An Anisotropic Cosmic-Ray Enhancement Event on 07-June-2015: A Possible Origin     

Agnieszka Gil  Gennady A. Kovaltsov  Vladimir V. Mikhailov  Alexander Mishev  Stepan Poluianov  Ilya G. Usoskin 《Solar physics》2018,293(11):154

A usual event, called anisotropic cosmic-ray enhancement (ACRE), was observed as a small increase (\({\leq}\,5\%\)) in the count rates of polar neutron monitors during 12?–?19 UT on 07 June 2015. The enhancement was highly anisotropic, as detected only by neutron monitors with asymptotic directions in the southwest quadrant in geocentric solar ecliptic (GSE) coordinates. The estimated rigidity of the corresponding particles is \({\leq}\,1\) GV. No associated detectable increase was found in the space-borne data from the Geostationary Operational Environmental Satellite (GOES), the Energetic and Relativistic Nuclei and Electron (ERNE) on board the Solar and Heliospheric Observatory (SOHO), or the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) instruments, whose sensitivity was not sufficient to detect the event. No solar energetic particles were present during that time interval. The heliospheric conditions were slightly disturbed, so that the interplanetary magnetic field strength gradually increased during the event, followed by an increase of the solar wind speed after the event. It is proposed that the event was related to a crossing of the boundary layer between two regions with different heliospheric parameters, with a strong gradient of low-rigidity (\({<}\,1\) GV) particles. It was apparently similar to another cosmic-ray enhancement (e.g., on 22 June 2015) that is thought to have been caused by the local anisotropy of Forbush decreases, with the difference that in our case, the interplanetary disturbance was not observed at Earth, but passed by southward for this event.  相似文献   

Carbon Isotope Characteristics as Evidence of an External Source of High-Temperature Granitoids in Granulite Complexes     

Safonov  O. G.  Reutsky  V. N.  Shcherbakov  V. D.  Golunova  M. A.  Varlamov  D. A.  Yapaskurt  V. O.  van Reenen  D. D. 《Doklady Earth Sciences》2018,483(2):1515-1518

Doklady Earth Sciences - Data on the carbon isotope composition of graphite and CO2 from inclusions in quartz of granitoids of the Southern Marginal Zone (SMZ) of the Limpopo granulite belt, South...  相似文献   

Phosphates of the Chalotskoe Pegmatite Deposit,Transbaikal Region     

Lykova  I. S.  Varlamov  D. A.  Chukanov  N. V.  Pautov  L. A.  Ksenofontov  D. A. 《Geology of Ore Deposits》2018,60(7):636-642

A number of rare phosphates have been found in specimens from the Chalotskoe pegmatite deposit, Transbaikal region, Russia: väyrynenite, MnBe[PO₄](OH,F); parascholzite, CaZn₂[PO₄]₂ · 2H₂O; messelite, Ca₂(Fe²⁺,Mn)[PO₄]₂ · 2H₂O; eosphorite, MnAl[PO₄](OH)₂ · H₂O; moraesite, Be₂[PO₄](OH)4H₂O; and fluorapatite. Väyrynenite forms pink grains 2–3 mm in size, less frequent prismatic crystals up to 0.8 × 3.0 cm, and spheres up to 3 mm in diameter. Parascholzite occurs as pockets up to 0.6 × 1.0 cm composed from snow-white small grains. Messelite forms pale yellow honeycomb grains and poorly shaped crystals up to 1 mm. Eosphorite has been seen in the Chalotskoe pegmatites before, but it has not been studied in detail. It occurs as red-brown prismatic crystals up to 8 cm in length, occasionally forming openbook- like aggregates and pink to pale pink grains up to 5 mm in size. Moraesite forms snow-white fibrous aggregates up to 5 × 6 mm, together with white spheres and short prismatic crystals of fluorapatite up to 1 mm. Microcline, albite, quartz, muscovite, beryl, schorl, almandine-spessartine, columbite-(Fe), and bertrandite are associated minerals. Väyrynenite and parascholzite are found for the first time in Russia.

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Beitrag zur quantitativen Analyse von Mineralphasen mittels Röntgendiffraktion     

E. Schroll  E. Stepan 《Mineralogy and Petrology》1968,12(4):392-402

Zusammenfassung Bei der Durchführung quantitativer Gemenge-Analysen mit Hilfe der Röntgendiffraktionsmethode kann man den Massenschwächungskoeffizienten (^*) verwenden, den man bei der Röntgenfluoreszenzanalyse Röhrenhauptlinienverfahren vonSchroll-Stepon erhalten hat. Er wird von der Wellenlänge der Röntgenfluoreszenzstreustrahlung auf die Wellenlänge der Diffraktionsröhre transformiert. Ein Intensitäts-Konzentrationsdiagramm, in dem die Intensität der gewählten Diffraktionslinie durch das Produkt von Intensität und dem jeweiligen Wert von ^* ersetzt wird, ergibt eine allgemeingültige Eichgerade. Als Beispiel werden Messungen an Zweistoffsystemen wie Magnesit-Quarz, Albit-Quarz, Calcit-Quarz, Stilpnomelan-Quarz und Siderit-Quarz angeführt.Die vorgeschlagene Methode ist für kombinierte Diffraktions- und Röntgenfluoreszenzanalysen sehr zweckmäßig.

