Georgii Pavlovich Leonov (on the centenary of his birth)     

D. Yu. Pushcharovskii  E. E. Milanovskii  A. M. Nikishin  N. V. Koronovskii  O. V. Yapaskurt  I. S. Barskov  D. P. Naidin  V. T. Frolov  D. I. Panov 《Moscow University Geology Bulletin》2008,63(5):350-351

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Magnetosheath Interaction with the High Latitude Magnetopause     

S. Savin  A. Skalsky  L. Zelenyi  L. Avanov  N. Borodkova  S. Klimov  V. Lutsenko  E. Panov  S. Romanov  V. Smirnov  YU. Yermolaev  P. Song  E. Amata  G. Consolini  T. A. Fritz  J. Buechner  B. Nikutowski  J. Blecki  C. Farrugia  N. Maynard  J. Pickett  J. A. Sauvaud  J. L. Rauch  J. G. Trotignon  Y. Khotyaintsev  K. Stasiewicz 《Surveys in Geophysics》2005,26(1-3):95-133

We present both statistical and case studies of magnetosheath interaction with the high-latitude magnetopause on the basis of Interball-1 and other ISTP spacecraft data. We discuss those data along with recently published results on the topology of cusp-magnetosheath transition and the roles of nonlinear disturbances in mass and energy transfer across the high-latitude magnetopause. For sunward dipole tilts, a cusp throat is magnetically open for direct interaction with the incident flow that results in the creation of a turbulent boundary layer (TBL) over an indented magnetopause and downstream of the cusp. For antisunward tilts, the cusp throat is closed by a smooth magnetopause; demagnetized ‘plasma balls’ (with scale ∼ few R_E, an occurrence rate of ∼25% and trapped energetic particles) present a major magnetosheath plasma channel just inside the cusp. The flow interacts with the ‘plasma balls’ via reflected waves, which trigger a chaotization of up to 40% of the upstream kinetic energy. These waves propagate upstream of the TBL and initiate amplification of the existing magnetosheath waves and their cascade-like decays during downstream passage throughout the TBL. The most striking feature of the nonlinear interaction is the appearance of magnetosonic jets, accelerated up to an Alfvenic Mach number of 3. The characteristic impulsive local momentum loss is followed by decelerated Alfvenic flows and modulated by the TBL waves; momentum balance is conserved only on time scales of the Alfvenic flows (1/f_A ∼12 min). Wave trains at f_A∼1.3 mHz are capable of synchronizing interactions throughout the outer and inner boundary layers. The sonic/Alfvenic flows, bounded by current sheets, control the TBL spectral shape and result in non-Gaussian statistical characteristics of the disturbances, indicating the fluctuation intermittency. We suggest that the multi-scale TBL processes play at least a comparable role to that of macro-reconnection (remote from or in the cusp) in solar wind energy transformation and population of the magnetosphere by the magnetosheath plasma. Secondary micro-reconnection constitutes a necessary chain at the small-scale (∼ion gyroradius) edge of the TBL cascades. The thick TBL transforms the flow energy, including deceleration and heating of the flow in the open throat, ‘plasma ball’ and the region downstream of the cusp.  相似文献   

Magma fragmentation dynamics: experiments with analogue porous low-strength material     

Mikhail Alidibirov  Vsevolod Panov 《Bulletin of Volcanology》1998,59(7):481-489

 Experiments were conducted on the fragmentation of analogue low-strength porous material (plastiprin) by rapid decompression in a shock-tube-type apparatus. The porous samples (length=365 mm, cross-section dimensions 40×40 mm) pressurized by air to pressures up to 0.9 MPa, were rapidly decompressed to 0.1 MPa. Rapid decompression of samples caused fragmentation and ejection of the fragmentation products into a large volume tank. The process of analogue material fragmentation was documented using high-speed cinematography and dynamic pressure measurements. The duration of the fragmentation event is significantly shorter than that of the ejection event. The fragmentation of material precedes the acceleration of fragments. As a result of fragmentation, sub-parallel fractures are generated. The characteristic fragment size decreases as the initial pressure differential increases. The ejected fragments obtain velocities of 60 m/s. The mechanisms of material fragmentation during unloading and fragmentation wave propagation are discussed. The experimental results provide insight into the fragmentation dynamics of highly viscous magmas in which brittle failure at high strain rate is possible. Received: 23 July 1997 / Accepted: 23 November 1997  相似文献   

Studying seasonal variations in carbonaceous aerosol particles in the atmosphere over central Siberia     

E.?F.?MikhailovEmail author  S.?Yu.?Mironova  M.?V.?Makarova  S.?S.?Vlasenko  T.?I.?Ryshkevich  A.?V.?Panov  M.?O.?Andreae 《Izvestiya Atmospheric and Oceanic Physics》2015,51(4):423-430

The results of 2-year (2010–2012) measurements of the concentrations of organic carbon (OC) and elemental carbon (EC), which were taken at the Zotino Tall Tower Observatory (ZOTTO) Siberian background station (61° N, 89° E), are given. Despite the fact that this station is located far from populated areas and industrial zones, the concentrations of OC and EC in the atmosphere over boreal forests in central Siberia significantly exceed their background values. In winter and fall, high concentrations of atmospheric carbonaceous aerosol particles are caused by the long-range transport (~1000 km) of air masses that accumulate pollutants from large cities located in both southern and southwestern regions of Siberia. In spring and summer, the pollution level is also high due to regional forest fires and agricultural burning in the steppe zone of western Siberia in the Russian–Kazakh border region. Background concentrations of carbonaceous aerosol particles were observed within relatively short time intervals whose total duration was no more than 20% of the entire observation period. In summer, variations in the background concentrations of OC closely correlated with air temperature, which implies that the biogenic sources of organic-particle formation are dominating.  相似文献   

