Variations of the magnetic field near Mars caused by magnetic crustal anomalies     

R.A. Frahm  E. Kallio  A. Fedorov 《Planetary and Space Science》2008,56(6):856-860

The possible avenues for photoelectron transport were determined during southern hemisphere winter at Mars by using a mapping analysis of the theoretical magnetic field. Magnetic field line tracing was performed by superposing two magnetic field models: (1) magnetic field derived from a three-dimensional (3D) self-consistent quasi-neutral hybrid model which does not contain the Martian crustal magnetic anomalies and (2) a 3D map of the magnetic field associated with the magnetic anomalies based on Mars Global Surveyor magnetic field measurements. It was found that magnetic field lines connected to the nightside of the planet are mainly channeled within the optical shadow of the magnetotail whereas magnetic field lines connected to the dayside of the planet are observed to form the remainder of the magnetosphere. The simulation suggests that the crustal anomalies create “a magnetic shield” by decreasing the region near Mars which is magnetically connected to the Martian magnetosphere. The rotation of Mars causes periodic changes in magnetic connectivity, but not to qualitative changes in the overall magnetic field draping around Mars.  相似文献   

Geochemistry and petrology of superpure quartzites from East Sayan Mountains,Russia     

Fedorov  A. M.  Makrygina  V. A.  Nepomnyaschikh  A. I.  Zhaboedov  A. P.  Parshin  A. V.  Posokhov  V. F.  Sokolnikova  Yu. V. 《中国地球化学学报》2019,38(1):22-39

Acta Geochimica - Quartzites are widespread within Earth’s lithosphere, but their highly pure varieties occur quite infrequently. With the development of alternative energy sources, including...  相似文献   

Mercury in the Water of Small Rivers of the Onega Bay Basin of the White Sea     

Fedorov  Yu. A.  Ovsepyan  A. E.  Savitsky  V. A.  Zimovets  A. A.  Dotsenko  I. V. 《Doklady Earth Sciences》2019,487(1):804-806

Doklady Earth Sciences - The results of expeditionary studies of the behavior of mercury in the water of small rivers in the basin of Onega Bay of the White Sea are presented. The priority forms of...  相似文献   

Role of the Radiation Factor in Global Climatic Events of the Late Holocene     

Fedorov  V. M.  Frolov  D. M.  Velasco Herrera  V. M. N.  Soon  W. W.-H.  Cionco  R. G. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(10):1239-1253

Izvestiya, Atmospheric and Oceanic Physics - On the basis of calculations of insolation and insolation characteristics, taking into account changes in solar activity, the causes of global climatic...  相似文献   

Phytocenoses of the Ob Estuary and Kara Sea Shelf in the Late Spring Season     

Sukhanova  I. N.  Flint  M. V.  Sakharova  E. G.  Fedorov  A. V.  Makkaveev  P. N.  Nedospasov  A. A. 《Oceanology》2018,58(6):802-816

Oceanology - Based on the material obtained in the spring–summer season of 2016, the composition and quantitative distribution of phytoplankton in the Ob estuary and over the Kara Sea shelf...  相似文献   

Steric Level Fluctuations and Deep Convection in the Labrador and Irminger Seas     

Belonenko  T. V.  Fedorov  A. M. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(9):1039-1049

Izvestiya, Atmospheric and Oceanic Physics - The paper considers steric level fluctuations in the northern Atlantic Ocean. We use a method that combines AVISO altimetry and GRACE gravity...  相似文献   

Field Simulation of Cadmium Pollution of a Freshwater Body     

D. N. Gar’kusha  Yu. A. Fedorov  T. V. Knyazeva  N. S. Tambieva 《Water Resources》2018,45(5):746-756

An experiment in mesocosms installed in a fish-rearing pond was used to adequately simulate the character of self-purification, migration, and the redistribution of cadmium and its chemical forms in major components of a freshwater ecosystem, into which this chemical is imported in concentrations far in excess of its MAC. The major portion of the imported cadmium was found to be removed from the water mass within a few days, mostly, as a component of particulate matter settling onto the bed, including dead plankton remains, as ion-exchange cadmium forms adsorbed by suspension (37%), and as forms associated with ferromanganese oxides (41%). The rate of cadmium removal from the water mass is determined both by the amount of particulate matter settling onto the bed and the efficiency of cadmium sorption by it, depending on the acid–alkaline and redox conditions in the water body.  相似文献   

Sulfide Sulfur in Water Objects with Different Mineralization     

Fedorov  Yu. A.  Mikhailenko  A. V.  Dotsenko  I. V. 《Water Resources》2019,46(2):S59-S64

Water Resources - Hydrogen sulfide, like other sulfides, is formed in aquatic environments due to sulphate reduction processes and putrefactive decomposition of organic matter of bottom sediments,...  相似文献   

Oil components in the mouth area of the Don R. and in the Sea of Azov: Results of many-year studies     

A. N. Kuznetsov  Yu. A. Fedorov 《Water Resources》2014,41(1):55-64

The data given are the results of many-year studying the distribution of the concentrations of main oil components (hydrocarbons, surfactants, and asphaltene-tarry substances) in the water mass, vertically settling particulate matter, and bottom sediment cores taken from the section Lower Don-The Gulf of Taganrog-Russian sector of the Sea of Azov in summer and autumn periods in 2006–2011. Spatial and seasonal regularities in the distributions of the total concentration of oil components and the values of their ratios in water, as well as the spatial and annual features of their accumulation in bottom sediments have been established. Radiological methods have been used for layer-by-layer dating of bottom sediment cores and determine the thickness of the layer that had formed under the maximal anthropogenic impact on ecosystems. The presence of considerable amounts of hydrocarbons of modern biological origin has been revealed in all components of examined aquatic complexes.  相似文献   

Currents in the Drake Passage by the observations in October–November of 2011     

M. N. Koshlyakov  S. V. Gladyshev  R. Yu. Tarakanov  D. A. Fedorov 《Oceanology》2013,53(1):1-12

The currents in the Drake Passage are studied from the ADCP and CTD data acquired in a section across the Drake Passage in October-November of 2011 and from the satellite altimeter data. A complicated pattern of currents including eight jets of the Antarctic Circumpolar Current (ACC) and a system of slope and abyssal currents was found. The most interesting result is the discovery of several cyclonic and anticyclonic mesoscale eddies confined to the abyss. Some reasons explaining the generation of such eddies by the meandering of the ACC jets in the upper ocean layer are presented.  相似文献