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Littérature scientifique sur le sujet « Geomagnetic field variations and reversals »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Geomagnetic field variations and reversals"

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Kocharov, G. E., A. V. Blinov, A. N. Konstantinov et V. A. Levchenko. « Temporal 10Be and 14C Variations : A Tool for Paleomagnetic Research ». Radiocarbon 31, no 2 (1989) : 163–68. http://dx.doi.org/10.1017/s0033822200044829.

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Temporal variations of cosmogenic radionuclide atmospheric concentrations can be caused by such global phenomena as solar activity and geomagnetic field changes as well as atmospheric circulation processes. These causes can be distinguished by the comparison of several isotope records corresponding to the same time period. We discuss a possibility for reconstructing the geomagnetic moment during the last 30,000 years from the comparison of 10Be and 14C concentrations in terrestrial archives. The results agree with conventional paleomagnetic data and promise to enrich our knowledge of geomagnetic field variations and reversals.
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Kočí, Alois, et A. Janáčková. « Variations of the geomagnetic field at the time of reversals ». Studia Geophysica et Geodaetica 29, no 3 (septembre 1985) : 280–89. http://dx.doi.org/10.1007/bf01638439.

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Dobretsov, N. L., D. V. Metelkin et A. N. Vasilevskiy. « Typical Characteristics of the Earth’s Magnetic and Gravity Fields Related to Global and Regional Tectonics ». Russian Geology and Geophysics 62, no 1 (1 janvier 2021) : 6–24. http://dx.doi.org/10.2113/rgg20204261.

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Abstract —We present a summary and analysis of current views on the magnetic and gravity fields of the Earth as a reflection of global and regional tectonic processes. The discussion concerns the probable interconnection between the distribution of the geomagnetic field characteristics, gravity anomalies and the manifestations of mantle plume magmatism as the most remarkable geologic indicator of deep geodynamics. We demonstrate that the distribution of the characteristics of the main geomagnetic field has a qualitative similarity to anomalies of the gravity field. Brief variations of the geomagnetic field are due to high-frequency oscillations in the ionosphere, do not affect the general state of the field, and are useless when considering issues of global tectonics. On the contrary, variations with long periodicities, first of all geomagnetic reversals, can be among the main indicators of the evolution of the geodynamo – the heat mechanism controlling the entire series of global tectonic processes. The frequency of reversals is determined by the intensity of mantle plumes that cause the cooling of the core, increase the convection rate in the asthenosphere, and respectively, the periodic changes in the tectonosphere. We assume the existence of three modes of behavior for this system. The first one corresponds to steady convection, in which reversals are extremely rare or do not happen at all. These episodes – superchrons – compose no more than 20% of the duration of the Phanerozoic. The second mode occurs significantly more often in the geologic history and is characterized by active convection with frequent reversals happening at least once every 5 Myr. Finally, the third mode, which is rare for the Phanerozoic but was probably more prevalent in the early Precambrian, corresponds to hyperactive turbulent convection, when the frequency of reversals reached 20 and possibly more during one million years. Although the demonstrated qualitative similarity in the position of extreme values of the main geomagnetic field, the centers of free air gravity anomalies, and manifestations of large igneous provinces does not yet have a credible explanation, we consider it to be fundamental and requiring special study and detailed elaboration.
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Maffei, Stefano, Philip W. Livermore, Jon E. Mound, Sam Greenwood et Christopher J. Davies. « Fast Directional Changes during Geomagnetic Transitions : Global Reversals or Local Fluctuations ? » Geosciences 11, no 8 (28 juillet 2021) : 318. http://dx.doi.org/10.3390/geosciences11080318.

