Space Research: Gravitoinertial Instruments     

O. N. Andreev  V. B. Dubovskoi  I. I. Kalinnikov  A. V. Kalyuzhny  V. I. Leontyev  A. B. Manukin  S. S. Obydennikov  V. G. Pshenyanik 《Seismic Instruments》2018,54(5):557-561

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Physical Libration of the Moon: An Extended Problem     

Zagidullin  A. A.  Usanin  V. S.  Petrova  N. K.  Nefedyev  Yu. A.  Andreev  A. O.  Gudkova  T. V. 《Astronomy Reports》2020,64(12):1093-1106

Astronomy Reports - The work is devoted to the study of the physical libration of the Moon. Interest in the traditional topic related to the rotation of the Moon is stirred up by the activity of...  相似文献   

Development of Methods for Navigational Referencing of Circumlunar Spacecrafts to the Selenocentric Dynamic Coordinate System     

Andreev  A. O.  Nefedyev  Yu. A.  Demina  N. Yu.  Nefediev  L. A.  Petrova  N. K.  Zagidullin  A. A. 《Astronomy Reports》2020,64(9):795-803

Astronomy Reports - The initial form of present-day space optical observations contain considerable geometrical and brightness distortions. This problem can be solved based on geometrical...  相似文献   

The κ-Cygnid Meteor Shower and Its Relationship with Near-Earth Asteroids     

Sergienko  M. V.  Sokolova  M. G.  Nefedyev  Yu. A.  Andreev  A. O. 《Astronomy Reports》2020,64(12):1087-1092

Astronomy Reports - This study is focused on the relationships between the κ-Cygnid meteor shower and different groups of asteroids crossing the Earth’s orbit (the so-called near-Earth...  相似文献   

Pulsations of optical radiation during the flare of YZ CMi occurred on February 9, 2008     

B. E. Zhilyaev  Yu. T. Tsap  M. V. Andreev  A. V. Stepanov  Yu. G. Kopylova  R. E. Gershberg  M. N. Lovkaya  A. V. Sergeev  I. A. Verlyuk  K. O. Stetsenko 《Kinematics and Physics of Celestial Bodies》2011,27(3):154-159

One of the most powerful and long-lived flares on the active red dwarf YZ CMi is considered. The flare was observed in the U band at the Terskol Peak Observatory on February 9, 2008. During the formation of the flare over the course of 30 seconds, the flare-induced stellar luminosity increased and became more than 180 times the preflare value. The total duration of the flare was approximately one hour. At the flare maximum, quasi-periodic pulsations having a specified period of approximately 11 s, an initial modulation depth of 5.5%, and an exponential damping time of 29 s were discovered using wavelet analysis. Assuming that the pulsations were caused by fast magnetohydrodynamic oscillations of a flare loop, the following parameters were determined in the region of energy release using coronal seismology methods: plasma concentration (2 × 10¹⁰ cm⁻³), temperature (3 × 10⁷ K), and magnetic field strength (0.015 T).  相似文献   

Lagrangian study of temporal changes of a surface flow through the Kamchatka Strait     

Sergey V. Prants  Andrey G. Andreev  Michael Yu. Uleysky  Maxim V. Budyansky 《Ocean Dynamics》2014,64(6):771-780

Using Lagrangian methods, we analyze a 20-year-long estimate of water flux through the Kamchatka Strait in the northern North Pacific based on AVISO velocity field. It sheds new light on the flux pattern and its variability on annual and monthly time scales. Strong seasonality in surface outflow through the strait could be explained by temporal changes in the wind stress over the northern and western Bering Sea slopes. Interannual changes in a surface outflow through the Kamchatka Strait correlate significantly with the Near Strait inflow and Bering Strait outflow. Enhanced westward surface flow of the Alaskan Stream across the 174°E section in the northern North Pacific is accompanied by an increased inflow into the Bering Sea through the Near Strait. In summer, the surface flow pattern in the Kamchatka Strait is determined by the passage of anticyclonic and cyclonic mesoscale eddies. The wind stress over the Bering basin in winter–spring is responsible for eddy generation in the region.  相似文献   

A photometric study of the polar MT draconis in 2005–2009     

A. M. Zubareva  E. P. Pavlenko  M. V. Andreev  S. V. Antipin  N. N. Samus’  A. V. Sergeev 《Astronomy Reports》2011,55(3):224-229

We have obtained data on various brightness states of the polar MT Dra over five years of observations, including the first multicolor photometry for this close binary. We confirm the known orbital period, which has remained constant over 17 years, which is unusual for cataclysmic binaries. Our observations in October 2006 demonstrated a transition of the polar to its low brightness state within one day.  相似文献   

The structure and age of the Baikal granitoid massif: New evidence for early Baikalian events in the Baikal-Muya mobile belt     

E. Yu. Rytsk  A. B. Kotov  A. A. Andreev  V. V. Yarmolyuk  S. D. Velikoslavinskii  V. P. Kovach  A. F. Makeev  A. M. Fedoseenko 《Doklady Earth Sciences》2013,453(2):1205-1208

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Quasi-harmonic faraday-rotation fluctuations of radio waves when sounding the outer solar corona     

A. I. Efimov  L. N. Samoznaev  V. E. Andreev  I. V. Chashei  M. K. Bird 《Astronomy Letters》2000,26(8):544-552

A statistical analysis of the Faraday-rotation fluctuations (FRFs) of linearly polarized radio signals from the Helios 1 and Helios 2 spacecraft shows that the FRF time power spectra can be of three types. Spectra of the first type are well fitted by a single power law in the range of fluctuation frequencies 1–10 mHz. Spectra of the second type are a superposition of a power law and two quasi-harmonic components with fluctuation frequencies of about v₁=4 mHz (fundamental frequency) and v₂=8 mHz (second harmonic). Spectra of the third type exhibit only one of the two quasi-harmonic components against the background of a power law. The spectral density of the quasi-harmonic components can be represented by a resonance curve with a fairly broad [Δυ ≈ (0.5–1.3)υ_1,2] distribution relative to the v=v_{1, 2} peak. The intensity of the quasi-harmonic FRF has a radial dependence that roughly matches the radial dependence for the background FRF, while their period at the fundamental frequency is approximately equal to the period of the wellknown 5-min oscillations observed in the lower solar atmosphere. The fluctuations with 5-min periods in FRF records can be explained by the presence in the outer corona of isolated trains of Alfvén waves generated at the base of the chromosphere-corona transition layer and by acoustic waves coming from deeper layers.  相似文献   

Asteroids observed at the GPO,La Silla     

H. Debehogne  G. V. Andreev  V. A. Shefer 《Astronomische Nachrichten》1995,316(1):29-34

Continuing the observational programme, which was started in 1976 at the European Southern Observatory (ESO), La Silla, by Debehogne a lot of new photographic plates was obtained during February-March in 1989. These plates are used for the determination of positions of asteroids selected by „Ephemerides of Minor Planets for 1989”︁, edited by the Institute of Theoretical Astronomy of Leningrad (ITA) in 1988. They permit also discoveries of new celestial bodies as well as reidentifications of lost or badly observed asteroids during the last years. For the part treated here, the examination of the plates has revealed nine asteroids not mentioned in the Russian Ephemerides or in the disquettes as fournished by the Minor Planet Centre (MPC) of SAO. Seven were present in the ITA source.  相似文献