Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/3835| DC Field | Value | Language |
|---|---|---|
| dc.contributor.authorall | De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
| dc.contributor.authorall | Cafarella, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
| dc.contributor.authorall | Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
| dc.date.accessioned | 2008-04-28T07:13:58Z | en |
| dc.date.available | 2008-04-28T07:13:58Z | en |
| dc.date.issued | 1998-02-01 | en |
| dc.identifier.uri | http://hdl.handle.net/2122/3835 | en |
| dc.description.abstract | A recent examination of the geomagnetic element annual mean values fbr the European magnetic observatories, has shown the existence of a sudden change in the secular acceleration at about 1991. In this work the space time character of the 1991 impulse is investigated and its worldwide character is evidenced; an evaluation of the amplitude spatial distribution is given for the Y component, analysing data relative to 74 magnetic observatories. The external effects were removed from the annual mean data and successively the Y secular variation has been evaluated from the corrected annual means. Moreover the worldwide character of the intensity of the step in the second time derivative is compared with the character of the previous well known jerk events of 1969 and 1978. | en |
| dc.language.iso | English | en |
| dc.publisher.name | AGU | en |
| dc.relation.ispartof | Geophysical Research Letters | en |
| dc.relation.ispartofseries | 3 /25 (1998) | en |
| dc.subject | Geomagnetic field | en |
| dc.subject | Secular variation | en |
| dc.subject | Geomagnetic jerk | en |
| dc.title | Worldwide character of the 1991 geomagnetic jerk | en |
| dc.type | article | en |
| dc.description.status | Published | en |
| dc.type.QualityControl | Peer-reviewed | en |
| dc.description.pagenumber | 377-380 | en |
| dc.subject.INGV | 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals | en |
| dc.relation.references | Alexandrescu, M., D. Gilbert, G. Hulot, J. L. Le MouE1, and G. Saracco, Worlwide wavelet analysiso f geomagneticje rks, J. Geophys.R es., 101, 21975-21994, 1996. BarracloughD, . R., J. M. Harwood,B . R. Leaton,a nd S. R. C. Malin, A modelo f the geomagneticfi eld at 1975, GeophysJ. . R. Astr. Soc.,4 3, 645-649, 1975. BarracloughD, . R., J. M. Harwood,B . R. Leaton,a nd S. R. C. Malin, A definitive model of the geomagneticfi eld and its secularv ariationf or 1965 I: derivation of the model and comparison with the IGRF, GeophysJ. . R. astr. Soc.,5 5, 111-121, 1978. Cafarella,L ., and A. Meloni, Evidence for a geomagneticje rk in 1990 acrossE urope,A nnali di GeofisicaX, XXVIII, 451-455, 1995. Courtillot, V., J. Ducruix, and J. L. Le MouE1, Sur une acc616ration r6cente de la variation s6culaire du champ magn6tique terrestre, C. R. Hebd. sdances Acad. Sci. Set. D., 287, 1095-1098, 1978. Ducruix, J., C. Gire, and J. L. Le MouEl, Existence et caractere planetarie d'une secousse de la variation s6culaire du champ g6omagn6tiquen 1912-1913, C. R. Acad. Sci. Paris Set. B 296, 1419-24, 1983. Gavoret, J., D. Gibert, M. Menvielle, and J. L. Le MouEl, Long-term variations of the external and internal components of the Earth's magneticf ield, J. GeophysR. es., 91, 4787-4796, 1986. Le MouEl J. L., J. Ducruix, and C. H. Duyen, The worldwide character of the 1969-1970 impulse of the secular acceleration rate, Physics Earth Planet. Interiors, 28, 337-350,1982. MacMillan S., A geomagnetijce rk for the early 1990's, Earth and Plan. Sci. Lett., 137, 189-192, 1996. Malin, S. R. C., and B. M. Hodder, Was the 1970 geomagnetic jerk of internal or external origin?, Nature, 296, 726-729, 1982. Malin, S. R. C., B. M. Hodder, and D. R. Barraclough, Geomagnetic secular variation:a jerk in 1970, in ContributioneCs ientificasP ara Commemora el 75 Aniversario del Observatorio del Ebro Publicaciones del Observatorio del Ebro Memoria NO. 14, 239-256, 1983. Stewart, D. N., and K. A. Whaler, Geomagnetic disturbance fields: an analysis of observatory monthly means, Geophys. J. lnt., 108, 215- 223, 1992. Stewart, D. N., and K. A. Whaler, Optimal piecewise regression analysisa nd its applicationt o geomagnetict ime series,G eophys.J . Int., 121,710-724, 1995. | en |
| dc.description.obiettivoSpecifico | 3.4. Geomagnetismo | en |
| dc.description.journalType | JCR Journal | en |
| dc.description.fulltext | reserved | en |
| dc.contributor.author | De Michelis, P. | en |
| dc.contributor.author | Cafarella, L. | en |
| dc.contributor.author | Meloni, A. | en |
| dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
| dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | 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 | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
| crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
| crisitem.author.orcid | 0000-0002-2708-0739 | - |
| crisitem.author.orcid | 0000-0003-2005-8923 | - |
| crisitem.author.orcid | 0000-0003-1155-401X | - |
| crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| 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 | - |
| crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
| Appears in Collections: | Article published / in press | |
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