Solar magnetic field distribution and geomagnetic activity     

Václav Bumba  Ladislav Hejna  Reviewer J. Halenka 《Studia Geophysica et Geodaetica》1986,30(2):158-171

Summary Regularities in the solar background magnetic field distribution are described and some of their specific patterns and their structures are studied. The influence of the solar differential rotation on the behaviour of Magnetic Active Longitudes is demonstrated. The origin of some specific details different in both polarities is discussed. The relation of this longitudinal solar magnetic field distribution to the longitudinal distribution of the daily geomagnetic character figures C9 is investigated. Some correlational characteristics are given. The specific Index of Geomagnetic Recurrence is estimated and the changes of its values in time are demonstrated.

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Some terrestrial effects of flares and surge type filaments     

Ladislav Křivský  Vojtěch Letfus 《Studia Geophysica et Geodaetica》1961,5(1):92-93

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Variability of the respiratory surface area of pupae in Simulium monticola species group (Diptera, Simuliidae)     

Matú&#x; Kúdela  Ladislav Jedli ka 《Limnologica》2002,32(3)

The variability of the respiratory surface area of Simulium monticola Friederichs, 1920 and Simulium argyreatum Meigen, 1838 pupae was studied in detail. 333 pupae from Western Carpathian Mts. were investigated. According to the tubercles on thorax and head of the pupa of S. monticola, two morphological forms were distinguished (S. monticola 1 and S. monticola 2). Both were studied separately. In any species or form respectively we measured the lengths of all respiratory filaments and basal trunks, the widths of the basal trunks, the widths of the filaments on their proximal and distal end and the widths 0.25 mm from the proximal end. In all species (forms) differences in the size of the respiratory surface area between the first (April – June) and the second generation (August – October) were found. In S. monticola 1 the mean real respiratory surface area was significantly (p < 0.001) larger in spring (3.67 mm²) than in summer (2.19 mm²). In S. monticola 2 the mean real respiratory surface area was 3.45 mm² in spring, and it was significantly larger in females than in males (p = 0.034). In S. argyreatum the mean real respiratory surface area was 2.80 mm² in spring 2001 while in different summer generations it was significantly smaller: 1.58 mm² in 1999, 1.84 mm² in 2000 and 2.12 mm² in 2001. All these groups differed significantly from each other. Regression models could explain 64.5% (power model) of the real respiratory surface area in S. monticola 1 and 19.9% (various models) of the real respiratory surface area in S. argyreatum due to the variability of the adult size.  相似文献   

Influence of atmospheric pressure variations on measurements made with Sharpe and Worden gravimeters     

Ladislav Gargalovič  Ludmila Kubáčková  Ivana Jakubcová  Reviewer Z. Šimon 《Studia Geophysica et Geodaetica》1978,22(1):93-98

Summary The paper deals with the influence of the atmospheric pressure variations on Sharpe gravimeters CG 2 No. 226 and 280 and on the Worden gravimeter No. 978, equipped with a thermostat.Dedicated to RNDr. Jan Pícha, CSc., on his 60th Birthday  相似文献   

Important flare events in variations of the auroral electrojet index     

Ladislav Křivský  Reviewer J. Halenka 《Studia Geophysica et Geodaetica》1977,21(3-4):410-414

Summary The effects of solar proton flares and enhanced solar activity, indicated by intensive radio bursts in the decimetre range, on the Auroral Electrojet (AE) Index at the time these events occurred, are investigated. A significant increase in the level of the AE index was observed after the occurrence of these events.  相似文献   

Cloud coverage aspects of the albedo effect     

David Vokrouhlický  Ladislav Sehnal 《Celestial Mechanics and Dynamical Astronomy》1993,57(3):493-508

