Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/3944
DC Field | Value | Language |
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dc.contributor.authorall | De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.authorall | Barraclough, D. R.; British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK | en |
dc.contributor.authorall | Tozzi, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.date.accessioned | 2008-07-08T13:30:12Z | en |
dc.date.available | 2008-07-08T13:30:12Z | en |
dc.date.issued | 2003-02-25 | en |
dc.identifier.uri | http://hdl.handle.net/2122/3944 | en |
dc.description.abstract | Many natural phenomena show a relationship between their spatial and temporal Fourier spectra. This paper discusses such a connection for the geomagnetic field, when some assumptions are made about the (exponential or power-law) behaviour of the spatial power spectrum of the field itself and that of its time derivative (the spatial spectrum of the secular variation) as estimated from global geomagnetic field models. It is shown that, under either assumption, the temporal spectrum of the geomagnetic field computed at the core–mantle boundary (CMB) would have a power-law behaviour with a negative spectral exponent of about 0.5. At the Earth’s surface, although the temporal spectrum obtained from the power-law spatial model assumes a slightly more complicated form, it can be practically approximated with a power law with a negative exponent of about 3.6. Analysis of magnetic observatory data confirms these results and that the starting hypotheses are reasonable, especially in view of the possibly chaotic state of the dynamical processes underlying the generation and maintenance of the geomagnetic field. | en |
dc.language.iso | English | en |
dc.publisher.name | Elsevier | en |
dc.relation.ispartof | Physics of the Earth and Planetary Interiors | en |
dc.relation.ispartofseries | 2-3 / 135 (2003) | en |
dc.subject | Geomagnetic field spectra | en |
dc.subject | Secular variation | en |
dc.subject | Persistence times | en |
dc.title | Spatial and temporal spectra of the geomagnetic field and their scaling properties | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 125-134 | en |
dc.subject.INGV | 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field | en |
dc.identifier.doi | 10.1016/S0031-9201(02)00211-X | en |
dc.relation.references | Backus, G., Parker, R., Constable, C., 1996. Foundations of Geomagnetism. Cambridge University Press, Cambridge. Barraclough, D.R., De Santis, A., 1997. Some possible evidence for a chaotic geomagnetic field from observational data. Phys. Earth Planet. Inter. 99, 207–220. De Santis, A., Barraclough, D.R., 1996. A note on two expressions for the spatial power spectrum of the geomagnetic field. Ann. Geofis. 39, 529–531. De Santis, A., Tozzi, R., Barraclough, D.R., 2002. Non-linear variability in the geomagnetic secular variation of the last 150 years. Fractals 10, 297–303. Frisch, U., 1995. Turbulence. The Legacy of A. N. Kolmogorov. Cambridge University Press, Cambridge. Hongre, L., Hulot, G., Khokhlov, A., 1998. An analysis of the geomagnetic field over the past 2000 years. Phys. Earth Planet. Inter. 106, 311–335. Hulot, G., Le Mouël, J.L., 1994. A statistical approach to the Earth’s main magnetic field. Phys. Earth Planet. Inter. 82, 167– 183. Jensen, H.J., 1998. Self-Organized Criticality. Emergent Complex Behaviours in Physical and Biological Systems. Cambridge Lecture Notes in Physics, Cambridge University Press. Langel, R.A., Estes, R.H., 1982. A geomagnetic field spectrum. Geophys. Res. Lett. 9, 250–253. Lowes, F.J., 1974. Spatial power spectrum of the main geomagnetic field, and extrapolation to the core. Geophys. J. R. Astr. Soc. 36, 717–730. Mandea, M., Macmillan, S., 2000. IGRF: the eighth generation. Earth Planets Space 52, 1119–1124. McLeod, M.G., 1996. Spatial and temporal power spectra of the geomagnetic field. J. Geophys. Res. 101 (B2), 2745– 2763. McWilliams, J.C., 1984. The emergence of isolated coherent vortices in turbulent flow. J. Fluid Mech. 146, 21–43. Merrill, R.T., McElhinny, M.W., McFadden, P.L., 1996. The Magnetic Field of the Earth. Academic Press, San Diego. Nayfeh, A.H., Balachandran, B., 1995. Applied Nonlinear Dynamics. Wiley, New York. Roberts, P.H., Glatzmaier, G.A., 2000. A test of the frozen-flux approximation using a new geodynamo model. Phil. Trans. R. Soc. London A 358, 1109–1121. Stacey, F.D., 1992. Physics of the Earth. Brookfield Press, Brisbane. Voorhies, C.V., 1992. Steady Motional Induction of Geomagnetic Chaos. NASA Technical Paper 3272, IA, pp. 1–28. | en |
dc.description.obiettivoSpecifico | 3.4. Geomagnetismo | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | reserved | en |
dc.contributor.author | De Santis, A. | en |
dc.contributor.author | Barraclough, D. R. | en |
dc.contributor.author | Tozzi, R. | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.department | British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.dept | British Geological Survey, Edinburgh, U. K. | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.orcid | 0000-0002-3941-656X | - |
crisitem.author.orcid | 0000-0002-1836-4078 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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