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Paleomagnetic investigations from sediments in Central and Southern Italy found directional changes of the order of 10∘ per year during the last geomagnetic field reversal (which took place about 780,000 years ago). These values are orders of magnitudes larger than what is expected from the estimated millennial timescales for geomagnetic field reversals. It is yet unclear whether these extreme changes define the timescale of global dipolar change or whether they indicate a rapid, but spatially localised feature that is not indicative of global variations. Here, we address this issue by calculating the minimum amount of kinetic energy that flows at the top of the core required to instantaneously reproduce these two scenarios. We found that optimised flow structures compatible with the global-scale interpretation of directional change require about one order of magnitude more energy than those that reproduce local change. In particular, we found that the most recently reported directional variations from the Sulmona Basin, in Central Italy, can be reproduced by a core-surface flow with rms values comparable to, or significantly lower than, present-day estimates of about 8 to 22 km/y. Conversely, interpreting the observations as global changes requires rms flow values in excess of 77 km/y, with pointwise maximal velocities of 127 km/y, which we deem improbable. We therefore concluded that the extreme variations reported for the Sulmona Basin were likely caused by a local, transient feature during a longer transition.
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Merrill, R. T., et P. L. McFadden. « Secular variation and the origin of geomagnetic field reversals ». Journal of Geophysical Research 93, B10 (1988) : 11589. http://dx.doi.org/10.1029/jb093ib10p11589.

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Ryan, David A., et Graeme R. Sarson. « A coupled low order dynamo/turbulent shell model for geomagnetic field variations and reversals ». Physics of the Earth and Planetary Interiors 188, no 3-4 (octobre 2011) : 214–34. http://dx.doi.org/10.1016/j.pepi.2011.09.003.

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Ultré-Guérard, Pascale, et José Achache. « Core flow instabilities and geomagnetic storms during reversals : The Steens Mountain impulsive field variations revisited ». Earth and Planetary Science Letters 135, no 1-4 (octobre 1995) : 91–99. http://dx.doi.org/10.1016/0012-821x(95)00149-7.

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MOCHIZUKI, Nobutatsu, et Hideo TSUNAKAWA. « Geomagnetic Field Variations at the Beginning of the Polarity Reversal ». Journal of Geography (Chigaku Zasshi) 114, no 2 (2005) : 194–200. http://dx.doi.org/10.5026/jgeography.114.2_194.

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Pal, Poorna C. « The palaeogeomagnetic field strength, variations in reversal frequency, and geomagnetic dynamo models ». Geophysical & ; Astrophysical Fluid Dynamics 44, no 1-4 (décembre 1988) : 189–205. http://dx.doi.org/10.1080/03091928808208885.

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Abrahamsen, Niels, et Peter W. Readma. « Geomagnetic secular variation in Late Weichselian Allerød sediments from Nr. Lyngby (Denmark) ». Bulletin of the Geological Society of Denmark 44 (15 mars 1997) : 45–58. http://dx.doi.org/10.37570/bgsd-1998-44-03.

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Palaeomagnetic measurements on 400 specimens from lake sediments exposed in the cliff of the classic Late Glacial Allerød site at Nørre Lyngby in North Jutland, Denmark, are presented. Two profiles in the 7 m sequence of sand, silt and gyttja, spanning the time interval between c. 12 000 and c. 10 700 BP show about 5 cycles in the declination and about 2 cycles in inclination. Secular variation features as observed at this site are also recognizable at sites in southern Sweden and Soviet Karelia. Comparisons with Holocene records indicate that the short time-scale behaviour (i.e. < 103 y) of the geomagnetic field appears to have been similar since 14 000 BP, i.e. for a period considerably longer than the timescale of the variations themselves, thus suggesting that this type of behaviour is a permanent feature of the geomagnetic field. These secular variation features may be useful in local as well as more regional stratigraphical correlations for the Late Glacial and Holocene on a much more detailed timescale than is obtained from the magnetic reversal timescale used for older materials.
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Thèses sur le sujet "Geomagnetic field variations and reversals"

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McMillan, David G. « Statistical analyses of geomagnetic dipole variations, reversals and geodynamo simulations / ». Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3090447.

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Ménabréaz, Lucie. « Production atmosphérique du nucléide cosmogénique 10 Be et variations de l'intensité du champ magnétique terrestre au cours des derniers 800 000 ans ». Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4316/document.

