Influence of vacuum polarization by the magnetic field on the radiative thermal conductivity of the surface layers of neutron stars     

G. G. Pavlov  D. G. Yakovlev 《Astrophysics》1982,18(1):72-79

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Effect of atomic orientation on absorption lines in a strong magnetic field     

G. G. Pavlov 《Astrophysics》1975,11(1):49-56

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Spectra of radiation from a strongly magnetized plasma     

A. D. Kaminker  G. G. Pavlov  Yu. A. Shibanov 《Astrophysics and Space Science》1983,91(1):167-214

Radiation from an optically thick, tenuous, isothermal and magnetized plasma is considered under conditions typical for X-ray pulsars, in the approximation of coupled diffusion of normal modes. The spectra are calculated of the fluxes and specific intensities of outgoing radiation, their dependences on the plasma densityN, temperatureT and magnetic fieldB are analysed with due regard to the vacuum polarization by a strong magnetic field. Simple analytical expressions are obtained in the limiting cases for the fluxes and intensities. It is shown that atE _B »E _a (E _B =11.6B ₁₂ keV,E _a ?0.1N ₂₂ ^1/2 T ₁ ^?3/4 keV,B ₁₂=B/10¹² G,N ₂₂=N/10²² cm^?3,T ₁=T/10 keV) the magnetic field strongly intensifies the flux and changes its spectrum in the regionE _a ?E ?E _B . AtE ?T the spectrum of the energy flux is almost flat in the region \(\sqrt {E_a E_B } \lesssim E \lesssim E_B \) . For homogeneous plasma without Comptonization the cyclotron line atE?=E _B appears in emission, though in many other cases it may appear in absorption. The vacuum polarization may produce the ‘vacuum feature’ atE?E _W ?13N ₂₂ ^1/2 B ₁₂ ^?1 keV, which, as a rule, appears in absorption. The intensity spectra vary noticeably with the direction of radiation, in particular, at some directions nearB, the spectra become harder than in other directions. Quantization of the magnetic field (E _B >T) strongly increases the plasma luminosity (∝E _B /T for homogeneous plasma). The results obtained explain a number of basic features in the observed X-ray pulsar spectra.  相似文献   

New electron energy transfer rates for vibrational excitation of N2     

A. V. Pavlov 《Annales Geophysicae》1998,16(2):176-182

In this paper we present the results of a study of the electron cooling rate, the production rates of vibrationally excited N₂(v), and the production frequency of the N₂ vibrational quanta arising from the collisions of electrons with unexcited N₂(0) and vibrationally excited N₂(1) molecules as functions of the electron temperature. The electron energy transfer rates for vibrational excitation of N₂ have been calculated and fit to analytical expressions by use of the revised vibrationally excited N₂ cross sections. These new analytical expressions are available to the researcher for quick reference and accurate computer modeling with a minimum of calculations.  相似文献   

Mesoscale distribution and advection of overwintering Calanus finmarchicus off the shelf of northern Norway     

Frank Gaardsted  Meng Zhou  Vladimir Pavlov  Alexey Morozov  Kurt S. Tande 《Deep Sea Research Part I: Oceanographic Research Papers》2010,57(11):1465-1473

Data collected on a cruise in January 2008, using a laser optical plankton counter, conductivity–temperature–depth sensors, and a lowered acoustic Doppler current profiler, was used to study the mesoscale distribution and advection of overwintering Calanus finmarchicus in its deep water winter habitat off the shelf of northern Norway. The overwintering animals were generally located immediately below the Atlantic Water (AW) in Arctic Intermediate Water (AIW), in the 600–1200 m depth range. The depth of the interface between AW and AIW varied considerably in the area and this was clearly reflected in the C. finmarchicus distribution. Maximum abundance varied from about 80 ind m^?3 to more than 200 ind m^?3 at the different stations. Current measurements showed the richness of mesoscazle eddies, with speeds exceeding 70 cm s^?1 at the surface and rapidly decreasing with depth. In the main overwintering layer the eddy features were also clearly seen, but with speeds generally below 20 cm s^?1. C. finmarchicus were found in the whole survey area, but they were not homogeneously distributed. Advection of the copepods resulted in relatively high local rates of change in overwintering C. finmarchicus abundance with mean value of 8% per day in the area. It is clear that mesoscale physical processes greatly contribute to the variability in the abundance of overwintering C. finmarchicus off the shelf of northern Norway. The collected data are also a valuable addition to the generally sparse datasets on the C. finmarchicus winter distribution and the role of the Lofoten basin in the large scale system is also discussed.  相似文献   

The Effect of Environmental Factors on the Cognitive Functions of Cadets at a Military Institute     

Pavlov  K. I.  Syrtsev  A. V.  Mukhin  V. N.  Archimuk  A. N.  Mikheeva  E. A.  Nikolaeva  S. V.  Andieva  N. M.  Kamenskaya  V. G.  Petrenko  M. I. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(10):1465-1487

