Function of distribution of clouds’ optical thickness over the West Siberian Plain     

Troshkin  D. N.  Kabanov  M. V.  Pavlov  V. E.  Romanov  A. N. 《Doklady Earth Sciences》2011,436(1):113-116

Results of measurements of optical thickness of clouds over the West Siberian Plain taken with the help of the MERIS spectrometer onboard the European satellite ENVISAT are analyzed. The observational data for two summer periods of 2008–2009 are considered. It is found that the distribution function of the clouds’ optical thickness averaged over the territory is best presented as the sum of three logonormal distributions. The contribution from each of them to the total envelope, values of optical thickness logarithms for mode centers, and values of variances are given. It is shown that the distribution parameters are almost unchanged with conditional division of the plain’s territory into four zones. The total number of the studied cases exceeds 10⁶.  相似文献   

CSL-1: chance projection effect or serendipitous discovery of a gravitational lens induced by a cosmic string?     

M. Sazhin  G. Longo  M. Capaccioli  J. M. Alcalá  R. Silvotti  G. Covone  O. Khovanskaya  M. Pavlov  M. Pannella  M. Radovich  V. Testa 《Monthly notices of the Royal Astronomical Society》2003,343(2):353-359

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The North Taymyr ice-marginal zone, Arctic Siberia—a preliminary overview and dating     

Helena Alexanderson  Christian Hjort  Per Mller  Oleg Antonov  Maksim Pavlov 《Global and Planetary Change》2001,31(1-4)

The North Taymyr ice-marginal zone (NTZ) is a complex of glacial, glaciofluvial and glaciolacustrine deposits, laid down on the northwestern Taymyr Peninsula in northernmost Siberia, along the front of ice sheets primarily originating on the Kara Sea shelf. It was originally recognised from satellite radar images by Russian scientists; however, before the present study, it had not been investigated in any detail. The ice sheets have mainly inundated Taymyr from the northwest, and the NTZ can be followed for 700–750 km between 75°N and 77°N, mostly 80–100 km inland from the present Kara Sea coast.The ice-marginal zone is best developed in its central parts, ca. 100 km on each side of the Lower Taymyr River, and has there been studied by us in four areas. In two of these, the ice sheet ended on land, whereas in the two others, it mainly terminated into ice-dammed lakes. The base of the NTZ is a series of up to 100-m-high and 2-km-wide ridges, usually consisting of redeposited marine silts. These ridges are still to a large extent ice-cored; however, the present active layer rarely penetrates to the ice surface. Upon these main ridges, smaller ridges of till and glaciofluvial material are superimposed. Related to these are deltas corresponding to two generations of ice-dammed lakes, with shore levels at 120–140 m and ca. 80 m a.s.l. These glacial lakes drained southwards, opposite to the present-day pattern, via the Taymyr River valley into the Taymyr Lake basin and, from there, most probably westwards to the southern Kara Sea shelf.The basal parts of the NTZ have not been dated; however, OSL dates of glaciolacustrine deltas indicate an Early–Middle Weichselian age for at least the superimposed ridges. The youngest parts of the NTZ are derived from a thin ice sheet (less than 300 m thick near the present coast) inundating the lowlands adjacent to the lower reaches of the Taymyr River. The glacial ice from this youngest advance is buried under only ca. 0.5 m of melt-out till and is exposed by hundreds of shallow slides. This final glaciation is predated by glacially redeposited marine shells aged ca. 20,000 BP (¹⁴C) and postdated by terrestrial plant material from ca. 11,775 and 9500 BP (¹⁴C)–giving it a last global glacial maximum (LGM; Late Weichselian) age.  相似文献   

New data on the Mesozoic gold mineralization in western Aldan (Apsat graben)     

L. B. Makar’ev  L. V. Bylinskaya  V. V. Pavshukov  M. V. Pavlov  A. N. Timashkov 《Doklady Earth Sciences》2006,410(1):1112-1116

