Model atmosphere of planet Venus according to the results of measurements on the Soviet automatic interplanetary station Venera-4

Model atmosphere of Venus based on measurements made by Venera-

Migration processes in the Solar System and their role in the evolution of the Earth and planets

We discuss problems of planetesimal migration in the emerging Solar System and exoplanetary systems. Protoplanetary disk evolution models and the formation of planets are considered. The formation of the Moon and of the asteroid and trans-Neptunian belts is studied. We show that Earth and Venus could acquire more than half of their mass in 5 million years, and their outer layers could accumulate the same material from different parts of the feeding zone of these planets. The migration of small bodies toward the terrestrial planets from various regions of the Solar System is simulated numerically. Based on these computations, we conclude that the mass of water delivered to the Earth by planetesimals, comets, and carbonaceous chondrite asteroids from beyond the ice line could be comparable to the mass of Earth's oceans. The processes of dust migration in the Solar System and sources of the zodiacal cloud are considered.Comment: 30 pages, 9 figure

Temperature, pressure and density of Venus' atmosphere according to measurement data of the AIS Venera-4

Atmospheric temperature, pressure, and density of Venus according to measurements obtained by AIS Venera-

An implementation of Monte Carlo weighting method on multiprocessor systems

In this paper we consider the use of parallel multiprocessor systems for the direct simulation Monte Carlo method. Application of this algorithm on the HATHI-2 parallel computer with different type of system configuration is described. We discuss problems of efficiency and speed-up ratio for our method and give examples of a computer simulation of some non-equlibrium kinetic problems. 1 Introduction Multiprocessor computing systems based on transputer elements have in recent years become an outlooking tool for modern computational methods of simulation rarefied gas problems. The reason lays in the fact that the mentioned computational problems have inner structural parallelism, and the use of parallel computers for them seems to be natural. The main obstacle on the way to a widespread use of massively parallel multiprocessor systems lays in the fact that in order to get efficient performance of such systems, it is necessary not only to convert sequential numerical algorithms into para..