IAU MDC Photographic Meteor Orbits Database: Version 2013     

L. Neslušan  V. Porubčan  J. Svoreň 《Earth, Moon, and Planets》2014,111(3-4):105-114

A new 2013 version of the IAU MDC photographic meteor orbits database which is an upgrade of the current 2003 version (Lindblad et al. 2003, EMP 93:249–260) is presented. To the 2003 version additional 292 orbits are added, thus the new version of the database consists of 4,873 meteors with their geophysical and orbital parameters compiled in 41 catalogues. For storing the data, a new format enabling a more simple treatment with the parameters, including the errors of their determination is applied. The data can be downloaded from the IAU MDC web site: http://www.astro.sk/IAUMDC/Ph2013/  相似文献   

Quasimonochromatic whistler mode packets of slowly varying amplitude     

Ja.N. IstominV.I. Karpman 《Planetary and Space Science》1972

A nonlinear interaction between the whistler mode wave packet and resonant particles is considered. An evolution of the packet's shape is investigated in detail.  相似文献   

The motion of charged particles in a strong electromagnetic field and curvature radiation     

Yu. V. Chugunov  V. Ja. Eidman  E. V. Suvorov 《Astrophysics and Space Science》1975,32(1):L7-L10

The features of the relativistic charge particle motion and emission due to the radiative slamping in the strong electromagnetic fields are investigated. It is shown that the radiative force responsible for curvature radiation is associated with the particle drift in an inhomogeneous magnetic field. The adiabatic trajectory is obtained for the relativistic particle, moving in a strong static electron-magnetic field, particle energy being determined by the balance of the work of the electric field and the energy losses through curvature radiation.  相似文献   

Determination of radioactivity of rocks by measurement of gamma ray activity     

Věra Vaňková 《Studia Geophysica et Geodaetica》1957,1(1):193-195

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Space weathering and the color indexes of minor bodies in the outer Solar System     

Zuzana Kaňuchová  Rosario Brunetto  Mario Melita  Giovanni Strazzulla 《Icarus》2012,221(1):12-19

The surfaces of small bodies in the outer Solar System are rich in organic compounds and carbonaceous refractories mixed with ices and silicates. As made clear by dedicated laboratory experiments space weathering (e.g. energetic ion bombardment) can produce red colored materials starting from bright and spectrally flat ices. In a classical scenario, the space weathering processes “nurture” alter the small bodies surface spectra but are in competition with resurfacing agents that restore the original colors, and the result of these competing processes continuously modifying the surfaces is supposed to be responsible for the observed spectral variety of those small bodies. However an alternative point of view is that the different colors are due to “nature” i.e. to the different primordial composition of different objects. In this paper we present a model, based on laboratory results, that gives an original contribution to the “nature” vs. “nurture” debate by addressing the case of surfaces showing different fractions of rejuvenated vs. space weathered surface, and calculating the corresponding color variations. We will show how a combination of increasing dose coupled to different resurfacing can reproduce the whole range of observations of small outer Solar System bodies. Here we demonstrate, for the first time that objects having a fully weathered material turn back in the color–color diagrams. At the same time, object with the different ratio of pristine and weathered surface areas lay on specific lines in color–color diagrams, if exposed to the same amount of irradiation.  相似文献   

Photometric analysis of recently discovered eclipsing binary GSC 00008-00901     

Š. Parimucha  T. Pribulla  M. Vaňko  P. Dubovský  L. Hambálek 《Astrophysics and Space Science》2008,313(4):419-423

Photometric analysis of BVR _C light curves of newly discovered eclipsing binary GSC 0008-00901 is presented. The orbital period is improved to 0.28948(11) days. Photometric parameters are determined as well. The analysis yielded to conclusion that system is an over-contact binary of W UMa type with components not in thermal contact. The light curves from 2005 show the presence of a spot on the surface of one of the components, while light curves from 2006 are not affected by maculation.  相似文献   

First record of fossil anguines (Squamata; Anguidae) from the Oligocene and Miocene of Turkey     

Andrej Čerňanský  Davit Vasilyan  Georgios L. Georgalis  Peter Joniak  Serdar Mayda  Jozef Klembara 《Swiss Journal of Geoscience》2017,110(3):741-751

Fossil anguine lizard specimens from several Turkish localities are described in this paper. The material comes from ten different localities, spanning a large geographic area consisting of both parts of the European Turkey and Anatolia, and ranging in age from the Oligocene to the Late Miocene. In certain cases, the generic determination was possible and, accordingly, members of Ophisaurus and Anguis were identified and described in detail. The specimens of Anguis, found in different, Middle and Late Miocene localities from Anatolia, represent two of only a few fossil occurrences of this taxon. Moreover, the material reported herein represents the oldest occurrences of anguine lizards, not only from Turkey, but from southeastern Europe and the Eastern Mediterranean basin as a whole. These rare records provide important information about the dispersal routes of anguines from Europe to Asia and significantly enhance our understanding of their biogeography.  相似文献   

Longitudinal Distribution of Solar Magnetic Fields and Activity During the Ending and Starting Periods of Activity Cycles     

Bumba  V.  Garcia  A.  Klvaňa  M. 《Solar physics》2000,196(2):403-419

Studying the appearance of active regions during periods of solar activity minima, we observed that the magnetic fields of active regions belonging to the old and new cycle were mutually related. This was the reason we decided to investigate the relation of the old and new cycle activity during the two last minima in more detail. We examined the distribution of both activities in heliographic longitude, because the patterns of such distribution change substantially during the time of the minimum, and we studied their relation to the distribution and development of the global (background) magnetic field. We observed that the active regions of the old and new cycles tended to concentrate in the same active longitudes. The sources of their magnetic fluxes seem to have the same heliographic longitude. The beginning of the new cycle activity, occurring at the very beginning to a very weak degree in the equatorial zone, and then proceeding to higher latitudes, occurs in the magnetic field remnants of the old cycle activity. During the transition phase, a relatively large number of small active regions is produced by both cycles.  相似文献   

Gamma-ray absorption coefficients and chemical composition of tertiary volcanic rocks     

Věra Vaňková  Vladimír Kropáček  Reviewer J. Buben 《Studia Geophysica et Geodaetica》1976,20(1):52-63

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Earthquake epicentres in central and Eastern Europe     

Zdeňka Schenková  Vír Kárník  Vladimír Schenk  Reviewer J. Buben 《Studia Geophysica et Geodaetica》1979,23(2):197-199

Summary The investigated region covers the territories of Bulgaria, Czechoslovakia, the G.D.R., Hungary, Moldavia, Poland, Romania and the south-western Ukraine and parts of Austria, Greece, and Yugoslavia. Maps of epicentres demonstrate the geographical distribution of activity. Earthquakes occur in several seismogenic belts (provinces) related to neotectonic features of the region. A special phenomenon is the intermediate-depth focus of Vrancea releasing in the region the largest amounts of energy, together with a few crustal foci in Bulgaria.  相似文献