Izvestiya, Atmospheric and Oceanic Physics - The relevance of studying the influence of environmental factors on the psychophysiological characteristics of cognitive functions of cadets at a naval...  相似文献   

The Lomonosov Ridge as a natural extension of the Eurasian continental margin into the Arctic Basin     

V.A. Poselov  G.P. Avetisov  V.V. Butsenko  S.M. Zholondz  V.D. Kaminsky  S.P. Pavlov 《Russian Geology and Geophysics》2012,53(12):1276-1290

The inregrated geological and geophysical studies carried out in recent years in the Lomonosov Ridge and at its junction with the Eurasian shelf revealed evidence for thinned (reduced) crust in the ridge (20–25 km) and its relationship with shelf structures. We compared the parameters of deep seismic cross-sections of the shelf and Lomonosov Ridge, thus proving the existence of continental crust in the latter. Also, we analyzed the deep structure of the junction between the Lomonosov Ridge and the shelf and established a genetic geologic relationship, with no evidence that the Lomonosov Ridge moved as a terrane with respect to the shelf. In addition, seismological studies independently confirm the relationship between the Lomonosov Ridge and the adjacent shelf.The Lomonosov Ridge is a continental-crust block of a craton. The craton was reworked during the Caledonian tectonomagmatic activity with the formation of a Precambrian–Caledonian seismically unsegmented basement (upper crust) and an epi-Caledonian platform cover. Afterward, the block subsided to bathyal depths in the Late Alpine. This block and the adjacent areas of the Eastern Arctic shelf developed in the platform regime till the Late Mesozoic.  相似文献   

New Paleomagnetic Data on Late Cretaceous Chukotka Volcanics: the Chukotka Block Probably Underwent Displacements Relative to the North American and Eurasian Plates after the Formation of the Okhotsk-Chukotka Volcanic Belt?     

Lebedev  I. E.  Tikhomirov  P. L.  Pasenko  A. M.  Eid  B.  Lhuillier  F.  Pavlov  V. E. 《Izvestiya Physics of the Solid Earth》2021,57(2):232-246

Izvestiya, Physics of the Solid Earth - Abstract—Paleomagnetic studies of several Late Cretaceous volcanic sections of the Okhotsk–Chukotka volcanic belt have been carried out in the...  相似文献   

Secular geomagnetic variations and volcanic pulses in the Permian-Triassic traps of the Norilsk and Maimecha-Kotui provinces     

V. E. Pavlov  F. Fluteau  R. V. Veselovskiy  A. M. Fetisova  A. V. Latyshev 《Izvestiya Physics of the Solid Earth》2011,47(5):402-417

Detailed paleomagnetic studies have shown that the effusive Permian-Triassic traps in the Kotui River valley were formed as the result of volcanic activity, which occurred in the form of volcanic pulses and individual eruptions with net duration of at most 7000–8000 years, excluding the periods of volcanic quiescence. According to the analysis of the paleomagnetic data earlier obtained by Heunemann and his coauthors [2004b] on the Abagalakh and Listvyanka sections in the Norilsk region, those geological units were formed during 25 volcanic pulses and separate eruptions, which all lasted up to 8000 years altogether, whereas the total time of formation (including the periods of volcanic quiescence) exceeded 10000–100000 years for the Norilsk section and was probably a bit shorter for the Kotui section. Comparison of the positions of virtual geomagnetic poles calculated for the Norilsk and the Kotui sections provides no grounds to suggest that these sections were formed at different geological times. The scatter in the positions of the virtual geomagnetic poles (VGP) for the directional groups and individual directions (58 altogether) jointly for the two sections (more than 160 lava flows) indicates that the secular geomagnetic variations at the Permian-Triassic boundary had similar amplitudes to those that occurred in the past 5 Ma.  相似文献   

Paleomagnetism of the Upper Vendian Basu formation of the Bashkirian Meganticlinorium revisited     

I. V. Golovanova  K. N. Danukalov  V. I. Kozlov  V. N. Puchkov  V. E. Pavlov  Y. Gallet  N. M. Levashova  G. S. Sirota  R. R. Khairullin  M. L. Bazhenov 《Izvestiya Physics of the Solid Earth》2011,47(7):623-635

We have carried out paleomagnetic studies of the Upper Vendian sedimentary rocks from the Bashkirian Meganticlinorium (Southern Ural). The rocks were sampled at three localities spread over more than 100 km. Totally, more than 300 samples were collected from about 40 sampling sites. Stepwise thermal demagnetization up to 700°C revealed a stable component of magnetization of either polarity in 25 sites. The fold test and the reversal test for this component are positive, which is usually regarded as a sound argument in favor of the primary origin of magnetization. However, the Basu paleomagnetic pole (longitude 187.3°E, latitude 1.1°N) is located near the Late Ordovician-Early Silurian segment of the apparent polar wander path for Baltica, which might indicate a Paleozoic remagnetization of Vendian rocks. In this work we analyze different interpretations of the obtained results and evaluate the reliability of the Late Riphean and Vendian paleomagnetic data for Baltica.  相似文献