USE OF SPACE IMAGERY IN COMPILING ENVIRONMENTAL-PROTECTION MAPS (with reference to the Soligorsk potash-mining district)

The authors apply remote sensing data to the mapping of natural envionment with a focus on environmental protection. The technique is illustrated with particular reference to a largely swampy potash-mining deposit in Belorussia which is the largest potash producer of the USSR, accounting for 54% of its total output in 1983. Translated from: Kartografirovaniye po kosmicheskim snimkam i okhrana okruzhayushchey sredy (Mapping from Space Imagery and Protection of the Environment), edited by Ye. A. Vostokova et al., Moscow: Nedra, 1983, pp. 177-195.     

Spectroscopic and photometric studies of the magnetic cataclysmic variable EU UMa (=RE1149+28)

We present the optical observations of the AM Herculis system EU UMa (=RE1149+28) carried out in February 1993 with a TV scanner and a photometer (NEPh) at the secondary focus of the 6-m Special Astrophysical Observatory telescope. Spectroscopy with a time resolution of 300 s and a spectral resolution of 2 Å in the wavelength range ≈3950–4950 Å is used to analyze the variability of emission-line profiles, equivalent widths, central intensities R_c, and radial velocities with orbital phase. We determined the orbital period of the system from line radial-velocity measurements, 90.0±0.2 min. The emission-line profiles are highly variable. The Hβ and He II 4686 Å lines exhibit P Cyg profiles at selected phases. The spectral-line parameters were found to vary significantly on time scales from 5 to 15 min. The possible causes of the detected spectroscopic variability are discussed.     

Ladoga and Onega Hydrological Regimes and Their Variations

The characteristics of the Ladoga and Onega hydrological regimes were analyzed, and the features of the annual and long-term variations in their water balance components were determined. The statistically significant positive trends of the average annual precipitation and evaporation in the Ladoga water area and the water inflow for the period of 1932–1995 were determined. The relative effect of the Ladoga water balance components on the formation of its level was studied. Spectral analysis of the components of this balance revealed, in particular, characteristic periods of about four years in the last decades. Based on the analysis, including wavelet, of the longer series of long-term variations in the Ladoga water level, it was found that the spectral structure pronouncedly changed in the period from 1859 to 1995.     

Long-Term Dynamics of NDVI-Vegetation for Different Classes of Tundra Depending on the Temperature and Precipitation

Doklady Earth Sciences - The tundra was divided into different classes depending on the temperature and precipitation in accordance with the Holdridge classification. Dry, moist, wet, and rainy...