Slowly Varying Component of Radio Emission from TVLM 513-46546 and Continuous Sources of High Energy Electrons in the Coronae of UltraCool Stars     

Zaitsev  V. V.  Stepanov  A. V. 《Geomagnetism and Aeronomy》2018,58(8):1144-1148

Geomagnetism and Aeronomy - It is shown that a source generating a slowly varying or quiet component of radio emission from ultracool stars such as the brown dwarf TVLM 513-46546 can be the...  相似文献   

Characteristics of the Energy Transfer by Alfvén Waves in the Solar Atmosphere     

Tsap  Yu. T.  Stepanov  A. V.  Kopylova  Yu. G.  Khaneichuk  O. V. 《Geomagnetism and Aeronomy》2020,60(4):446-451

Geomagnetism and Aeronomy - The propagation of linear Alfvén waves with periods of 10–200 s from the photosphere to the solar chromosphere under the conditions of an isothermal...  相似文献   

Stabilization versus decomposition in alpine ecosystems of the Northwestern Caucasus: The results of a tea bag burial experiment     

Tatiana G. Elumeeva  Vladimir G. Onipchenko  Asem A. Akhmetzhanova  Mikhail I. Makarov  Joost A. Keuskamp 《山地科学学报》2018,15(8):1633-1641

Mountainous areas exhibit highly variable decomposition rates as a result of strong local differences in climate and vegetation type. This paper describes the effect of these factors on two major determinants of the local carbon cycle: litter decomposition and carbon stabilization. In order to adequately reflect local heterogeneity, we have sampled 12 typical plant communities of the Russian Caucasus. In order to minimize confounding effects and encourage comparative studies, we have adapted the widely used tea bag index (TBI) that is typically used in areas with low decomposition. By incubating standardized tea litter for a year, we investigated whether (1) initial litter decomposition rate (k) is negatively correlated with litter stabilization (S) and (2) whether k or S exhibit correlations with altitude and other environmental conditions. Our results show that S and k are not correlated. Altitude, pH, and water content significantly influenced the stabilization factor S, while soil-freezing had no influence. In contrast, none of these factors predicted the decomposition rate k. Based on our data, we argue that collection of decomposition rates alone, as is now common practice, is not sufficient to understand carbon input to soils and can potentially lead to misleading results. Our data on community-specific decomposition and stabilization rates further constrain estimates of litter accumulation in subalpine communities and the potential effects of climate change.  相似文献   

Latitudinal and temporal shifts in the radial growth-climate response of Siberian larch in the Polar Urals     

Vladimir V. Kukarskih  Nadezhda M. Devi  Pavel A. Moiseev  Andrey A. Grigoriev  Maksim O. Bubnov 《山地科学学报》2018,15(4):722-729

This paper presents a dendroclimatic analysis of Siberian larch trees sampled along a latitudinal 260-km transect located in the Polar Urals,Russia. Three standardised chronologies were built over a length of 230–293 years using 79 individual tree-ring chronologies collected in the southern,middle and northern parts of the Polar Urals.Bootstrapped correlation functions showed that the annual growth of the larches was mainly influenced by the air temperatures in June and July. The relative role of the temperatures increased from south to north. Daily air temperature data analysis revealed that the duration of the growing season in the northern part of the Polar Urals is 24 days less than that in the southern part. At the present time, air temperatures exceeded threshold of 8~℃, 5 days earlier than it did in the beginning of the 20 th century In response to the increase in the duration of the growing season and the changing winter conditions in the Polar Urals over the last 130 years, radial growth–temperature relationships in larches have weakened;this effect was strongly pronounced in the southern part of the Polar Urals.  相似文献   

Acoustic and Slow Sausage Oscillations in the Stratified Solar Photosphere: Hinode Observations and Phase Relationships     

Y. T. Tsap  A. V. Stepanov  Y. G. Kopylova 《Solar physics》2016,291(11):3349-3356

  相似文献   

Rayleigh–Taylor Instability and Excitation of Super-Dreicer Electric Fields in the Solar Chromosphere     

V. V. Zaitsev  P. V. Kronshtadtov  A. V. Stepanov 《Solar physics》2016,291(11):3451-3459

  相似文献   

Mantle Transects in Africa According to Data of Mantle Xenocrysts and Diamond Inclusions     

Igor V. ASHCHEPKOV  Vladimir N. ZINCHENKO  Alexandr S. IVANOV 《《地质学报》英文版》2021,95(Z1):15-17

  相似文献   

Arsenocolusite in Pyrite Ores of the Saum Copper–Zinc Massive Sulfide Deposit,North Urals     

Ayupova  N. R.  Maslennikov  V. V.  Tseluyko  A. S.  Stepanov  A. V.  Artemyev  D. A.  Belogub  E. V.  Kotlyarov  V. A.  Butnyakov  A. V. 《Geology of Ore Deposits》2021,63(1):79-86

Geology of Ore Deposits - Pyrite ores on the flanks of the Saum copper–zinc massive sulfide deposit are clastic sediments intensely transformed under conditions of acid diagenesis. Colusite...  相似文献   

New induction sounding tested in Central Europe     

Vladimir Yu. Semenov  Borys Ladanivskyy  Krzysztof Nowożyński 《Acta Geophysica》2011,59(5):815-832

The hourly data of nine geomagnetic observatories situated in Central Europe have been analyzed using the generalized magnetovariation (GMV) method designed recently for induction soundings of inhomogeneous media. In this method, impedance is one of transfer functions in the differential relation between spectra of the magnetic components and their derivatives. The peculiarity of this impedance is its correspondence to the magnetotelluric one estimated from the linear relations. Three transfer functions have been estimated simultaneously for data of geomagnetic observatories, using three different routines working in the period range from three hours up to two days. Noises in the source field components have been compared with noise in the estimated plane field divergence. The multivariate errors-in-variables method was used to extract spatially and temporally coherent geomagnetic field structure from the partially incoherent geomagnetic variations. This method allows estimating reliably impedances and gradient tippers for each observatory, taking into consideration the Earth’s sphericity. The obtained responses have been used for induction soundings and for detecting a deep inhomogeneity in the region.  相似文献   

Introduction     

William L. Bandy  Yuri Taran  Carlos Mortera Guti��rrez  Vladimir Kostoglodov 《Pure and Applied Geophysics》2011,168(8-9):1251-1253

  相似文献