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  • Articles  (63)
  • Geosciences  (63)
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  • Articles  (63)
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  • 1
    Electronic Resource
    Electronic Resource
    The Atmospheres of the Outer Planets (1983)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 11 (1983), S. 415-457 
    Details
    ISSN: 0084-6597
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ea.11.050183.002215
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of tetrakis(thiourea)copper(I) hexafluorosilicate (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 1235-1236 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740879006026
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of solar activity on the earth's atmosphere and biosphere - M.N. Gnevyshev and A.I. Ol (Editors). John Wiley & Sons, Ltd., Chichester, UK £ 21.45
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 18 (1979), S. 248 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(79)90120-1
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  • 4
    Electronic Resource
    Electronic Resource
    Progress in planetary exploration - R.W. Shorthill, M.Ya. Marov and J.A.M. McDonnell: Pergamon Press. Oxford. U.K. £17.50. U.S. 40.00
    Amsterdam : Elsevier
    Planetary and Space Science 30 (1982), S. 109 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(82)90080-0
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  • 5
    Electronic Resource
    Electronic Resource
    Evolution of localized folding for a thin elastic layer in a softening visco-elastic medium (1996)
    Springer
    Pure and applied geophysics 146 (1996), S. 229-252 
    Details
    ISSN: 1420-9136
    Keywords: Localized folding ; softening visco-elastic medium ; instability of layer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Long compressed elastic struts on softening elastic foundations have a tendency to buckle locally. The same tendency is demonstrated here for the instantaneous response of elastic struts supported by visco-elastic media. A governing nonlinear partial differential equation is derived to describe the evolution of the localized form in time. Under the assumed constant end-shortening this is found to be approximated by a coupled set of seven ordinary differential (diffusion) equations. As the load drops to zero, the localized buckle pattern evolves towards the form of the single long wave, but remains aperiodic for all time. Three-dimensional plots show how this localized pattern changes over time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876491
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  • 6
    Electronic Resource
    Electronic Resource
    Localized folding of viscoelastic layers (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 58-64 
    Details
    ISSN: 1437-3262
    Keywords: Aperiodicity ; Buckling ; Evolution ; Modelling ; Spatial chaos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Naturally occurring fold systems are typically irregular. Although such systems may sometimes be approximated by a periodic geometry, in reality they are commonly aperiodic. Ord (1994) has proposed that naturally occurring fold systems may display spatial chaos in their geometry. Previous work has indicated that linear theories for the formation of fold systems, such as those developed by Biot (1965), result in strictly periodic geometries. In this paper the development of spatially chaotic geometries is explored for a thin compressed elastic layer embedded in a viscoelastic medium which shows elastic softening. In particular, it is shown that spatially localized forms of buckling can develop and the evolution of these systems in the time domain is presented. A nonlinear partial differential equation, fourth order in a spatial variable and first order in time, is found to govern the evolution. A related nonlinear fourth-order ordinary differential equation governs an initial elastic phase of folding. The latter equation belongs to a class with spatially chaotic solutions. The paper reviews the implications of localization in the geological framework, and draws some tentative conclusions about the development of spatial chaos. Crudely arrived-at, yet plausible, evolutionary time plots under the constraint of constant applied end displacement are presented. Emphasis throughout is on phenomenology, rather than underlying mathematics or numerics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192061
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  • 7
    Electronic Resource
    Electronic Resource
    Localized folding of viscoelastic layers (1996)
    Springer
    Geologische Rundschau 85 (1996), S. 58-64 
    Details
    ISSN: 0016-7835
