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  • 1
    Monograph available for loan
    Monograph available for loan
    Planetary magnetism (2010)
    New York, NY [u.a.] : Springer
    Associated volumes
    Details Availability
    Call number: 5/M 18.91371
    In: Space science series of ISSI
    Type of Medium: Monograph available for loan
    Pages: 664 Seiten , Ill., graph. Darst., Kt. , 235 mm x 155 mm
    ISBN: 9781441959003
    Series Statement: Space Sciences Series of ISSI 33
    URL: Inhaltsverzeichnis
    Classification:
    Geomagnetism, Geoelectromagnetism
    Language: English
    Note: Planetary magnetism : foreword / A. Balogh ... [et al.] -- Space exploration of planetary magnetism / N.F. Ness -- Planetary magnetic field measurements : missions and instrumentation / A. Balogh -- Current systems in planetary magnetospheres and ionospheres / W. Baumjohann ... [et al.] -- Separation of the magnetic field into external and internal parts / N. Olsen, K.-H. Glassmeir, X. Jia -- The magnetic field of planet Earth / G. Hulot ... [et al.] -- Crustal magnetic fields of terrestrial planets / B. Langlais ... [et al.] -- Magnetic fields of the outer planets / C.T. Russell, M.K. Dougherty -- Magnetic fields of the satellites of Jupiter and Saturn / X. Jia ... [et al.] -- The magnetic field of mercury / B.J. Anderson ... [et al.] -- Paleomagnetic records of meteorites and early planetesimal differentiation / B.P. Weiss ... [et al.] -- Induced magnetic fields in solar system bodies / J. Saur, f.M. Neubauer, K.-H. Glassmeier -- The interior structure, composition, and evolution of giant planets / J.J. Fortney, N. Nettelmann -- Thermal evolution and magnetic field generation in terrestrial planets and satellites / D. Breuer, S. Labrosse, T. Spohn -- Theory and modeling of planetary dynamos / J. Wicht, A. Tilgner -- Laboratory dynamo experiments / G. Verhille ... [et al.] -- Dynamo scaling laws and applications to the planets / U.R. Christensen -- The solar dynamo / C.A. Jones, M.J. Thompson, S.M. Tobias -- Dynamo models for planets other than Earth / S. Stanley, G.A. Glatzmaier -- Planetary magnetic fields : achievements and prospects / D.J. Stevenson..
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    Branch Library: GFZ Library
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  • 2
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    Scaling properties of convection-driven dynamos in rotating spherical shells and application to planetary magnetic fields (2006)
    In:  Geophysical Journal International, Taipei, Elsevier, vol. 166, no. 1, pp. 97-114, pp. RG2001, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 2006
    Keywords: GeodesyY ; ConvolutionE ; Geomagnetics ; GJI ; convection ; core ; flow ; dynamo ; theory ; geomagnetic ; field ; inner ; core ; planetology
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    The influence of trench migration on slab penetration into the lower mantle (1996)
    In:  Earth planet. Sci. Lett., Taipei, Elsevier, vol. 140, no. 1-4, pp. 27-39, pp. RG2001, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1996
    Keywords: Plate tectonics ; Subduction zone ; earth mantle
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Mantle rheology, constitution, and convection (1989)
    Gordon and Breach
    In:  Professional Paper, Mantle Convection: Plate Tectonics and Global Dynamics, New York, Gordon and Breach, vol. 4, no. 16, pp. 595-655, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publication Date: 1989
    Keywords: earth mantle ; Dynamic ; ConvolutionE ; Inelastic ; Rheology ; Earth model, also for more shallow analyses !
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Joint geodynamical and seismic modelling of the Eifel plume (2006)
    In:  Geophys. J. Int., Kunming, China, Elsevier, vol. 165, no. 1, pp. 357-372, pp. L05306, (ISSN: 1340-4202)
    Details
    Publication Date: 2006
    Keywords: GeodesyY ; Modelling ; Synthetic seismograms ; ConvolutionE ; Tomography ; Teleseismic events ; Travel time ; GJI ; convection ; modelling, ; mantle ; plume, ; regional ; tomography, ; teleseismic ; traveltimes ; Wuellner ; Wullner
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    A mantle plume below the Eifel volcanic fields, Germany (2001)
    In:  Earth planet. Sci. Lett., Tokyo, Lawrence Livermore National Laboratory, vol. 186, no. 1, pp. 7-14, pp. L18610, (ISSN: 1340-4202)
    Details
    Publication Date: 2001
    Keywords: Plate tectonics ; hot ; spot ; Volcanology ; TOME ; Seismology ; Electromagnetic methods/phenomena
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    Timescales of geomagnetic secular acceleration in satellite field models and geodynamo models (2012)
    Oxford University Press
    Details
    Publication Date: 2012-05-16
    Description: SUMMARY Magnetic satellite data from the last decade allow to model geomagnetic secular acceleration, the second time derivative of the field, in a highly precise manner. Robust estimates of the secular acceleration (SA) are obtained by using order six B-Splines as representation of the field variability, which in turn allows us to estimate the characteristic SA timescale, τ SA . We confirm a recent finding that τ SA is of order 10 years and fairly independent of the spherical harmonic degree n . This contrasts with the characteristic timescale of geomagnetic secular variation τ SV , which is a decreasing function of n and is 100 yr for n ≤ 5. Conceivably the SA timescale might be related to short-term processes in the core, distinct from convective overturn whose timescale is reflected by τ SV . Previously it had been shown that dynamo simulations reproduce the shape of the secular variation (SV) spectrum and, provided their magnetic Reynolds number Rm has an Earth-like value of order 1000, also the absolute values of τ SV . The question arises if dynamo simulations can capture the observed timescales of geomagnetic SA. We determined τ SA ( n ) for a set of dynamo models, covering a range of