Evaluating Uncertainties in Coronal Electron Temperature and Radial Speed Measurements Using a Simulation of the Bastille Day Eruption     

Nelson Reginald  Orville St. Cyr  Joseph Davila  Lutz Rastaetter  Tibor Török 《Solar physics》2018,293(5):82

Obtaining reliable measurements of plasma parameters in the Sun’s corona remains an important challenge for solar physics. We previously presented a method for producing maps of electron temperature and speed of the solar corona using K-corona brightness measurements made through four color filters in visible light, which were tested for their accuracies using models of a structured, yet steady corona. In this article we test the same technique using a coronal model of the Bastille Day (14 July 2000) coronal mass ejection, which also contains quiet areas and streamers. We use the coronal electron density, temperature, and flow speed contained in the model to determine two K-coronal brightness ratios at (410.3, 390.0 nm) and (423.3, 398.7 nm) along more than 4000 lines of sight. Now assuming that for real observations, the only information we have for each line of sight are these two K-coronal brightness ratios, we use a spherically symmetric model of the corona that contains no structures to interpret these two ratios for electron temperature and speed. We then compare the interpreted (or measured) values for each line of sight with the true values from the model at the plane of the sky for that same line of sight to determine the magnitude of the errors. We show that the measured values closely match the true values in quiet areas. However, in locations of coronal structures, the measured values are predictably underestimated or overestimated compared to the true values, but can nevertheless be used to determine the positions of the structures with respect to the plane of the sky, in front or behind. Based on our results, we propose that future white-light coronagraphs be equipped to image the corona using four color filters in order to routinely create coronal maps of electron density, temperature, and flow speed.  相似文献   

Photoelectric device for to measure effects in gravitational computations     

Tibor Dombai 《Pure and Applied Geophysics》1948,13(1-2):25-27

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Estimation of the dispersion of an accidental release of radionuclides and toxic materials based on weather type classification     

Róbert Mészáros  ádám Leel?ssy  Csilla Vincze  Mihály Sz?cs  Tibor Kovács  István Lagzi 《Theoretical and Applied Climatology》2012,107(3-4):375-387

We investigate the influence of the regional-scale weather types on the atmospheric dispersion processes of the air pollutants originated from point sources. Hypothetical accidents were simulated with two different dispersion models. During a year’s test period, the 6-h emission of a radionuclide from the Paks Nuclear Power Plant (Paks NPP, Hungary) was assumed every day and the transport and deposition of the radionuclide was simulated by the Eulerian TREX dispersion model over the Central European region. In addition, the ALOHA Gaussian air dispersion model was also used for the local environment of the Paks NPP to simulate hypothetical hourly releases of ammonia during a 10-year period. During both types of model simulations, the dispersion of the plume for each time was analysed and tested with consideration of 13 circulation types corresponding to daily weather patterns over the Carpathian Basin. There are significant correlations between circulation types and plume directions and structures both in local and regional scales. The daily circulation pattern can be easily obtained from weather analyses; the expected size and direction of polluted area after an accidental release can be quickly estimated even before an accident occurs. However, this fast method cannot replace or neglect dispersion model simulations. It gives a ‘first guess’ and a fast estimation on the direction of the plume and can provide sufficient information for decision-making strategies.  相似文献   

Über gewisse integralmittelwerte der magnetischen induktion im erdinnern     

Tibor Kolbenheyer 《Studia Geophysica et Geodaetica》1959,3(4):369-375

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Mineral equilibria in mantle-derived rocks     

Leonid Perchuk  Tibor Gasparik   《Lithos》2002,60(3-4):vii

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Integration prospects of the Hungarian transport network into the more advanced European networks     

Tibor Tiner 《GeoJournal》1994,32(4):369-371

In spite of the advantageous transport-geographic situation of Hungary, the four decades of the so called planned socialist economy, neglecting the transportational infrastructure, made the country lag behind the rest of Europe. The two main points in the current development of the Hungarian transportation system are the establishment of proper links with the more developed western European transportational network, and starting a substantial technical development in all respects of domestic transportation in order to approach the standards of the more developed countries. The paper reviews the main characteristics of the project of the Hungarian development of transport by road and rail.  相似文献   

Das Schwerefeld eines Rotationssymmetrischen homogenen Ellipsoidsegmentes     

Tibor Kolbenheyer 《Studia Geophysica et Geodaetica》1967,11(4):413-418

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Transformation of enstatite — diopside — jadeite pyroxenes to garnet   总被引：1，自引：1，他引：1  