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Effect of the zonal E × B plasma drift on the electron number density in the low-latitude ionospheric F region at high solar activity near the December solstice     

A. V. Pavlov  N. M. Pavlova 《Geomagnetism and Aeronomy》2013,53(2):188-197

The variations in the electron number density of the ionospheric F2 layer maximum (NmF2) under the action of the zonal plasma drift in the geomagnetic west-geomagnetic east direction perpendicularly to the electric (E) and geomagnetic (B) fields during a geomagnetically quiet period on December 7, 1989, at high solar activity have been studied based on a three-dimensional nonstationary theoretical model of electron number densities and temperatures in the ionospheric F region. Calculated and measured NmF2 values for 12 low-latitude ionospheric sounding stations have been compared. When the zonal E × B plasma drift is ignored, the NmF2 values become smaller by up to a factor of 3 under nighttime conditions in the low-latitude ionosphere. The average effect of the zonal E × B plasma drift on NmF2 in the low-latitude ionosphere is larger during winter nights than under summer nighttime conditions.  相似文献   

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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The electromagnetic field produced by oscillations of a magnetized incompressible infinitely long cylinder     

G. S. Bisnovatyi-Kogan  S. V. Pavlov 《Astrophysics》2011,54(4):515-537

The oscillations of a magnetized incompressible cylinder with a uniform magnetic field along its axis and the resulting electromagnetic field are studied. Two types of characteristic oscillations, torsional and Alfvén, are found to exist in the linear approximation. In the case of an infinite cylinder with torsional oscillations, no electromagnetic field is generated. In the case of Alfvén oscillations, an electromagnetic field develops around the cylinder with a local flux density that falls off exponentially with radial distance from the axis of the cylinder and has a time average of zero. The results are interpreted physically.  相似文献   

Determining the Double Couple Moment Tensor for Kamchatka Earthquakes from Regional Seismic Waveforms     

Abubakirov  I. R.  Pavlov  V. M. 《Izvestiya Physics of the Solid Earth》2021,57(3):332-347

Izvestiya, Physics of the Solid Earth - Abstract—The digital seismic network in Kamchatka deployed in 2006–2010 provided a fundamental possibility for calculating seismic moment tensor...  相似文献   

Slope Failure Initiation by Seismic Loading from Different Sources     

Kocharyan  G. G.  Besedina  A. N.  Kishkina  S. B.  Pavlov  D. V.  Sharafiev  Z. Z.  Kamenev  P. A. 《Izvestiya Physics of the Solid Earth》2021,57(5):614-626

Izvestiya, Physics of the Solid Earth - Abstract—We present the results of laboratory studies of slope failure criteria by dynamic impulse loading in the range of peak ground velocities (PGV)...  相似文献   

Algorithm for calculating synthetic seismograms in a layered half-space with application of matrix impedance     

V. M. Pavlov 《Izvestiya Physics of the Solid Earth》2013,49(1):24-33

A new algorithm is proposed for calculating the complete synthetic seismograms from a point source in the form of the sum of a single force and a dipole with an arbitrary seismic moment tensor in a plane layered medium composed of homogenous elastic isotropic layers. Following the idea of (Alekseev and Mikhailenko, 1978), an artificial cylindrical boundary is introduced, on which the boundary conditions are specified. For this modified problem, the exact solution (in terms of the displacements and stresses on the horizontal plane areal element) in the frequency domain is derived and substantiated. The unknown depth-dependent coefficients form the motion-stress vector, whose components satisfy the known system of ordinary differential equations. This system is solved by the method that involves the matrix impedance and propagator for the vector of motion, as previously suggested by the author in (Pavlov, 2009). In relation to the initial problem, the reflections from the artificial boundary are noise, which, to a certain degree, can be suppressed by selecting a long enough distance to this boundary and owing to the presence of a purely imaginary addition to the frequency. The algorithm is not constrained by the thickness of the layers, is applicable for any frequency range, and is suitable for computing the static offset.  相似文献