillations and RPW
initially propagate along different magnetic field lines. We explain the decrease in RPW propagation velocity and frequency
in the outer penumbra, as compared with the inner, by the combined action of different frequency modes. To better reveal the
properties of these modes, frequency filtering was used. Our measurements of the RPW (five-minute mode) wavelength and RPW
propagation velocity in different sunspots vary from 12″ to 30″ and from 28 to 60 – 70 km s−1 correspondingly. 相似文献
2.
In the food clods of the mass species of macrobenthos of the Gryaznaya Inlet, nonstructured matter plays a great role. We identify this matter as derivates from plant tissues, which are the products of their external metabolism and degradation, with associated microorganisms. This way, the near-shore community considered is supported by a detrital trophic web. This feature distinguishes it from the similar community of the near-Atlantic waters that is based on a pasture web, at least as far as the bivalve mass species are concerned. The groups of the near-shore species of Gryaznaya Inlet separated by a cluster analysis are identified as consortia, combined by the biogeochemical conditions (edifice factor), which can hardly be analyzed at present. 相似文献
3.
A. A. Zhamaletdinov A. N. Shevtsov E. P. Velikhov A. A. Skorokhodov V. E. Kolesnikov T. G. Korotkova P. A. Ryazantsev B. V. Efimov V. V. Kolobov M. B. Barannik P. I. Prokopchuk V. N. Selivanov Yu. A. Kopytenko E. A. Kopytenko V. S. Ismagilov M. S. Petrishchev P. A. Sergushin P. E. Tereshchenko B. V. Samsonov M. A. Birulya M. Yu. Smirnov T. Korja Yu. M. Yampolski A. V. Koloskov N. A. Baru S. V. Poljakov A. V. Shchennikov G. I. Druzhin W. Jozwiak J. Reda Yu. G. Shchors 《Izvestiya Atmospheric and Oceanic Physics》2015,51(8):826-857
4.
Gudkov A. V. Kolobov V. V. Tarakanov S. S. Tolstikhin I. N. 《Doklady Earth Sciences》2019,488(2):1193-1195
Doklady Earth Sciences - 相似文献
5.
A quasi-geostrophic model for synoptic eddy evolution in a confined oceanic area is examined. The numerical scheme is based on the combination of spline collocation, splitting, and Fourier series expansion by the dynamic operator's eigenfunctions over the vertical. The functions and their derivatives are approximated with cubic splines in a basis constituted by B-spline functions. A series of experiments focusing on eddy transformation were conducted. The acquired data confirmed the inference regarding the oscillatory nature of the energy exchange between the primary eddy and the secondary ones and showed how vortical formations affect the currents. The evidence obtained indicates that, vertically, the pattern of eddy propagation is complicated.Translated by Vladimir A. Puchkin. 相似文献
6.
A. A. Zhamaletdinov A. N. Shevtsov T. G. Korotkova Yu. A. Kopytenko V. S. Ismagilov M. S. Petrishev B. V. Efimov M. B. Barannik V. V. Kolobov P. I. Prokopchuk M. Yu. Smirnov S. A. Vagin M. I. Pertel E. D. Tereshchenko A. N. Vasil’ev V. F. Grigoryev M. B. Gokhberg V. I. Trofimchik Yu. M. Yampolsky A. V. Koloskov A. V. Fedorov T. Korja 《Izvestiya Physics of the Solid Earth》2011,47(1):2-22
The paper addresses the technique and the first results of a unique experiment on the deep tensor frequency electromagnetic sounding, the Fennoscandian Electrical conductivity from results of sounding with Natural and Controlled Sources (FENICS). In the experiment, Energy-1 and Energy-2 generators with power of up to 200 kW and two mutually orthogonal industrial 109- and 120-km-long power transmission lines were used. The sounding frequency range was 0.1–200 Hz. The signals were measured in the Kola-Karelian region, in Finland, on Svalbard, and in Ukraine at distances up to 2150 km from the source. The parameters of electric conductivity in the lithosphere are studied down to depths on the order of 50–70 km. A strong lateral homogeneity (the one-dimensionality) of a geoelectric section of the Earth’s crust is revealed below depths of 10–15 km. At the same time, a region with reduced transverse crustal resistivity spread over about 80 000 square kilometers is identified within the depth interval from 20 to 40 km. On the southeast the contour of the anomaly borders the zone of deepening of the Moho boundary down to 60 km in Central Finland. The results are compared with the AMT-MT sounding data and a geodynamic interpretation of the obtained information is carried out. 相似文献
7.
