The article describes a model of the two-way measurements of radial velocity based on the Doppler effect. The relations are presented for the instantaneous value of the increment range at the time of measurement and the radial velocity of the mid-dimensional interval. The compensation of methodological errors of interpretation of the two-way Doppler measurements is considered.
This paper contains a description of methods and software tools for creation of the information-analytical system for monitoring hazardous space objects. The paper presents the structure of the system and a description of its functional components thet enable rapid assessment of the NEO hazard and forecast of the effects of dengerous celestial bodies colliding with the Earth. The results of the system's operation regarding the modeling the motion of spact objects are also included in this work.
Near-Earth space is analyzed as a specific object for global monitoring. The structure and specific features of nearEarth space are considered. It is shown that this zone includes almost all the terrestrial fields and the regions where space is actively explored by man
The formation of space debris as an accumulation of small heavenly bodies in near-Earth space is considered. How debris can arise in nearEarth space is described. The accumulation of debris is shown to have a ring structure. The formation and spatial distribution of debris are statistically analyzed. A hypothesis for the formation of debris rings in near-Earth space is proposed.
During the last 15 years, the Current Sheets (CSs) have been intensively studied in the tail of the terrestrial magnetosphere, where protons are the dominated ion component. On the contrary, in the Martian magnetotail heavy ions (O+ and ) usually dominate while the abundance of protons can be negligible. Hence it is interesting to study the spatial structure and plasma characteristics of such “oxygen” CSs. MAVEN spacecraft (s/c) currently operating on the Martian orbit with a unique set of scientific instruments allows observation of the magnetic field and three-dimensional distribution functions of various ion components and electrons with a high time resolution. In this paper, we analyse nine intervals of the CSs observed by MAVEN in the near-Mars tail at the distances from the planet ~1.5–1RM, where RM is the radius of Mars. We analyse the spatial structure of the CSs and estimate their thickness for different magnetic configurations and relative abundance of the heavy and light ions in the sheets. It is shown that, similarly to the CSs in the Earth’s magnetotail, the thickness and complexity of the spatial structure of the Maritan CSs (i.e. the presence of embedded and / or peripheral current structures) depend on the magnetic configuration of the sheets, which, in turn, affects the fraction of the quasi-adiabatic particles in the CSs
It is believed that microscopic life may exist in the subglacial ocean of Europa, a moon of Jupiter. However, the radiation belts of Jupiter complicate the possibility of its exposure on the surface or at shallow depths. Using numerical simulations, we investigated the influence of the tilt of the Jupiter magnetic dipole, the Alwen wings, and the induced Europa field on the electron dynamics near the Jupiter satellite, which allowed us to refine the map of radiation doses on the Europa surface obtained earlier in the leading center approximation.
In this paper, the method of changing the trajectories of hazardous asteroids with orbits known for
some years to be on a possible collision course with the Earth is considered. The method relies on the use of
small asteroids (asteroidprojectiles) directed at hazardous celestial bodies by giving the projectile a suffi
ciently small velocity impulse ensuring the Earth gravity assist. As a result, the asteroidprojectile vector can
be controllably changed over a wide range. Apophis is considered as an example of the target asteroid. The
technical feasibility of this method is discussed. It is noted that despite the potential use of this elegant
method, its practical implementation requires further research and development.