An estimate of average lower mantle conductivity by wavelet analysis of geomagnetic jerks

Journal of Geophysical Research: Solid Earth

Volumn 104, Issue B8, 1999, Pages 17735-17745

  Alexandrescu, Mioara Mandea ^a   Gibert, Dominique ^b,c   Le Mouël, Jean Louis ^a   Hulot, Gauthier ^a   Saracco, Ginette ^b,c  

^a INSTITUT DE PHYSIQUE DU GLOBE DE PARIS   (France)

^b CNRS   (France)

^c UNIVERSITÉ DE RENNES 1   (France)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRICAL CONDUCTIVITY; GEOMAGNETIC FIELD; LOWER MANTLE;

EID: 0001408969     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: 10.1029/1999jb900135     Document Type: Article

References (44)

1. Achache, J., V. Courtillot, J. Ducruix, and J.-L. Le Mouël, The late 1960's secular variation impulse: further constraints on deep mantle conductivity, Phys. Earth Planet. Inter., 23, 72-75, 1980.
2. Achache, J., J.-L. Le Mouël, and V. Courtillot, Long-period geomagnetic variations and mantle conductivity: An inversion using Bailey's method, Geophys. J. R. Astron. Soc., 65, 579-601, 1981.
3. Alexandrescu, M., D. Gibert, G. Hulot, J.-L. Le Mouël, and G. Saracco, Detection of geomagnetic jerks using wavelet analysis, J. Geophys. Res., 100, 12557-12572, 1995.
4. Alexandrescu, M., D. Gibert, G. Hulot, J.-L. Le Mouël, and G. Saracco, Worldwide wavelet analysis of geomagnetic jerks, J. Geophys. Res., 101, 21975-21994, 1996.
5. Backus, G.E., Application of mantle filter theory to the magnetic jerk of 1969, Geophys. J. R. Astron. Soc., 74, 713-746, 1983.
6. Backus, G.E., R.L. Parker, and C. Constable, Foundations of Geomagnetism, 369 pp., Cambridge Univ. Press, New York, 1996.
7. Benton, E., and K. Whaler, Rapid diffusion of the poloidal geomagnetic field through the weakly conducting mantle: A perturbation solution, Geophys. J. R. Astron. Soc., 75, 77-100, 1983.
8. Buffett, B., T. Herring, P. Mathews, and I. Shapiro, Anomalous dissipation in the Earth's forced nutation: Inferences on electrical conductivity at the core-mantle boundary, Eos Trans. AGU, 71, 496, 1990.
9. Constable, S., Constraints on mantle electrical conductivity from field and laboratory measurements, J. Geomagn. Geoelectr., 45, 707-728, 1993.
10. Courtillot, V., and J.-L. Le Mouël, Geomagnetic secular variation impulses, Nature, 311, 709-716, 1984.
11. Courtillot, V., J. Ducruix, and J.-L. Le Mouël, Sur une accélération récente de la variation séculaire du champ magnétique terrestre, C. R. Acad. Sci., Ser. D, 287, 1095-1098, 1978.
12. Courtillot, V., J.-L. Le Mouël, and J. Ducruix, On Backus' mantle filter theory and the 1969 geomagnetic impulse, Geophys. J. R. Astron. Soc., 78, 619-625, 1984.
13. De Michelis, P., L. Cafarella, and A. Meloni, Worldwide character of the 1991 jerk, Geophys. Res. Lett., 25, 377-380, 1998.
14. Ducruix, J., V. Courtillot, and J.-L. Le Mouël, The late 1960s secular variation impulse, the 11 year magnetic variation and the electrical conductivity of the deep mantle, Geophys. J. R. Astron. Soc., 61, 73-94, 1980.
15. Gavoret, J., D. Gibert, M. Menvielle, and J.-L. Le Mouël, Long-term variations of the external and internal components of the Earth's magnetic field, J. Geophys. Res., 91, 4787-4796, 1986.
16. Golovkov, V.P., T.I. Zvereva, and A.O. Simonyan, Common feature and differences between "jerks" of 1947, 1958, and 1969, Geophys. Astrophys. Fluid Dyn., 49, 81-96, 1989.
17. Grossmann, A., Wavelet transform and edge detection, in Stochastic Processes in Physics and Engineering, edited by M. Hazewinkel, pp. 149-157, D. Reidel, Norwell, Mass., 1986.
18. Gubbins, D., Geomagnetic field analysis, II, Secular variation consistent, with a perfectely conducting core, Geophys. J. R. Astron. Soc., 77, 753-766, 1984.
19. Gubbins, D., and L. Tomlinson, Secular variation from monthly means from Apia and Amberley magnetic observatories, Geophys. J. R. Astron. Soc., 86, 603-616, 1986.