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Parmi les méthodes de reconstitution de l'histoire du champ géomagnétique, l'étude des variations de la production atmosphérique d'isotopes cosmogéniques s'est récemment développé. Cette production est modulée au premier ordre et aux échelles multimillénaires par l'intensité du champ géomagnétique. Son enregistrement dans les archives de l'environnement terrestre en apporte une lecture indépendante, donc complémentaire des méthodes paléomagnétiques. Ce travail vise à retracer les changements de taux de production de 10Be enregistrés dans les sédiments marins, afin de restituer les variations du moment géomagnétique depuis environ 800 000 ans. Les rapports 10Be/9Be authigéniques mesurés par Spectrométrie de Masse par Accélérateur le long de trois séquences de différentes latitudes, permettent de caractériser la production globale de 10Be sur deux intervalles de temps. (1) Lors de la baisse du moment dipolaire associée à l'excursion Laschamp (~41 000 ans BP), la surproduction de 10Be à 38°N et 2°S, confirmée par des mesures de 10Be/230Thxs, est identique à celle restituée dans les glaces du Groenland. (2) L'étude menée sur une carotte prélevée à l'équateur couvrant l'intervalle 800 000 – 250 000 ans BP (époque Brunhes), révèle les phases successives de surproduction globale de 10Be déclenchées par les chutes de moment dipolaires liées à l'inversion Brunhes-Matuyama d'une part et d'autre part à une dizaine d'excursions documentées. La calibration de ces enregistrements avec des valeurs absolues disponibles dans la littérature permet la quantification des moments dipolaires
Among the methods for reconstructing the geomagnetic field history, studying the variations in cosmogenic isotopes production in the atmosphere has recently developed. At multi millennial scales, this production is mainly modulated by the geomagnetic field intensity. Its record in terrestrial archives provides an independent reading to complement paleomagnetic methods. This work aims at tracing the changes in 10Be production rates recorded in marine sediments, in order to reproduce the geomagnetic variations for the past 800,000 years. Authigenic 10Be/9Be ratios measured using Accelerator Mass Spectrometry along three sequences from different latitudes, characterize the 10Be global production during two time intervals. (1) During the dipole moment low associated with the Laschamp excursion (~ 41,000 years BP), the 10Be overproduction at 38°N and 2°S, confirmed by measurements of 10Be/230Thxs, is identical to that recorded in the Greenland ice sheet. (2) Studying a core collected near the equator and covering the interval 800,000 – 250,000 years BP (Brunhes epoch) reveals the successive phases of global 10Be overproductions triggered by dipole moment lows associated to the Brunhes-Matuyama reversal and also to several other documented excursions. Calibrating these records with absolute values available in the literature allows quantifying dipole moments. These are then compared to paleomagnetic reference reconstructions over the same time series. Bearing out the number and extent of these dipole field lows allows considering to refine their chronology before using their features to get a better understanding of the geodynamo rhythms throughout the last Million years
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Turton, Ian. « Temporal and spatial variations of the geomagnetic field, up to a timescale of 10⁵ years ». Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/11472.

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This thesis comprises two parts. The main part is involved with laboratory studies of the palaeosecular variation of the geomagnetic field as recorded in lake sediments. The natural remanent magnetization of the sediments cored from the two Italian maar lakes, Lago di Monticchio and Lago di Martignano, has been studied. Further studies were carried out on the sediments of Lago di Martignano to determine the cause of large variations in the magnetic intensity of the sediments with an age of ˜ 6000 years BP and it was concluded that this was caused by the arrival of Neolithic man and the advent of agriculture in the catchment area. The directional record for this lake was also compared to the established record for north west Europe. Several declination and inclination features could be correlated between the two records. The record from Lago di Martignano can be accepted as a regional palaeomagnetic reference curve for central Italy. Cores up to 50m long were taken from Lago di Monticchio. Whilst not yet firmly dated, it is agreed that this record spans the last 250,000 years. A relative palaeointensity record has been calculated and spectral analysis has been carried out. It is concluded provisionally that the palaeointensity recorded in the sediments was effected by the astronomical frequencies associated with precession of the earth, the eccentricity and the obliquity of the Earth's orbit. The second part of this thesis is concerned with modelling the palaeosecular variations as recorded in sediments around the world through the Holocene, i.e. the last 10,000 years. The properties of sequential secular variation records from sediments are compared with palaeosecular variation scatter determined from sets of lava flows. It is concluded that a comparison between PSV recorded in lava flows and lake sediments is valid.
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Nakano, Shinya. « Variations of large-scale field-aligned currents and their effects on mid-latitude geomagnetic disturbances ». 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147822.

