Search Publications
Monte Carlo study of interaction between solar wind plasma and Venusian upper atmosphere
Barabash, S.; Stenberg, G.; Shematovich, V. I. +1 more
Isolated events of proton and alpha particle precipitation in the Venusian atmosphere were recorded with the use of the ASPERA-4 analyzer on board the ESA Venus Express spacecraft. Using a Monte Carlo simulation method for calculation of proton and alpha particle precipitations in the Venusian atmosphere, reflected and upward directed particle flu…
The estimate of the Venus magnetotail length
Popov, V. Yu.; Zelenyi, L. M.; Vasko, I. Yu.
We consider the process of flux tubes straightening in the Venus magnetotail on the basis of MHD model. We estimate the distance x t, where flux tubes are fully straightened due to the magnetic tension and the magnetotail with the characteristic geometry of field lines ("slingshot" geometry) ends. We investigate the influence of the tra…
Modeling of meteoroid streams: The velocity of ejection of meteoroids from comets (a review)
Ryabova, G. O.
An analytical review of the models of ejection of meteoroids from cometary nuclei is presented. Different formulas for the ejection velocity of meteoroids and the corresponding parameters are discussed and compared with the use of comet Halley and the Geminids meteoroid stream as examples. The ejection velocities obtained from observations of the …
Large-scale quasi-two-dimensional turbulence and a inverse spectral flux of energy in the atmosphere of Venus
Izakov, M. N.
The comparison of the theoretical inferences and the experimental data on large-scale turbulence in the atmospheres of the Earth and Venus, including those acquired with the Venus Express spacecraft, allows us to conclude that there is a inverse spectral flux of energy in the atmosphere of Venus, as in the terrestrial atmosphere, which participate…
The influence of the ionosphere in subsurface Martian soil sounding experiments and a method of its correction
Smirnov, V. M.; Yushkova, O. V.
The problem of radar sounding of the Martian soil from an orbiting spacecraft is analyzed. The influence of the ionosphere on the results of remote sounding is revealed through the results of numerical modeling and actual subsurface soil sounding experiments carried out using the MARSIS radar sounder aboard the Mars-Express spacecraft. A method of…
On the small-scale turbulence parameters in the atmosphere of venus and their use in the global circulation models
Izakov, M. N.
Vertical profiles of the turbulence parameters calculated for the planet-averaged conditions from the experimental data on the turbulent fluctuations of temperature and wind velocity are presented. Improved formulas accounting for the difference between the atmospheric gas on Venus and an ideal one, and the large difference in its thermal capacity…
Model of the magnetic field in the inner heliosphere with regard to radial field strength leveling in the solar corona
Veselovsky, I. S.; Lukashenko, A. T.
On the basis of experimental results from the Ulysses spacecraft, a model is proposed for calculating the magnetic field in the corona and the heliosphere in the potential approximation, which is a modification of the potential-field source-surface model. In addition to the photospheric surface and the source surface, a new demarcated spherical su…
Hierarchical approach to forecasting recurrent solar wind streams
Berghmans, D.; Seaton, D. B.; Veselovsky, I. S. +1 more
The hierarchical approach to predicting quasi-stationary, high-speed solar wind (SW) streams is described. This approach integrates various types of data into a single forecasting system by means of an ensemble of experts. The input data included the daily values of the coronal hole areas, which were calculated from the ultraviolet images of the S…
Project of the mission to Phobos
Zelenyi, L. M.; Zakharov, A. V.; Polischuk, G. M. +1 more
This article provides the main scientific objectives and characteristics of the Phobos-Soil project, intended to fly to the Martian satellite Phobos, deliver its soil samples to the Earth, as well as explore Phobos, Mars, and the Martian environment with onboard scientific instruments. We give the basic parameters of the ballistic scenario of the …
Spectral studies of asteroids 21 lutetia and 4 vesta as objects of space missions
Busarev, V. V.
Asteroid 21 Lutetia is one of the objects of the Rosetta mission carried out by the European Space Agency (ESA). The Rosetta spacecraft launched in 2004 is to approach Lutetia in July 2010, and then it will be directed to the comet Churyumov-Gerasimenko. Asteroid 4 Vesta is planned to be investigated in 2011 from the Dawn spacecraft launched by th…