Variations of contemporary glaciation of the northern slope of the Greater Caucasus in the 20th century and the forecast of its degradation in the 21st century     

P. M. Lur’e  V. D. Panov 《Russian Meteorology and Hydrology》2014,39(4):254-259

In the 20th century on the territory of the northern slope of the Greater Caucasus the number of glaciers increased by 245 (or by 19%) and the glaciation area decreased by 849 km² (or by 52.6%). It is revealed that the increase in the number of glaciers occurred as a result of the disintegration of larger glaciers into smaller parts and as a result of the cutoff of their tributaries, and the decrease in the glaciation area, due to the negative balance of the mass of glaciers. The length of all glaciers decreased by 128–3520 m during that period. It is demonstrated that in 1970–2011 the decrease in the glaciation area occurred with the rate being smaller than in 1895–1970 by 1.6 times that is associated with more favorable climatic conditions in 1970–2011. According to the computations of the climate model by the Main Geophysical Observatory (moderate scenario) for 2011–2099, average annual air temperature will increase by 1.06–2.70°C and the annual amount of precipitation, by 2.09–2.77%. According to the results of computations, the glaciation area in 2011–2099 will reduce by 585 km² or by 76.5%. In the region under consideration, glaciation with the area of 180 km² which will be concentrated only in the central part of the Greater Caucasus will maintain by 2099. The glacier runoff will decrease by 74–80%.  相似文献   

Catalog of cosmic gamma-ray bursts from the KONUS experiment data     

E. P. Mazets  S. V. Golenetskii  V. N. Ilyinskii  V. N. Panov  R. L. Aptekar  Yu. A. Guryan  M. P. Proskura  I. A. Sokolov  Z. Ya. Sokolova  T. V. Kharitonova  A. V. Dyatchkov  N. G. Khavenson 《Astrophysics and Space Science》1981,80(1):3-83

Data are presented on the temporal structure, fluxes, energy spectra and coordinates of the sources of gamma-ray bursts detected in the KONUS experiment on Venera 11 and Venera 12 space probes in the period September 1978 to May 1979. The statistical distributions of gamma bursts in duration, intensity, and peak power, as well as the distribution of the burst sources over the celestial sphere presented are based on the updated KONUS information obtained until February 1980.  相似文献   

An iterative method for simultaneously computing the synthesis of light and heavy elements     

D. K. Nadyozhin  I. V. Panov 《Astronomy Letters》2001,27(7):440-444

We propose an iterative algorithm for computing the synthesis of heavy elements through the rapid capture of neutrons (r-process) and, at sufficiently high temperatures, protons by simultaneously using two distinct computer codes. One of the codes describes the kinetics of nuclear reactions between light and intermediate chemical elements, which are the source of free neutrons and protons used by the second code to synthesize heavy elements from seed nuclides (isotopes near the iron peak of the cosmic abundance curve). The two codes interact through the neutron and proton reaction channels. We demonstrate the efficiency of our method with an example of the nucleosynthesis in a supernova’s helium shell triggered by the evaporation of neutrons and protons from α particles exposed to the neutrino flux from a collapsing stellar core. In this case, three or four iterations are enough to obtain an almost exact self-consistent solution.  相似文献   

Energy Spectra of Cosmic-Ray Protons and Nuclei Measured in the NUCLEON Experiment Using a New Method     

Atkin  E. V.  Bulatov  V.L.  Vasiliev  O. A.  Voronin  A. G.  Gorbunov  N. V.  Grebenyuk  V. M.  Dorokhov  V. A.  Karmanov  D. E.  Kovalev  I.M.  Kudryashov  I. A.  Kurganov  A.A.  Merkin  M. M.  Panov  A.D.  Podorozhny  D. M.  Polkov  D. A.  Porokhovoi  S. Yu.  Sveshnikova  L. G.  Tkachev  L.G.  Tkachenko  A. V.  Turundaevskiy  A. N.  Filippov  S. B.  Shumikhin  V. V. 《Astronomy Reports》2019,63(1):66-78

Astronomy Reports - Some results of studies of cosmic rays obtained during the NUCLEON space experiment in 2015–2017 are presented. This experiment was intended for direct measurements of the...  相似文献   

Nucleosynthesis during a Thermonuclear Supernova Explosion     

I.?V.?Panov  S.?I.?GlazyrinEmail author  F.?K.?R?pke  S.?I.?Blinnikov 《Astronomy Letters》2018,44(5):309-314

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Registration of weak ULF/ELF oscillations of the surface electric field strength     

A. I. Boldyrev  A. E. Vyazilov  V. N. Ivanov  R. V. Kemaev  V. Ya. Korovin  A. V. Melyashinskii  K. V. Pamukhin  V. N. Panov  Yu. N. Shvyrev 《Geomagnetism and Aeronomy》2016,56(4):503-512

Measurements of the atmospheric electric field strength made by an electrostatic fluxmeter with a unique threshold sensitivity for such devices (6 × 10^–2–10^–3 V m^–1 Hz^–1/2 in the 10^–3–25 Hz frequency range) and wide dynamic (120 dB) and spectral (0–25 Hz) ranges, are presented. The device parameters make it possible to observe the electric component of global electromagnetic Schumann resonances and long-period fluctuations in the atmospheric electric field strength.  相似文献