Stokes-meter observations of the solar mean magnetic field: Probable manifestations of strong small-scale magnetic fields     

M. L. Demidov  V. M. Grigor’ev  V. S. Peshcherov 《Astronomy Reports》2005,49(7):559-566

For many years, information on the solar mean magnetic field (SMMF) of the Sun—an important heliophysical and astrophysical parameter—was restricted to magnetographic measurements in only one spectral line, FeI λ525.02 nm. More informative observations of the Stokes-meter parameters of the SMMF were first initiated on a regular basis at the Sayan Solar Observatory. The availability of I and V data obtained simultaneously in several spectral lines has made it possible to study fundamentally new physical problems. In this paper, based on a comparison of SMMF observations in several spectral lines, we find high correlations in the data and important systematic differences in the magnetic-field strength B, which we interpret as a manifestation of kilogauss magnetic fields in fine-structure magnetic elements. Results of theoretical modeling of the SMMF strength ratios for the FeI λ525.02 nm-FeI λ524.70 nm and FeI λ630.15 nm-FeI λ630.25 nm lines are presented. The asymmetries of the V profiles of four lines near the FeI λ525.02 nm line are examined; these lines are important diagnostics for studies of small-scale dynamical processes. The Sayan Solar Observatory SMMF measurements are in good consistency with the Wilcox Solar Observatory data for 2003: for a comparison of N = 137 pairs of points in the two data sets, the correlation coefficient ρ is 0.92 for the linear regression between the datasets B_WSO = 0.03(±0.05) + 0.93(±0.03)B_SSO.  相似文献   

On the warming of intermediate and deep waters in the equatorial North Atlantic     

A. A. Sarafanov  A. N. Demidov  A. V. Sokov 《Russian Meteorology and Hydrology》2008,33(3):175-179

In July 2000, a transatlantic hydrographic section was made on board the Russian R/V Akademik Ioffe in the northern equatorial region at ～6.5° N on the WOCE (World Ocean Circulation Experiment) A06 line. A significant warming in the layers of intermediate and deep waters in the interior eastern basin is determined from comparison of the section temperature data and those obtained on the WOCE A06 line in 1993. This result, together with the results of the previous studies, indicates a substantial warming of intermediate and upper deep waters above 2800–3000 m in the eastern equatorial North Atlantic during the second half of the 20th century. In the 1000–2000 m layer, temperature has increased by 0.13–0.14°C since 1957.  相似文献   

Archaeal Communities of Frozen Quaternary Sediments of Marine Origin on the Coast of Western Spitsbergen     

Karaevskaya  E. S.  Demidov  N. E.  Kazantsev  V. S.  Elizarov  I. M.  Kaloshin  A. G.  Petrov  A. L.  Karlov  D. S.  Schirrmeister  L.  Belov  A. A.  Wetterich  S. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(10):1254-1270

Izvestiya, Atmospheric and Oceanic Physics - The archaeal composition of permafrost samples taken during the drilling of frozen marine sediments in the area of the Barentsburg coal mine on the east...  相似文献   

Vertical Variability of Primary Production and Chlorophyll a in the Kara Sea in the Middle of Summer: Contribution of Subsurface Maxima to the Water Column Values     

Demidov  A. B.  Gagarin  V. I.  Eremeeva  E. V.  Artemiev  V. A.  Polukhin  A. A.  Shchuka  S. A.  Grigoriev  A. V.  Khrapko  A. N.  Flint  M. V. 《Oceanology》2021,61(5):645-661

Oceanology - Spatial and vertical variability of primary production (PP) and Chl a were studied in the framework of the 76th cruise of R/V Akademik Mstislav Keldysh to the Kara Sea from July 7 to...  相似文献   

Interannual Variability of the Ice Cover and Primary Production of the Kara Sea     

A. B. Demidov  S. V. Sheberstov  V. I. Gagarin 《Oceanology》2018,58(4):537-549

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Study of some characteristics of large-scale solar magnetic fields during the global field polarity reversal according to observations at the telescope-magnetograph Kislovodsk Observatory     

A. G. Tlatov  D. V. Dormidontov  R. V. Kirpichev  M. P. Pashchenko  A. D. Shramko  V. S. Peshcherov  V. M. Grigoryev  M. L. Demidov  P. M. Svidskii 《Geomagnetism and Aeronomy》2015,55(7):969-975

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Concerning five-minute variations of the global magnetic field of the Sun     

V. M. Grigoryev  M. L. Demidov 《Solar physics》1991,133(1):103-110

For the purpose of identifying five-min oscillations we analyze long-term continuous observations of the solar magnetic field (with a duration from 3 to 11 hours) with 0.5 D spatial resolution obtained with the STOP telescope (Solar Telescope for Operative Predictions) at the Sayan observatory in 1987 and 1989. It is shown that global magnetic field fluctuations with such periods seem to be real, but the character of corresponding power spectra is strongly dependent on the mean field strength in the magnetograph aperture.  相似文献   

Seasonal variability of the surface chlorophyll “a” in the Drake Passage     

A. B. Demidov  V. I. Gagarin  A. V. Grigoriev 《Oceanology》2010,50(3):327-341

The seasonal variability of the surface chlorophyll “a” (Chl-s) was studied for five different hydrological areas in the Drake Passage. The data were collected both in the field (December 2001–March 2002, and November 2007) and by satellite observations. One maximum of Chl-s was registered for the area northward of the Antarctic Polar Front in November 2007. This maximum moves southwards to the Antarctic and Continental Antarctic regions in December and January, respectively. The major factors affecting the phytoplankton growth were analyzed, namely, the decrease of the mixed water layer’s depth due to jogging during the austral late spring and summer and seasonal water temperature increase. The comparison of the field and satellite data allows us to conclude that the standard OC4v4 algorithm usually underreports the Chl-s concentration when it exceed 0.2 mg m⁻³.  相似文献   

Current measurements in underwater channels of the Atlantic Ocean during cruise 27 of R/V <Emphasis Type="Italic">Akademik Ioffe</Emphasis> (April 5–May 18, 2009)     

E. G. Morozov  A. N. Demidov  T. A. Demidova  V. Yu. Lyapidevskii  R. Yu. Tarakanov 《Oceanology》2010,50(2):291-293

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Structure and variability of deep waters in the Romanche Fracture Zone     

A. N. Demidov  E. G. Morozov  V. G. Neiman 《Doklady Earth Sciences》2006,410(7):1136-1140

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