values of the relevant control parameters. The selection of models was based on the morphological similarity of their magnetic fields to the geomagnetic field and not on criteria related to the time dependence of the field, or on any aspect of the spectra associated with their field variation. We find that τ SA depends only weakly on n up to degree 10, but for larger n it asymptotically approaches the 1/ n -dependence that is also found for τ SV ( n ). The acceleration timescale at low n varies with magnetic Reynolds number more strongly than τ SV and may also depend on magnetic field strength. For an Earth-like Rm ≈ 1000, τ SA is of order 10 yr for n ≃ 2–10, as found in the field models from satellite data. A simple scaling analysis based on the frozen flux assumption for magnetic variations suggests two contributions to the SA, an advective part that scales with velocity U and has a length scale dependence corresponding to n −1 , and a part that depends on the acceleration of the flow without explicit dependence on the length scale. Their combination can explain the spectral shape of τ SA ( n ) in numerical models, with the latter term dominating at n 〈 10. The characteristic timescale of acceleration of the near surface flow correlates with τ SA in the different numerical models and is of the same order as τ SA . This suggests that the observed 10 yr timescale of geomagnetic SA reflects the characteristic time of core flow acceleration. To explain the geomagnetic SV and SA timescales, we find that the rms velocity near the core surface must be 18 km yr −1 and the rms flow acceleration approximately 2 km yr −2 , although a statistical analysis of the induction equation suggests that most of the latter may occur at flow scales corresponding to harmonic degrees n 〉 12. The ability of dynamo models to match simultaneously SV and SA timescales suggests that dynamic processes in the core at the decadal timescale are not fundamentally different from those at the centennial timescale.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 8
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    Earth science: a sheet-metal geodynamo (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-08-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Christensen, Ulrich R -- England -- Nature. 2008 Aug 28;454(7208):1058-9. doi: 10.1038/4541058a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18756242" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 9
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    Energy flux determines magnetic field strength of planets and stars (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-01-09
    Description: The magnetic fields of Earth and Jupiter, along with those of rapidly rotating, low-mass stars, are generated by convection-driven dynamos that may operate similarly (the slowly rotating Sun generates its field through a different dynamo mechanism). The field strengths of planets and stars vary over three orders of magnitude, but the critical factor causing that variation has hitherto been unclear. Here we report an extension of a scaling law derived from geodynamo models to rapidly rotating stars that have strong density stratification. The unifying principle in the scaling law is that the energy flux available for generating the magnetic field sets the field strength. Our scaling law fits the observed field strengths of Earth, Jupiter, young contracting stars and rapidly rotating low-mass stars, despite vast differences in the physical conditions of the objects. We predict that the field strengths of rapidly rotating brown dwarfs and massive extrasolar planets are high enough to make them observable.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Christensen, Ulrich R -- Holzwarth, Volkmar -- Reiners, Ansgar -- England -- Nature. 2009 Jan 8;457(7226):167-9. doi: 10.1038/nature07626.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institut fur Sonnensystemforschung, Max Planck Strasse 2, 37191 Katlenburg-Lindau, Germany. christensen@mps.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19129842" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 10
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    Dawn at Vesta: testing the protoplanetary paradigm (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-05-15
    Description: The Dawn spacecraft targeted 4 Vesta, believed to be a remnant intact protoplanet from the earliest epoch of solar system formation, based on analyses of howardite-eucrite-diogenite (HED) meteorites that indicate a differentiated parent body. Dawn observations reveal a giant basin at Vesta's south pole, whose excavation was sufficient to produce Vesta-family asteroids (Vestoids) and HED meteorites. The spatially resolved mineralogy of the surface reflects the composition of the HED meteorites, confirming the formation of Vesta's crust by melting of a chondritic parent body. Vesta's mass, volume, and gravitational field are consistent with a core having an average radius of 107 to 113 kilometers, indicating sufficient internal melting to segregate iron. Dawn's results confirm predictions that Vesta differentiated and support its identification as the parent body of the HEDs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Russell, C T -- Raymond, C A -- Coradini, A -- McSween, H Y -- Zuber, M T -- Nathues, A -- De Sanctis, M C -- Jaumann, R -- Konopliv, A S -- Preusker, F -- Asmar, S W -- Park, R S -- Gaskell, R -- Keller, H U -- Mottola, S -- Roatsch, T -- Scully, J E C -- Smith, D E -- Tricarico, P -- Toplis, M J -- Christensen, U R -- Feldman, W C -- Lawrence, D J -- McCoy, T J -- Prettyman, T H -- Reedy, R C -- Sykes, M E -- Titus, T N -- New York, N.Y. -- Science. 2012 May 11;336(6082):684-6. doi: 10.1126/science.1219381.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, USA. ctrussell@igpp.ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22582253" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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