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Saturnino, Diana. « Une méthode d’observatoires virtuels pour décrire les variations temporelles du champ géomagnétique et applications aux mesures de la mission Swarm ». Nantes, 2015. https://archive.bu.univ-nantes.fr/pollux/show/show?id=181308db-f221-4fd6-84dc-ccfc2af8e6cd.

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A description of the temporal variations of the main geomagnetic field (i. E. , the secular variation, or SV) is crucial to the understanding of core dynamo generation. It is known with high accuracy at observatory locations, which are globally unevenly located, hampering the determination of a global pattern of these variations. Satellites have allowed global surveys of the field and its SV. Their data has been used by global spherical harmonic models using data selection criteria to reduce external contributions. SV small spatial scales may not be well described by these models, and can show significant errors compared to ground measurements. This study attempts to extract temporal variation time series from satellite measurements as it is done at observatory locations. We follow a Virtual Observatories (VO) approach, defining a global mesh of VOs at satellite altitude. We apply an Equivalent Source Dipole (ESD) technique. For each VO and a given time interval all measurements are reduced to a unique location, leading to time series similar to those available at the ground. Synthetic data is first used to validate the approach. We then apply our scheme to Swarm mission measurements. We locally compare the VO-ESD derived time series to ground observations and to satellite-based model predictions. The approach is able to describe field's time variations at local scales. The global mesh of VO time series is used to derive global spherical harmonic models. For a simple parametrization the model well describes the trend of the magnetic field both at satellite altitude and at the surface. Nevertheless more complex modelling can be made to properly profit of VO-ESD time series
La description des variations temporelles du champ géomagnétique (variation séculaire ou SV) est cruciale pour la compréhension de la dynamo. La SV est connue avec une grande précision dans les observatoires magnétiques, qui ont une répartition spatiale inégale. Les satellites donnent des observations globales du champ et de sa SV. Leurs données sont utilisées par les modèles globaux en harmoniques sphériques. Les petites échelles spatiales de la SV décrites par ces modèles peuvent montrer des erreurs par rapport aux mesures des observatoires. Dans cette étude je tente d'extraire des séries temporelles avec des mesures satellitaires comme dans les observatoires. L'approche des observatoires virtuels (VO) est suivie. Un maillage global de volumes à l'altitude du satellite est défini. Pour cela, la technique des Equivalent Source Dipoles (ESD) est appliquée. Pour chaque VO et intervalle de temps donné, toutes les mesures sont réduites à un endroit unique, menant à des séries temporelles similaires à celles disponibles dans les observatoires à la surface. L’approche est validée avec des donnes synthétiques et puis appliquée aux mesures de la mission Swarm. Les séries temporelles VO-ESD sont comparées à celles à la surface et aux prédictions par un modèle. L'approche décrit correctement les variations temporelles du champ à l'échelle locale. Un maillage global de VO est construit et utilisé pour obtenir des modèles globaux. Les modèles sont capables de décrire l'évolution du champ magnétique à la fois à l'altitude du satellite et à la surface. Toutefois des modélisations plus complexes pourront être faites pour profiter des séries temporelles VO-ESD
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Ingham, Elizabeth Mary. « Exploring geomagnetic field behaviour during polarity reversals and excursions ». Phd thesis, 2015. http://hdl.handle.net/1885/156161.

