Nonlinear evolution of the atmosphere above a seismic epicenter: 1. Analytical estimates     

V. A. Pavlov  S. V. Lebedev 《Geomagnetism and Aeronomy》2013,53(6):794-803

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Observations of global oscillations of the sun in the SOKOL experiment onboard the CORONAS-PHOTON satellite     

N. I. Lebedev  V. D. Kuznetsov  Yu. D. Zhugzhda  S. I. Boldyrev 《Solar System Research》2011,45(3):200-205

The helioseismological experiment onboard the CORONAS-PHOTON satellite is intended for the study of characteristics and the internal structure of the Sun using the solar eigenmodes spectrum obtained by the measurement of fluctuations of the solar radiation intensity. This experiment is the continuation of investigations of solar global oscillations started onboard artificial satellites CORONAS-I and CORONAS-F. Measurements of fluctuations of the solar radiation intensity in seven optical ranges—from the near ultraviolet to infrared spectral regions—are carried out by the solar photometer SOKOL (SOlnechnye KOLebaniya (Solar Oscillations)) developed at IZMIRAN. Over an instrument operation period of more than 9 months, a large volume of the scientific information (more than 500 MB) has been obtained. The primary processing of obtained data was performed, and spectra of fluctuations of the solar radiation intensity were constructed. On the basis of part of the processed information obtained by the photometer SOKOL, and data of the experiment DIFOS (Differential Oscillations of the Sun) onboard the artificial satellite CORONAS-F, the dependence of the relative amplitude of oscillations on the wavelength of the observation was determined.  相似文献   

Experimental Studies of Magnetically Driven Plasma Jets     

F. Suzuki-Vidal  S. V. Lebedev  S. N. Bland  G. N. Hall  G. Swadling  A. J. Harvey-Thompson  G. Burdiak  P. de Grouchy  J. P. Chittenden  A. Marocchino  M. Bocchi  A. Ciardi  A. Frank  S. C. Bott 《Astrophysics and Space Science》2011,336(1):41-46

We present experimental results on the formation of supersonic, radiatively cooled jets driven by pressure due to the toroidal magnetic field generated by the 1.5 MA, 250 ns current from the MAGPIE generator. The morphology of the jet produced in the experiments is relevant to astrophysical jet scenarios in which a jet on the axis of a magnetic cavity is collimated by a toroidal magnetic field as it expands into the ambient medium. The jets in the experiments have similar Mach number, plasma beta and cooling parameter to those in protostellar jets. Additionally the Reynolds, magnetic Reynolds and Peclet numbers are much larger than unity, allowing the experiments to be scaled to astrophysical flows. The experimental configuration allows for the generation of episodic magnetic cavities, suggesting that periodic fluctuations near the source may be responsible for some of the variability observed in astrophysical jets. Preliminary measurements of kinetic, magnetic and Poynting energy of the jets in our experiments are presented and discussed, together with estimates of their temperature and trapped toroidal magnetic field.  相似文献   

SYSTEMS MAPPING OF THE PHYSICAL-GEOGRAPHIC PROCESS IN A MARINE ENVIRONMENT     

V. L. Lebedev 《地理信息系统科学与遥感》2013,50(2):156-165

An analog to the (terrestrial) physical-geographical process, the concept of boundary surfaces, is elaborated and developed quantitatively for analyzing the diversity of marine ecosystems. Interactions among physical-chemical components of the oceans, and the adjacent coastal, atmospheric, and ocean bottom environments, provides a model used in the study and mapping of heterogeneous “waterscapes.” A series of tables identifies interacting geographic features commonly used as indices for mapping. Sample maps prepared for the Barents Sea and Indian Ocean demonstrate possible results of a systems approach. Translated from: Izvestiya, Vsesoyuznogo geograficheskogo obshchestva, 1985, No. 3, pp. 201-208.  相似文献   

Geochronology of miocene volcanism in the northern part of the Lesser Caucasus (Erusheti Highland, Georgia)     

