排序方式： 共有67条查询结果，搜索用时 328 毫秒
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A. B. Pushkarev D. C. Gabuzda Yu. N. Vetukhnovskaya V. E. Yakimov 《Monthly notices of the Royal Astronomical Society》2005,356(3):859-871
We present the results of multifrequency (15 + 8 + 5 GHz) polarization Very Long Baseline Array (VLBA) observations of the three BL Lacertae objects 0745+241, 1418+546 and 1652+398 together with 5-GHz VLBI Space Observatory Programme (VSOP) observations of 1418+546 and 1.6- and 5-GHz VSOP observations of the blazar 1055+018. The jets of all these sources have polarization structure transverse to the jet axis, with the polarization E vectors aligned with the jet along the jet spine and 'sheaths' of orthogonal E vectors at one or both edges of the jet. The presence of polarization aligned with the jet near the 'spine' may indicate that the jets are associated with helical B fields that propogate outward with the jet flow; the presence of orthogonal polarization near the edges of the jet may likewise be a consequence of a helical jet B field, or may be owing to an interaction with the ambient medium on parsec scales. We have tentatively detected interknot polarization in 1055+018 with E aligned with the local jet direction, consistent with the possibility that the jet of this source is associated with a helical B field. 相似文献
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A. B. Pushkarev Yu. Yu. Kovalev I. E. Molotov M. B. Nechaeva Yu. N. Gorshenkov G. Tuccari C. Stanghellini X. Hong J. Quick S. Dougherty X. Liu 《Astronomy Reports》2004,48(11):900-908
VLBI observations of several quasars and BL Lacertae objects were carried out at 1.66 GHz in November–December 1999 using six antennas (Medvezh'i Ozera, Svetloe, Pushchino, Noto, HartRAO, and Shanghai). Maps of six sources (0420+022, 0420-014, 1308+326, 1345+125, 1803+784, and DA 193) obtained with milliarcsecond resolution are presented and discussed, together with their broad-band (1–22 GHz) spectra obtained on the RATAN-600 radio telescope at epochs close to those of the VLBI observations. Comparison of the VLBI maps with maps of these sources obtained on standard VLBI networks and with the RATAN-600 quasisimultaneous total-flux measurements indicates the reliability of the results obtained on this Low Frequency VLBI Network and the good efficiency of this network. 相似文献
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Kulikov V. A. Ionicheva A. P. Kolodyazhny S. Yu. Sokolova E. Yu. Pushkarev P. Yu. Yakovlev A. G. 《Izvestiya Physics of the Solid Earth》2022,58(5):642-654
Izvestiya, Physics of the Solid Earth - Abstract—The paper presents results of magnetotelluric sounding performed in the South-Eastern Ladoga Region in 2018–2021 for the purpose of... 相似文献
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Deep magnetotelluric (MT) sounding data were collected and processed in the western part of the East European Craton (EEC). The MT sounding results correspond well with impedances obtained by magnetovariation (MV) sounding on the new geophysical observatory situated not far from the western border of Russia. Inversion based on combined data of both induction soundings let us evaluate geoelectrical structure of the Earth’s crust and upper and mid-mantle at depths up to 2000 km, taking into account the harmonics of 11-year variations. Results obtained by different authors and methods are compared with similar investigations on the EEC such as international projects CEMES in Central Europe and BEAR in Fennoscandia. 相似文献
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Magnetotelluric soundings are frequently carried out on a single profile or on profiles remote from each other. Interpretation
of the obtained data is difficult in the presence of spatially heterogeneous geoelectric structures. We evaluate its capabilities
on the basis of the synthetic data, that correspond to a geoelectric model, which consists of a three-layered section in the
background and three rectangular prisms, differently arranged relative to the profile. Using the simple methods of analysis
of magnetotelluric data, we succeeded in allocating all three heterogeneities over the area that surrounds the profile of
observations. As a result of the fast smoothed-structure 1D and 2D inversion of different components of data, taking into
account their specific features, the depths of the occurrence of anomalies and the order of the values of their electrical
resistivity were evaluated, and the background section was also reconstructed. On this basis, and, also, with the use of a
priori geological-geophysical information, the construction of a 3D model in a more or less broad band around the profile
and its correction with the aid of 3D data inversion are possible. 相似文献
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M. N. Berdichevsky N. S. Golubtsova Iv. M. Varentsov P. Yu. Pushkarev A. K. Rybin E. Yu. Sokolova 《Izvestiya Physics of the Solid Earth》2010,46(8):698-706
The paper presents the results of 2D inversion of deep magnetotelluric (MT) and magnetovariational (MV) soundings along the
Naryn Line. The method of partial (sequential) inversions is used. According to this method, at the first stage, magnetovariation
responses are used for the localization of deep anomalies of electrical conductivity, and then the magnetotelluric sounding
data are invoked to refine the structure of the host medium and the structural details in the upper part of the section. It
is shown that this approach enables one to estimate the informativeness of separate components of the electromagnetic field,
to reduce the distorting influence of the near-surface geoelectric inhomogeneities, and to increase the stability of the final
solution of the inverse problem. 相似文献