A. A. Zhamaletdinov M. S. Petrishchev A. N. Shevtsov V. V. Kolobov V. N. Selivanov M. B. Barannik E. D. Tereshchenko V. F. Grigoriev P. A. Sergushin E. A. Kopytenko M. A. Biryulya A. A. Skorokhodov O. A. Esipko R. V. Damaskin 《Izvestiya Physics of the Solid Earth》2013,49(6):844-858
Electromagnetic soundings with the fields of natural (magnetotelluric (MT), and audio magnetotelluric (AMT)) and high-power controlled sources have been carried out in the region of the SG-6 (Tyumen) and SG-7 (En-Yakhin) superdeep boreholes in the Yamal-Nenets autonomous district (YaNAD). In the controlled-source soundings, the electromagnetic field was generated by the VL Urengoi-Pangody 220-kV industrial power transmission line (PTL), which has a length of 114 km, and ultralow-frequency (ULF) Zevs radiating antenna located at a distance of 2000 km from the signal recording sites. In the soundings with the Urengoi-Pangody PTL, the Energiya-2 generator capable of supplying up to 200 kW of power and Energiya-3 portable generator with a power of 2 kW were used as the sources. These generators were designed and manufactured at the Kola Science Center of the Russian Academy of Sciences. The soundings with the Energiya-2 generator were conducted in the frequency range from 0.38 to 175 Hz. The external generator was connected to the PTL in upon the agreement with the Yamal-Nenets Enterprise of Main Electric Networks, a branch of OAO FSK ES of Western Siberia. The connection was carried out by the wire-ground scheme during the routine maintenance of PTL in the nighttime. The highest-quality signals were recorded in the region of the SG-7 (En-Yakhin) superdeep borehole, where the industrial noise is lowest. The results of the inversion of the soundings with PTL and Zevs ULF transmitter completely agree with each other and with the data of electric logging. The MT-AMT data provide additional information about the deep structure of the region in the low-frequency range (below 1Hz). It is established that the section of SG-6 and SG-7 boreholes contains conductive layers in the depth intervals from 0.15 to 0.3 km and from 1 to 1.5 km. These layers are associated with the variations in the lithological composition, porosity, and fluid saturation of the rocks. The top of the poorly conductive Permian-Triassic complex is identified at a depth of about 7 km. On the basis of the MT data in the lowest frequency band (hourly and longer periods) with the observations at the Novosibirsk observatory taken into account, the distribution of electric resistivity up to a depth of 800 km is reconstructed. This distribution can be used as additional information when calculating the temperature and rheology of the lithosphere and upper mantle in West Siberia. The results of our studies demonstrate the high potential of the complex electromagnetic soundings with natural and controlled sources in the study of deep structure of the lithosphere and tracing deep oil-and-gas-bearing horizons in the sedimentary cover of the West Siberian Platform within the Yamal-Nenets autonomous district. 相似文献
8.
Running waves at the chromospheric level (Hα) in sunspots are studied. Propagating 3-min oscillations are shown to be typical
of many spots. Presumably, they propagate along the vertical magnetic-field lines. Their propagation speed is measured. According
to our analysis, the 5-min oscillations propagating in the penumbral chromosphere are not a continuation of the 3-min umbral
oscillations. The wavelength and propagation speed of the running penumbral waves are determined. 相似文献
9.
Sokol E. V. Deviatiiarova A. S. Kokh S. N. Reverdatto V. V. Artemyev D. A. Kolobov V. Yu. 《Doklady Earth Sciences》2019,489(1):1326-1329
Doklady Earth Sciences - Marbles of the Kochumdek complex contain pyrrhotite, rasvumite, alabandine, würtzite, galena, and acanthite. The diversity of sulfides is caused by efficient crystal... 相似文献
10.
M. B. Barannik A. N. Danilin B. V. Efimov V. V. Kolobov P. I. Prokopchuk V. N. Selivanov Yu. A. Kopytenko A. A. Zhamaletdinov 《Seismic Instruments》2010,46(3):207-212
The high-voltage rectifier is described developed for the Energy-2 generator, with a capacity of 200 kW in which a step-up
power transformer is used as a converter. The Energy-2 generator is intended for solving problems of precision deep electromagnetic
monitoring of seismoactive regions of the Earth’s crust to find earthquake precursors. Theoretical investigation and numerical
simulation of the high-voltage rectifier are carried out and parameters of its elemental base are optimized. All the high-voltage
rectifier components, heat sink, and forced cooling system were manufactured on the basis of the developed documentation.
The high-voltage rectifier was successfully tested as part of the“Energy-2 generator in August 2009 during the “FENIKS-2009”
experiment. 相似文献