We discuss some details of the cloud coverage aspects of the albedo effect — the pressure of the radiation reflected by the Earth — on the motion of an artificial satellite. We focus on modeling of the Earth's surface reflection and propagation of the radiation through the atmosphere. We adopt analytical models of these phenomena from radiative transfer theory, in contrast to earlier approaches, based on the fitting of satellite photometry data. We perform several computations based on the accepted models for the ERS-1 and MACEK satellites to test the hierarchy of importance of the effects investigated. In the case of the MACEK mission (which carried a precision accelerometer on board) this information might be essential when interpreting the data.  相似文献   

Motion of a Meteoroid Released from an Asteroid     

Peter Vereš  Jozef Klačka  Ladislav Kómar  Juraj Tóth 《Earth, Moon, and Planets》2008,102(1-4):47-51

Evidence of asteroid surface features as regolith grains and larger boulders implies resurfacing possibility due to external forces such as gravitational tidal force during close planet encounters. Motion of a meteoroid released from an asteroid in the gravitational fields of the asteroid and the Earth is modeled. We are interested mainly in a distance between the meteoroid and the asteroid as a function of the time. Applications to Itokawa and some close approaching NEAs are presented.  相似文献   

Schroeter's ratios for Martian craters: Radar results     

Ladislav E. Roth 《Earth, Moon, and Planets》1991,52(1):27-49

Schroeter's ratios (ratios of the rim volume to the apparent volume) are determined for a sample of 29 large, degraded Martian craters selected from the Goldstone Mars radar altimetry data. On the average, the values of the calculated Schroeter's ratios are about two orders of magnitude smaller than the same ratios for fresh lunar craters. This indicates a severe rim volume deficit in degraded Martian craters and it provides an additional support to the notion of a widespread resurfacing of intercrater plains on Mars. Schroeter's ratios for degraded craters could provide a semi-quantitative measure of the effects of the modification processes that had been active on Mars and on the other planetary bodies.  相似文献   

Geochemistry of the Drahotín and Mutěnín intrusions, West Bohemian shear zone, Bohemian massif: contrasting evolution of mantle-derived melts     

Lukáš Ackerman  Martina Krňanská  Wolfgang Siebel  Ladislav Strnad 《Mineralogy and Petrology》2010,99(3-4):185-199

In western Bohemia, the Drahotín (gabbro-diorite) and Mutěnín (gabbronorite-diorite-syenite) intrusions show different origins and patterns of geochemical evolution. Parental magmas of the Drahotín intrusion were derived predominantly from enriched mantle sources, and the melts have undergone a significant degree of assimilation-fractional crystallization (AFC) during their ascent and/or emplacement into the crust. In contrast, the compositional variation of the complex Mutěnín intrusion cannot be explained by simple AFC processes, but more likely reflects the involvement of several parental magmas. The gabbronorite was derived from a depleted mantle source, whereas the diorite/syenite stem from a mixed mantle-crust reservoir. The contrasting evolution of the Drahotín and Mutěnín intrusions may be due to their melt derivation and magma emplacement under different tectonothermal regimes at different times.  相似文献   

Site formation processes in loess areas: A case study from moravany-žakovska,western slovakia     

Ladislav Bnesz  Josef Hromada  Janusz Kozlowski  Krzysztof Sobczyk  Maciej Pawlikowski 《Geoarchaeology》1995,10(4):237-255

The site of Moravany-Žakovska in western Slovakia is situated in a loessic terrain and is dated to the end of the Late Glacial Maximum. This article shows the importance of analyzing the 0.01-0.1 mm fraction to interpret the sedimentological environment and a number of measured anthropogenic indices, such as burnt quartz grains, charcoal, radiolarite chips, microflakes, and microfragments of bone. Analysis of the profile of the site through time reveals the relationship between occupational levels and phases of slope wash that occurred during wetter climatic episodes; these are separated by phases of aeolian sedimentation. At the same time, analysis of anthropogenic indices in this size fraction permitted the identification of occupational levels, including those not recorded by macrofinds. Analysis of anthropogenic indices in horizontal exposures enabled the identification of latent settlement structures such as hearths, areas of radiolarite processing, zones where mineral dyes were prepared, and other structures not recorded by macrofinds.  相似文献