Groundwater Hydrochemistry of Suprapermafrost–Intrapermafrost Flow in Their Discharge Areas in Central Yakutia

Water Resources - The results of long-term studies of a group of aufeis-forming Buluus groundwater sources are given. A stow, which has been formed by the spring, contains the drainage area of the...     

An investigation of the Cassiopeia A radio-image in the decameter range

The observation results of the supernova remnant Cassiopeia A, obtained with the aid of two decameter radio interferometers at 20 and 25 MHz, are presented. The so obtained dependences of the visibility function modulus on the hour angle are compared with calculations based on the brightness distribution measurements of this source using the VLA at 1381 MHz. Discrepancies between the experimental data and the calculations considerably increase with the decrease in the frequency. It is suggested that interstellar medium absorption, causing a distortion in the source spectrum over the decameter range, may be responsible for changes in the Cas A brightness distribution at these frequencies as well.     

Mathematical modeling of a jet in the vicinity of a compact object

An MHD model for the formation of a jet in the vicinity of a compact object with a supersonic accretion regime is constructed, assuming that the plasma is perfectly electrically conducting. A stable, collimated jet of plasma along the z axis symmetric about the plane of the accretion disk is obtained. The parameters of the jet are in good agreement-with available observational data on the structure and properties of jets.     

Structural-hydrographic and morphometric analysis of river systems: Theoretical aspects

We examine the current possibilities for a further development and some basic notions of structural-hydrographic analysis of river systems. The advent of digital medium-scale global data on land surface and generally available software products strongly dictates a need to switch over from a functional to structural-functional modeling as the basic tool of land surface hydrology. On the other hand, the concepts from classic geo-morphology on the energy of topography, the structure of river basins and their linkage to modern tectonics, and on phenomena of double and antecedent valleys can be verified using a large body of statistical data to obtain a further development, based on introducing digital terrain models (DTM) and new algorithms for their processing.