Acta Geodaetica et Geophysica Hungarica

, Volume 42, Issue 4, pp 433–448 | Cite as

Variation in the rotation rate of the earth and the geomagnetic field

  • P. Varga
  • Z. Bus
  • B. Süle
  • A. Schreider
  • C. Bizouard
  • D. Gambis
  • C. Denis
Article
  • 38 Downloads

Abstract

In its first part this work focuses on connection of length of day (LOD) with centered and eccentric geomagnetic dipole fields described with the use of Gaussian coefficients derived from global geomagnetic observations is discussed for the epoch 1900–2000. The statistical comparison of temporal variation of earth magnetic and astronomical data shows close correlation of geomagnetic dipole momentum M 0 and ΔLOD. It should be mentioned that the time-correlation is closer when the centred geomagnetic dipole is used for statistical modelling. In the same time no relation was found between ΔLOD and the orientation variations of the geomagnetic dipole.

In the second part of present study the connection of geomagnetic field and the LOD is investigated in geological time-scale. A significant ΔLOD was found which coincides in time with the geomagnetic Mesozoic low. The reason of this coincidence is enigmatic.

Keywords

centered geomagnetic dipole field earth rotation eccentric geomagnetic dipole field length of day 

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References

  1. Abarca del Rio R, Gambis D, Salstein D, Nelson D, Dai A 2003: J. Geodyn., 36, 423–443.CrossRefGoogle Scholar
  2. Bloxham J 2000: Nature, 405, 63–65.CrossRefGoogle Scholar
  3. Darwin G H 1899: Mon. Not. R. Astron. Soc., 60, 82–124.Google Scholar
  4. Denis C 1989: In: Gravity and low-frequency geodynamics. Teisseyre ed., PWN-Elsevier, 111–186.Google Scholar
  5. Denis C, Schreider A A, Varga P, Závoti J 2002: J. Geodyn., 34, 667–685.CrossRefGoogle Scholar
  6. Gubbins D, Alfé D, Masters G, Price G D, Gillan M J 2003: Geophys. J. Int., 155, 609–622.CrossRefGoogle Scholar
  7. Labrosse S, Poirier J-P, Le Mouël 2001: Earth Planet. Sci. Lett., 190, 111–135.CrossRefGoogle Scholar
  8. Lay T, Williams Q, Garnero E J 1998: Nature, 392, 461–463.CrossRefGoogle Scholar
  9. Mound J E, Buffett B A 2006: Earth Planet. Sci. Lett., 243, 383–389.CrossRefGoogle Scholar
  10. Scherbakov V P, Solodovnikov G M, Sycheva N K 2002: Izvestysia Phys. Earth, 38,2, 113–119.Google Scholar
  11. Schreider A A, Schreider Al A, Varga P, Denis C 2005: Oceanology, 45,5, 785–789.Google Scholar
  12. Selkin P A, Tauxe L 2000: Phil. Trans. R. Soc. London, A,358, 1065–1080.Google Scholar
  13. Stephenson F R, Morrison L V 1984: Phil. Trans. R. Soc. London, A 313, 47–70.Google Scholar
  14. Varga P, Denis C, Varga T 1997: J. Geodyn., 25, 61–84.CrossRefGoogle Scholar
  15. Varga P, Závoti J, Denis C, Schreider A A 2002: Complex interpretation of the Earth despinning history. In: Contributions of the IAG Scientific Conference “Vistas for geodesy in the new millenium”. J Ádám and P Schwartz eds, Springer Verlag, 417–422.Google Scholar
  16. Yokohama Y, Yukutake T 1992: J. Geomag. Geoelectr., 44, 555–560.CrossRefGoogle Scholar
  17. Yukutake T 1972: J. Geomag. Geoelectr., 24, 19–26.CrossRefGoogle Scholar
  18. Zharkov V N, Molodensky S M, Brzeziński A, Groten E, Varga P 1996: The Earth and its rotation. Low frequency geodynamics. Wichmann Verlag, HeidelbergGoogle Scholar
  19. Zonenshain L P, Kuzmin M I 1997: Paleogeodynamics. The plate tectonic evolution of the Earth. American Geophysical Union, WashingtonGoogle Scholar

Copyright information

© Akadémiai Kiadó 2007

Authors and Affiliations

  • P. Varga
    • 1
  • Z. Bus
    • 1
  • B. Süle
    • 1
  • A. Schreider
    • 2
  • C. Bizouard
    • 3
  • D. Gambis
    • 3
  • C. Denis
    • 4
  1. 1.Seismological ObservatoryGeodetic and Geophysical Research InstituteBudapestHungary
  2. 2.Shirsov Institute of OceanologyMoscowRussia
  3. 3.Observatoire de ParisInternational Earth Rotation Service EOP PCParisFrance
  4. 4.Musée National d’Historie Naturelle de Luxembourg and European Centre for Geodynamics and SeismologyWalferdangeLuxembourg

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