Vl. A. Lebedev  I. V. Chernyshev  G. T. Vashakidze  M. V. Gudina  A. I. Yakushev 《Doklady Earth Sciences》2012,444(1):585-590

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Convergent boundaries and related igneous and metamorphic complexes in caledonides of Central Asia     

I. K. Kozakov  E. B. Sal’nikova  V. V. Yarmolyuk  A. M. Kozlovsky  V. P. Kovach  P. Ya. Azimov  I. V. Anisimova  V. I. Lebedev  G. Enjin  Ch. Erdenejargal  Yu. V. Plotkina  A. M. Fedoseenko  S. Z. Yakovleva 《Geotectonics》2012,46(1):16-36

Fragments of the crystalline complexes where Vendian metamorphism of moderate and elevated pressure predated Early Paleozoic metamorphism have been established in the accretionary-collisional domain of the eastern segment of the Central Asian Foldbelt (Early Caledonian superterrane of Central Asia). The geodynamic setting of the Vendian (??560?C570 Ma) South Hangay metamorphic belt located in the junction zone of the Baydrag Block and the Late Riphean (??665 Ma) ophiolite complex of the Bayanhongor Zone is considered. The origination of this belt was related to the formation of the convergent boundary in the framework of the Zabhan microcontinent about 570 Ma ago. At the same time, an island-arc complex was formed in the paleo-oceanic domain. Metamorphism of elevated pressure indicates that Vendian structures with sufficiently thick continental crust were formed in the framework of the continental blocks. Vendian metamorphism is also established in the Tuva-Mongolia Massif and the Kan Block of the Eastern Sayan. These data show that the Late Baikalian stage predated the evolution of the Early Caledonian superterrane of Central Asia. The development of its accretionary-collisional structure was accompanied by Late Cambrian-Early Ordovician low-pressure regional metamorphism. Granulite-facies conditions were reached only at the deep levels of the accretionary-collisional edifice. The outcrops of crystalline complexes in the southern framework of the Caledonian paleocontinent are regarded as fragments of the Early Paleozoic Central Mongolian metamorphic belt.  相似文献   

Experimental approbation of the method for increasing the accuracy of an underwater object positioning system     

V. A. Akulichev  Yu. N. Morgunov  A. A. Golov  A. A. Azarov  M. S. Lebedev 《Doklady Earth Sciences》2013,449(2):460-463

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Age of the Khangai batholith and challenge of polychronic batholith formation in Central Asia     

V. V. Yarmolyuk  A. M. Kozlovsky  E. B. Sal’nikova  I. K. Kozakov  A. B. Kotov  V. I. Lebedev  G. Eenjin 《Doklady Earth Sciences》2013,452(2):1001-1007

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Spatial migration of magmatic activity within the Caucasian segment of the Alpine belt in the early neogene under the conditions of geotectonic setting change: Isotope-geochronological data     

V. A. Lebedev  V. N. Volkov  A. K. Sagatelyan  I. V. Chernyshev 《Doklady Earth Sciences》2013,448(2):225-231

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First results of radio observations of the sun and powerful discrete radio sources using the Irkutsk Radar     

R. V. Vasil’ev  D. S. Kushnarev  L. K. Kashapova  V. P. Lebedev  A. V. Medvedev  N. I. Nevedimov  K. G. Ratovskii 《Astronomy Reports》2013,57(11):872-881

Using the Irkutsk Incoherent Scattering Radar, it is demonstrated that the high sensitivity of such radars, which are usually used for studies of the Earth’s ionosphere, also enables their use in a passive mode for observations of astronomical radio sources. Observations of solar flares accompanied by coronal mass ejections and of quasi-stationary radio sources on the Sun have been carried out. In addition, scintillations of several of the brightest discrete radio sources (Cygnus A, Cassiopeia A, and the Crab Nebula) have been studied over several months. These data can also be useful for studies of the ionosphere and interplanetary space.  相似文献