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Summary Applicating the quantitative X-ray-diffraction-analysis für mixtures of minerals the use of the mass absorption coefficient (^*) is possible, which is received by the X-ray-fluorescence-analysis of the same sample following the method proposed by the authors. The mass absorption coefficients must be transformed to the new wave length of the X-ray-diffraction tube. In the intensity-concentration-diagram the intensity is substituted by the product of intensity and mass absorption coefficient. An uniform standard line is received, as the measurement of quartz shows in the systems of two-substances, such as magnesite-quartz, albite-quartz, calcite-quartz, stilpnomelan-quartz and siderite-quartz.The proposed method is very useful for the combined X-ray-diffraction and X-ray fluorescence analysis.

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New data on the gold-antigorite association of the Urals     

V. V. Murzin  D. A. Varlamov  S. N. Shanina 《Doklady Earth Sciences》2007,417(2):1436-1439

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Functioning of the ecosystem in the Sea of Azov during winter     

G. G. Matishov  O. V. Stepan’yan  V. V. Povazhnyi  G. V. Kovaleva  K. V. Kreneva 《Doklady Earth Sciences》2007,413(1):297-299

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Experimental Study of the Formation of Chromium-Bearing Priderite and Yimengite as Products of Modal Mantle Metasomatism     

Butvina  V. G.  Vorobey  S. S.  Safonov  O. G.  Varlamov  D. A.  Bondarenko  G. V.  Shapovalov  Yu. B. 《Doklady Earth Sciences》2019,486(2):711-715

Doklady Earth Sciences - The results of experiments on the synthesis of exotic titanates (priderite and yimengite) simulating metasomatic conditions of alteration of the mantle minerals (chromite...  相似文献   

Zinc-rich and copper-bearing amphiboles from sulfide-free ore occurrences of the Pelagonian Massif,Republic of North Macedonia     

Chukanov  Nikita V.  Zubkova  Natalia V.  Jančev  Simeon  Pekov  Igor V.  Ermolaeva  Vera N.  Varlamov  Dmitry A.  Belakovskiy  Dmitriy I.  Britvin  Sergey N. 《Mineralogy and Petrology》2020,114(2):129-140

Mineralogy and Petrology - This paper describes specific features of isomorphism of unusual amphiboles containing up to 23&nbsp;wt% ZnO and up to 1.3&nbsp;wt% CuO from sulfide-free...  相似文献   

Isotope Characteristics of Carbonates from Rocks of Greenstone Belts as an Indicator of a Possible Source of Fluids in Precambrian Granulite Complexes: An Example from the Giyani Greenstone Belt and the Limpopo Granulite Complex,South Africa     

Mityaev  A. S.  Safonov  O. G.  Reutsky  V. N.  Izokh  O. P.  Varlamov  D. A.  Kozlovskii  V. M.  van Reenen  D. D.  Aranovich  L. Y. 《Doklady Earth Sciences》2020,492(1):342-345

Doklady Earth Sciences - Data on the carbon and oxygen isotopic composition of carbonates from the rocks of the Giyani greenstone belt, Kaapvaal craton, South Africa are presented. This belt is...  相似文献   

Open and coastal seas interactions south of Japan represented by an ensemble Kalman filter     

Yasumasa Miyazawa  Toru Miyama  Sergey M. Varlamov  Xinyu Guo  Takuji Waseda 《Ocean Dynamics》2012,62(4):645-659

We investigated the feasibility of the ensemble Kalman filter (EnKF) to reproduce oceanic conditions south of Japan. We have adopted the local ensemble transformation Kalman filter algorithm based on 20 members’ ensemble simulations of the parallelized Princeton Ocean Model (the Stony Brook Parallel Ocean Model) with horizontal resolution of 1/36°. By assimilating satellite sea surface height anomaly, satellite sea surface temperature, and in situ temperature and salinity profiles, we reproduced the Kuroshio variation south of Japan for the period from 8 to 28 February 2010. EnKF successfully reproduced the Kuroshio path positions and the water mass property of the Kuroshio waters as observed. It also detected the variation of the steep thermohaline front in the Kii Channel due to the intrusion of the Kuroshio water based on the observation, suggesting efficiency of EnKF for detection of open and coastal seas interactions with highly complicated spatiotemporal variability.  相似文献