    Keywords: Key words Aperiodicity ; Buckling ; Evolution ; Modelling ; Spatial chaos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Naturally occurring fold systems are typically irregular. Although such systems may sometimes be approximated by a periodic geometry, in reality they are commonly aperiodic. Ord (1994) has proposed that naturally occurring fold systems may display spatial chaos in their geometry. Previous work has indicated that linear theories for the formation of fold systems, such as those developed by Biot (1965), result in strictly periodic geometries. In this paper the development of spatially chaotic geometries is explored for a thin compressed elastic layer embedded in a viscoelastic medium which shows elastic softening. In particular, it is shown that spatially localized forms of buckling can develop and the evolution of these systems in the time domain is presented. A nonlinear partial differential equation, fourth order in a spatial variable and first order in time, is found to govern the evolution. A related nonlinear fourth-order ordinary differential equation governs an initial elastic phase of folding. The latter equation belongs to a class with spatially chaotic solutions. The paper reviews the implications of localization in the geological framework, and draws some tentative conclusions about the development of spatial chaos. Crudely arrived-at, yet plausible, evolutionary time plots under the constraint of constant applied end displacement are presented. Emphasis throughout is on phenomenology, rather than underlying mathematics or numerics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192061
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  • 8
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    The low-frequency source of Saturns kilometric radiation (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-10-05
    Description: Understanding how auroral radio emissions are produced by magnetized bodies requires in situ measurements within their source region. Saturn’s kilometric radiation (SKR) has been widely used as a remote proxy of Saturn’s magnetosphere. We present wave and plasma measurements from the Cassini spacecraft during its ring-grazing high-inclination orbits, which passed three times through the high-altitude SKR emission region. Northern dawn-side, narrow-banded radio sources were encountered at frequencies of 10 to 20 kilohertz, within regions of upward currents mapping to the ultraviolet auroral oval. The kilometric waves were produced on the extraordinary mode by the cyclotron maser instability from 6– to 12–kilo–electron volt electron beams and radiated quasi-perpendicularly to the auroral magnetic field lines. The SKR low-frequency sources appear to be strongly controlled by time-variable magnetospheric electron densities.
    Keywords: Geochemistry, Geophysics, Online Only, Planetary Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Saturns magnetic field revealed by the Cassini Grand Finale (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-10-05
    Description: During 2017, the Cassini fluxgate magnetometer made in situ measurements of Saturn’s magnetic field at distances ~2550 ± 1290 kilometers above the 1-bar surface during 22 highly inclined Grand Finale orbits. These observations refine the extreme axisymmetry of Saturn’s internal magnetic field and show displacement of the magnetic equator northward from the planet’s physical equator. Persistent small-scale magnetic structures, corresponding to high-degree (〉3) axisymmetric magnetic moments, were observed. This suggests secondary shallow dynamo action in the semiconducting region of Saturn’s interior. Some high-degree magnetic moments could arise from strong high-latitude concentrations of magnetic flux within the planet’s deep dynamo. A strong field-aligned current (FAC) system is located between Saturn and the inner edge of its D-ring, with strength comparable to the high-latitude auroral FACs.
    Keywords: Geochemistry, Geophysics, Online Only, Planetary Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Ionosphere-Thermosphere Energy Budgets for the ICME Storms of March 2013 and 2015 Estimated with GITM and Observational Proxies (2017)
    Wiley
    Details
    Publication Date: 2017-08-11
    Description: The ionosphere-thermosphere (IT) energy partitioning for the ICME storms of 16-19 March 2013 and 2015 is estimated with the Global Ionosphere-Thermosphere Model (GITM), empirical models and proxies derived from in situ measurements. We focus on auroral heating, Joule heating and thermospheric cooling. Solar wind data, F10.7, OVATION Prime model and the Weimer 2005 model are used to drive GITM from above. Thermospheric nitric oxide and carbon dioxide cooling emission powers and fluxes are estimated from TIMED/SABER measurements. AMIE estimations of hemispheric power and Joule heating are presented, based on data from global magnetometers, the AMPERE magnetic field data, SSUSI auroral images and the SuperDARN radar network. Modeled Joule heating and auroral heating of the IT system are mostly controlled by external driving in the March 2013 and 2015 storms, while NO cooling persists into the storm recovery phase. The total heating in the model is about 1000 GW to 3000 GW. Additionally, we inter-compare contributions in selected energy channels for five CME-type storms modeled with GITM. Modeled auroral heating shows reasonable agreement with AMIE hemispheric power and is higher than other observational proxies. Joule heating, NO and CO 2 cooling are likely underestimated in GITM. We discuss challenges and discrepancies in estimating and global modeling of the IT energy partitioning, especially Joule heating, during geomagnetic storms.
    Print ISSN: 1539-4964
    Electronic ISSN: 1542-7390
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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