Tibor Gasparik 《Contributions to Mineralogy and Petrology》1989,102(4):389-405

The high-pressure stability of enstatite(En)-diopside(Di)-jadeite(Jd) pyroxenes has been investigated experimentally with a split-sphere anvil apparatus (USSA-2000). On the enstatite-pyrope join, the compositions of garnet coexisting with enstatite were determined at 100–165 kbar and 1450–1850° C. The results indicate complete solubility between enstatite and pyrope. In the system CaO-MgO-Al₂O₃-SiO₂ (CMAS), the compositions of coexisting pyroxenes and garnet were determined at 100–165 kbar and 1250–1750° C. At 157 kbar, 1650° C, garnet with the composition En₇₉Di₂₁ (mol%) forms on the En-Di join. In the system Na₂O-MgO-Al₂O₃-SiO₂ (NMAS), the compositions of coexisting pyroxenes and garnet were determined at 60–160 kbar and 1200–1850° C. On the En-Jd join, the first garnet has the composition En₄₈Jd₅₂ at 135 kbar, 1650° C, and En₅₃Jd₄₇ at 140 kbar, 1500° C. On the Di-Jd join, the first garnet with the composition Di₆₃Jd₃₇ forms around 170 kbar, 1650° C. In the En-Di-Jd system, the first appearance of garnet with the composition En₄₂Di₉Jd₄₉ is estimated at 133 kbar, 1650° C. The new pyroxene with the composition NaMg_0.5Si_2.5O₆ (NaPx) transforms to garnet at 154 kbar, 1650° C. The experimental results indicate that the transformation of a twopyroxene assemblage to garnet and residual pyroxene in the En-Di-Jd system could occur at pressures consistent with the 400 km seismic discontinuity and in a pressure interval of 0–3 kbar.  相似文献   

Experimental study of subsolidus phase relations and mixing properties of pyroxene and plagioclase in the system Na2O-CaO-Al2O3-SiO2     

Tibor Gasparik 《Contributions to Mineralogy and Petrology》1985,89(4):346-357

In the system Na₂O-CaO-Al₂O₃-SiO₂ (NCAS), the equilibrium compositions of pyroxene coexisting with grossular and corundum were experimentally determined at 40 different P-T conditions (1,100–1,400° C and 20.5–38 kbar). Mixing properties of the Ca-Tschermak — Jadeite pyroxene inferred from the data are (J, K): $$\begin{gathered} G_{Px}^{xs} = X_{{\text{CaTs}}} X_{{\text{Jd}}} [14,810 - 7.15T - 5,070(X_{{\text{CaTs}}} - X_{{\text{Jd}}} ) \hfill \\ {\text{ }} - 3,350(X_{{\text{CaTs}}} - X_{{\text{Jd}}} )^2 ] \hfill \\ \end{gathered} $$ The excess entropy is consistent with a complete disorder of cations in the M2 and the T site. Compositions of coexisting pyroxene and plagioclase were obtained in 11 experiments at 1,190–1,300° C/25 kbar. The data were used to infer an entropy difference between low and high anorthite at 1,200° C, corresponding to the enthalpy difference of 9.6 kJ/mol associated with the C \(\bar 1\) =I \(\bar 1\) transition in anorthite as given by Carpenter and McConnell (1984). The resulting entropy difference of 5.0 J/ mol · K places the transition at 1,647° C. Plagioclase is modeled as ideal solutions, C \(\bar 1\) and I \(\bar 1\) , with a non-first order transition between them approximated by an empirical expression (J, bar, K): $$\Delta G_T = \Delta G_{1,473} \left[ {1 - 3X_{Ab} \tfrac{{T^4 - 1,473^4 }}{{\left( {1,920 - 0.004P} \right)^4 - 1,473^4 }}} \right],$$ where $$\Delta G_{1,473} = 9,600 - 5.0T - 0.02P$$ The derived mixing properties of the pyroxene and plagioclase solutions, combined with the thermodynamic properties of other phases, were used to calculate phase relations in the NCAS system. Equilibria involving pyroxene+plagioclase +grossular+corundum and pyroxene+plagioclase +grossular+kyani te are suitable for thermobarometry. Albite is the most stable plagioclase.  相似文献   

Die Schwerewirkungen eines elliptischen Zylindersegmentes     

Tibor Kolbenheyer  Rezensent V. Vyskočil 《Studia Geophysica et Geodaetica》1971,15(3-4):282-287

Summary A method has been derived for computing the gravity effect of a segment of an infinite homogeneous elliptical cylinder. The initial data was represented by formulae expressing the components of the field of gravity of a homogeneous two-dimensional body by means of line integrals. The method is based on the integration of theln R function over the boundary of the cross-section of the attracting body, R being the distance from a fixed point in which the gravity effect is determined. The problem was solved in confocal co-ordinates.  相似文献