On the modern approach to the problem of detecting hazardous celestial bodies     

B. M. Shustov 《Kinematics and Physics of Celestial Bodies》2016,32(5):218-222

The problem of detecting dangerous (in the sense of a collision with the Earth) celestial bodies of natural origin and the modern concept of building a system of detection of such bodies are discussed. The concept includes two items: remote detection of large (>50 m) hazardous objects providing warning time of several tens of days, which is sufficient to allow the active counteraction and detection of hazardous bodies larger than 10 m in near-Earth space providing warning time of few hours, which is sufficient to issue a warning and to carry out mitigation activities. Some examples of this approach and prospects of the international cooperation are discussed.  相似文献   

Diagnosing the Source Region of a Solar Burst on 26 September 2011 by Using Microwave Type-III Pairs     

B. L. Tan  M. Karlický  H. Mészárosová  L. Kashapova  J. Huang  Y. Yan  E. P. Kontar 《Solar physics》2016,291(8):2407-2418

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Performance of large area x-ray proportional counters in a balloon experiment     

J. Roy  P. C. Agrawal  D. K. Dedhia  R. K. Manchanda  P. B. Shah  V. R. Chitnis  V. M. Gujar  J. V. Parmar  D. M. Pawar  V. B. Kurhade 《Experimental Astronomy》2016,42(2):249-270

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Temporal Offsets Between Maximum CME Speed Index and Solar,Geomagnetic, and Interplanetary Indicators During Solar Cycle 23 and the Ascending Phase of Cycle 24     

A. Özgüç  A. Kilcik  K. Georgieva  B. Kirov 《Solar physics》2016,291(5):1533-1546

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Turnover Frequency in Solar Microwave Bursts with an Extremely Flat Optically Thin Spectrum     

Q. W. Song  H. Nakajima  G. L. Huang  B. L. Tan  Y. Huang  Z. Wu 《Solar physics》2016,291(12):3619-3635

Four microwave bursts have been selected from the Nobeyama Radio Polarimeter (NoRP) observations with an extremely flat spectrum in the optically thin part and a very hard spectral index between 0 and ?1 in the maximum phase of all bursts. It is found that the time evolution of the turnover frequency is inversely proportional to the time profiles of the radio flux in all bursts. Based on the nonthermal gyrosynchrotron theory of Ramaty (Astrophys. J. 158, 753, 1969), the local magnetic field strength and the electron spectral index are calculated uniquely from the observed radio spectral index and the turnover frequency. We found that the electron energy spectrum is very hard (spectral index 1?–?2), and the time variation of the magnetic field strength is also inversely proportional to the radio flux as a function of time in all bursts. Hence, the time evolution of the turnover frequency can be explained directly by its dependence on the local magnetic field strength. The high turnover frequency (several tens of GHz) is mainly caused by a strong magnetic field of up to several hundred gauss, and probably by the Razin effect under a high plasma density over \(10^{10}~\mbox{cm}^{-3}\) in the maximum phase of these bursts. Therefore, the extremely flat microwave spectrum can be well understood by the observed high turnover frequency and the calculated hard electron spectral index.  相似文献   

Power Spectrum Density of Stochastic Oscillating Accretion Disk     

G.?B.?Long  J.?W.?Ou  Y.?G.?ZhengEmail author 《Journal of Astrophysics and Astronomy》2016,37(2):10

In this paper, we employ a stochastic oscillating accretion disk model for the power spectral index and variability of BL Lac object S5 0716+714. In the model, we assume that there is a relativistic oscillation of thin accretion disks and it interacts with an external thermal bath through a friction force and a random force. We simulate the light curve and the power spectrum density (PSD) at (i) over-damped, (ii) critically damped and (iii) under-damped cases, respectively. Our results show that the simulated PSD curves depend on the intrinsic property of the accretion disk, and it could be produced in a wide interval ranging from 0.94 to 2.05 by changing the friction coefficient in a stochastic oscillating accretion disk model. We argue that accretion disk stochastic oscillating could be a possible interpretation for observed PSD variability.  相似文献   

White Dwarf Stars as Polytropic Gas Spheres     

M. I. Nouh  A. S. Saad  W. H. Elsanhoury  A. A. Shaker  B. Korany  T. M. Kamel 《Astrophysics》2016,59(4):540-547

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On the negative correlation between solar activity and solar rotation rate     

V. N. Obridko  B. D. Shelting 《Astronomy Letters》2016,42(9):631-637

An increase in solar activity is shown to be accompanied by a decrease in solar rotation rate. This effect has been established from various indices; it manifests itself as cyclic and secular variations in the global magnetic field, in the observations of the magnetic field of the Sun as a star, and in the observations of the solar corona. Some possible explanations of this effect are discussed.  相似文献   

Depositional Environments and Paleogeographic Evolution during the Formation of Upper Paleozoic Terrigenous Rocks in Taimyr     

Shishlov  S. B.  Dubkova  K. A. 《Lithology and Mineral Resources》2021,56(6):509-522

Lithology and Mineral Resources - Upper Paleozoic sections in Taimyr comprise genetic rock complexes of different zones: deep-water shelf; offshore transition zone; shoals, deltas, and beaches of...  相似文献   

Peri-Gondwanan Blocks in the Structure of the Southern and Southeastern Framing of the East European Platform     

Kuznetsov  N. B.  Romanyuk  T. V. 《Geotectonics》2021,55(4):439-472

Geotectonics - Synthesis of the results of U–Pb dating of detrital zircons (dZr) from the Uppermost Precambrian–Phanerozoic strata of the southern and southeastern framing of the East...  相似文献