Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5167
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dc.contributor.authorallTozzi, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.authorallDe Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.authorallMeloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.date.accessioned2009-09-08T08:13:04Z-
dc.date.available2009-09-08T08:13:04Z-
dc.date.issued2009-08-08-
dc.identifier.urihttp://hdl.handle.net/2122/5167-
dc.description.abstractThe occurrence of geomagnetic jerks over the Arctic and Antarctic regions is here investigated. Maps of geomagnetic secular acceleration over the polar regions are produced from the CM4 and CHAOS models and the occurrence of geomagnetic jerks is associated with jumps in secular acceleration. The obtained results confirm that in Antarctica geomagnetic jerks systematically follow geomagnetic jerks in the Arctic region with a time delay from one to three years. Evidence is found of an abrupt change in secular acceleration in both polar regions around 1985, suggesting that the 1985 local jerk could actually be a worldwide event. Combining our results with the results previously obtained on the occurrence of a geomagnetic jerk at low-mid latitudes around 2003, we support the hypothesis of a global extension of an event occurred at the beginning of the 21st century.en
dc.language.isoengen
dc.publisher.nameAGUen
dc.relation.ispartofGeophysical Research Lettersen
dc.relation.ispartofseries/36 (2009)en
dc.subjectgeomagnetic jerksen
dc.subjectmagnetic global modelsen
dc.subjectgeomagnetic secular variationen
dc.titleGeomagnetic jerks in the polar regionsen
dc.typearticle-
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumberL15304en
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversalsen
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional modelsen
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic fielden
dc.identifier.doi10.1029/2009GL039359en
dc.relation.referencesAlexandrescu, M., D. Gibert, G. Hulot, J. L. Moue¨l, and G. Saracco (1995), Detection of geomagnetic jerks using wavelet analysis, J. Geophys. Res., 100, 12,557– 12,572. Alexandrescu, M., D. Gibert, G. Hulot, J. L. Moue¨l, and G. Saracco (1996), Worldwide wavelet analysis of geomagnetic jerks, J. Geophys. Res., 101, 21,975– 21,994. Chambodut, A., and M. Mandea (2005), Evidence for geomagnetic jerks in comprehensive models, Earth Planets Space, 57, 139– 149. Chambodut, A., C. Eymin, and M. Mandea (2007), Geomagnetic jerks from the Earth’s surface to the top of the core, Earth Planets Space, 59, 675– 684. De Michelis, P., and R. Tozzi (2005), A local intermittency measure (LIM) approach to the detection of geomagnetic jerks, Earth Planet. Sci. Lett., 235, 261– 272, doi:10.1016/j.espl.2005.04.001. De Michelis, P., L. Cafarella, and A. Meloni (1998),Worldwide character of the 1991 geomagnetic jerk, Geophys. Res. Lett., 25, 377–380. Kotze´, P. (2003), The time-varying geomagnetic field of southern africa, Earth Planets Space, 55, 111–116. Malin, S., and B. Hodder (1982),Was the 1970 geomagnetic jerk of internal or external origin?, Nature, 296, 726–728. Mandea, M., E. Bellanger, and J. L. Moue¨l (2000), A geomagnetic jerk for the end of the 20th century?, Earth Planet. Sci. Lett., 183, 369– 373. Olsen, N., and M. Mandea (2007), Investigation of a secular variation impulse using satellite data: The 2003 geomagnetic jerk, Earth Planet. Sci. Lett., 255, 94– 105, doi:10.1016/j.epsl.2006.12.008. Olsen, N., and M. Mandea (2008), Rapidly changing flows in the Earth’s core, Nat. Geosci., 1, 390–394, doi:10.1038/ngeo203. Olsen, N., H. Lu¨hr, T. Sabaka, M. Mandea, M. Rother, L. Tofner-Clausen, and S. Choi (2006), CHAOS-a model of the earth’s magnetic field derived from CHAMP, Ørsted, and SAC-C magnetic satellite data, Geophys. J. Int., 166, 67–75, doi:10.1111/j.1365-246X.2006.02959.x. Pinheiro, K., and A. Jackson (2008), Can a 1-D mantle electrical conductivity model generate magnetic jerk differential time delays?, Geophys. J. Int., 173, 781–792, doi:10.1111/j.1365-246X.2008.03762.x. Sabaka, T., N. Olsen, and R. Langel (2002), A comprehensive model of the quiet-time, near-Earth magnetic field: Phase 3, Geophys. J. Int., 151, 32–68. Sabaka, T., N. Olsen, and M. Purucker (2004), Extending comprehensive models of the Earth’s magnetic field with Ørsted and CHAMP data, Geophys. J. Int., 159, 521– 547. Wessel, P., and W. H. F. Smith (1991), Free software helps map and display data, Eos Trans. AGU, 72(41), 441.en
dc.description.obiettivoSpecifico3.4. Geomagnetismoen
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorTozzi, R.-
dc.contributor.authorDe Michelis, P.-
dc.contributor.authorMeloni, A.-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
item.grantfulltextrestricted-
item.fulltextWith Fulltext-
crisitem.classification.parent04. Solid Earth-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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