20. Holschneider, M., Wavelets: An analysis tool, 423pp., Oxford Univ. Press, New York, 1995.
21. Hulot, G., J.-L. Le Mouël, and J. Wahr, Taking into account truncation problems and geomagnetic model accuracy in assessing computed flows at the core-mantle boundary, Geophys. J. Int., 108, 224-246, 1992.
22. Katsura T., K. Sato, and E. Ito, Electrical conductivity of silicate perovskite at lower-mantle conditions, Nature, 395, 493-495, 1998.
23. Kerridge, D. J., and D.R. Barraclough, Evidence for geomagnetic jerks from 1931 to 1971, Phys. Earth Planet. Inter., 39, 228-236, 1985.
24. Laj, C., A. Mazaud, R. Weeks, M. Fuller, and E. Herrero-Bervera, Geomagnetic reversal paths, Nature, 351, 447, 1991.
25. Le Huy, M., M. Alexandrescu, G. Hulot, and J.-L. Le Mouël, On the characteristics of successive geomagnetic jerks, Earth Planets Space, 50, 723-732, 1998.
26. Le Mouël, J.-L., L'induction dans le globe, in Traité de Géophysique Interne, vol. 2, edited by J. Coulomb and G. Jobert, pp. 129-158, Masson, Paris, Vol. 2, 1976.
27. Le Mouël, J.-L., G. Hulot, and J.-P. Poirier, Core-mantle interaction, in Earth's Deep Interior, edited by D.J. Crossley, pp. 197-221, Gordon and Breach, New York, 1997.
28. Macmillan, S., A geomagnetic jerk for the early 1990's, Earth Planet. Sci. Lett., 137, 189-192, 1996.
29. Malin, S., and B. Hodder, Was the 1970 geomagnetic jerk of internal or external origin?, Nature, 296, 726-728, 1982.
30. Malin, S., B. Hodder, and D. Barraclough, Geomagnetic secular variation: A jerk in 1970, Ebro Obs. Mem. Publ., 14, 239-256, 1983.
31. McLeod, M.G., Signals and noise in magnetic observatory annual means: Mantle conductivity and jerks, J. Geophys. Res., 97, 17261-17290, 1992.
32. McLeod, M.G., Magnetospheric and ionospheric signals in magnetic observatory monthly means: electrical conductivity of the deep mantle, J. Geophys. Res., 99, 13577-13590, 1994.
33. Petersons, H.F., and S. Constable, Global mapping of the electrically conductive lower mantle, Geophys. Res. Lett., 23, 1461-1464, 1996.
34. Petiau, G., La Théorie des Fonctions de Bessel, 477 pp., Cent. Nat. de Rech. Sci., Paris, 1955.
35. Poirier, J.-P., and J.-L. Le Mouël, Does infiltration of the core into the lower mantle affect the observed geomagnetic field?, Phys. Earth Planet. Inter., 73, 29-37, 1992.
36. Poirier, J.-P., and J. Peyronneau, Experimental determination of the electrical conductivity of the material of the Earth's lower mantle, in High-Pressure Research: Application to Earth and Planetary Sciences, Geophys Monogr. Ser., vol. 67, edited by Y. Syono and M. Manghnani, pp. 77-87, AGU, Washington, D.C., 1992.
37. Poirier, J.-P., A. Goddat, and J. Peyronneau, Ferric iron dependence of the electrical conductivity of the Earth's lower mantle material, Philos. Trans. R. Soc. London, Ser. A, 354, 1361-1369, 1996.
38. Poirier, J.-P., V. Malavergne, and J.-L. Le Mouël, Is there a thin electrically conducting layer at the base of the mantle?, in The Core-Mantle Boundary Region, Geodyn. Ser., vol. 28, edited by M. Gurniset al., pp. 131-137, AGU, Washington, D.C., 1998.
39. Runcorn, S.K., The electrical conductivity of the Earth's mantle, Eos Trans. AGU, 36, 191-198, 1955.
40. Runcorn, S.K., Polar path in geomagnetic reversals, Nature, 356, 654-656, 1992.
41. Shankland, T.J., J. Peyronneau, and J.-P. Poirier, Electrical conductivity of the Earth's lower mantle, Nature, 366, 453-455, 1993.
42. Smylie, D.E., Magnetic diffusion in a spherically-symmetric conducting mantle, Geophys. J. R. Astron. Soc., 9, 169-184, 1965.
43. Stewart, D.N., and K.A. Whaler, Geomagnetic disturbance fields: An analysis of observatory monthly means, Geophys. J. Int., 108, 215-223, 1992.
44. Whaler, K.A., A new method for analysing geomagnetic impulses, Phys. Earth. Planet. Inter., 48, 221-240, 1987.