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The Earth's magnetic field, which is driven by dynamo action within the molten outer core, is constantly changing. Variations occur over a wide range of both spatial and temporal scales, and contribute to a complex overall field morphology. Despite significant advances over the last 25 years, much remains unknown regarding the behaviour and driving mechanisms of the geomagnetic field, with increased understanding requiring collection of further high-quality paleomagnetic records and development of new analytical tools. Two significant areas of study are investigated in this thesis: geomagnetic field behaviour during polarity excursions, and whether there is evidence for a link between geomagnetic field intensity and the frequency of polarity reversals. Geomagnetic excursions are short-lived deviations of the geomagnetic field from the normal range of secular variation. Records of the Mono Lake (32 ka) and Laschamp (41 ka) excursions from three marine sediment cores from Bounty Trough, New Zealand, are presented, alongside a complementary record of the Laschamp excursion from fourteen lavas flows from Mt Ruapehu, New Zealand. Recovery of records of both excursions from New Zealand fills a significant gap in the global database of excursion records, and helps to confirm that these geomagnetic excursions were global in scale. Records of the Laschamp excursion obtained in this study suggest that the excursion consisted of two phases of transitional behaviour, centred at around 43 and 41 ka. The age of the later phase agrees with the currently accepted age of the Laschamp excursion of 41.0 ka. It is proposed that the initial phase of the Laschamp excursion was non-dipole dominated, which might explain why it is not as well recorded at previously studied locations as the main, later, phase. Overall, this study provides rare excursion records from the southern hemisphere, which provide an improved view of geomagnetic field morphology during excursions. In this research, a new tool for objectively analysing paleomagnetic time series is employed to investigate the possibility of a link between reversal frequency and paleointensity. Transdimensional Markov chain Monte Carlo techniques are applied to a quality-filtered version of the global paleointensity (PINT) database for the last 202 My to model long-term paleointensity behaviour. The resulting paleointensity model confirms published conclusions that the single silicate crystal method gives significantly different results from more conventional whole rock paleointensity methods. When the much larger whole rock dataset is considered, the resultant paleointensity model is consistent with a stable paleointensity for the last 202 My within the 95% confidence interval about the mean model. Statistical tests indicate no significant correlation between reversal frequency and field intensity at the 0.05 level. However, this result is likely due to the characteristics of the PINT database rather than being a genuine, physically representative conclusion. Given the paucity of data and the general state of the PINT database, concerted efforts to increase the number of high-quality, well-dated paleointensity data are required before conclusions about any link between geomagnetic field intensity and reversal frequency can be confidently drawn.
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Venuti, A. « Variability of the climatic antarctic system during the Plio-Pleistocene : Paleomagnetism contribution ». Thesis, 2007. http://hdl.handle.net/2122/3803.

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In the framework of a gradual global warming, which is one of the topic of major interest in the recent years and which importance is resumed in the Intergovernmental Panel on Climate Change (IPCC), it is important the study of the variability of the Earth’s system at the high latitudes i.e., in Artic and Antarctic areas, because these are the regions more sensitive to climatic changes. The possibility to study marine sedimentary sequences from Antarctica thus represented an important opportunity to investigate such climatic variability. Cold water mass formation in the Southern Ocean is involved in the global thermohaline circulation (THC) through the convection and inter-ocean exchanges of surface, intermediate and bottom waters. This work focus on the study of marine sequences cores from mid-high latitudes from strategic locations far and near the continental margin of Antarctica: (1) ANTA 95-157 (62°05.95'S) and ANTA 96-16 (66°20.09'S) cores are a long transect from New Zealand and Ross Sea slightly south of the present day Polar Front and the Pacific Antarctic Ridge, respectively; (2) MD97-2114 (42°22.32'S) core is on the northern side of Chatham Rise, east of New Zealand; (3) ODP Site 1166 (67°41.77'S) and 1167 (66°24.01'S) are in Prydz Bay continental shelf and slope, respectively. It has been provided a detailed magnetostratigraphy of the sequences and have been investigated magnetic proxies, which reflect variations in mineralogy, grain-size, and concentration of the magnetic fraction. Environmental magnetic data, along with the chronology derived by the magnetostratigraphy, provided an important contribution to our understanding of environmental and climate changes during the time intervals here examined. The cores ANTA and MD97-2114 span the shift from predominant 41-ka to predominant 100-ka glaciation cycles at around 1.0–0.9 Ma, (the Mid-Pleistocene Climate Transition (MPT)) that was centered at 922±12 ka and lasted about 40±9 ka. The amplitude of the 100-ka cycle abruptly increased much later on, at 641±9 ka. The transition was accompanied by an increase in 18O and decrease in 13C but the causes may be many and further information about changes in global ice volume during this period needed. In this core it has been found evidence of orbital influence on sedimentary processes. The core MD97-2114 records long-term variation of the upper Circumpolar Deep Water component of the Deep Western Boundary Current and manifests a stepwise modification of the THC during the transition. ODP Site 1166 and 1167 provide a record of the process involved in the story of the glacial expansion and retreat of the ice at the margin of the continent in Prydz Bay during the Plio-Pleistocene. Preliminary results from SEDANO cores shows downcore variations in concentration, mineralogy, and grain-size of magnetic minerals. In particular, there is a relative increase of moderate coercivity respect to low-coercivity minerals (magnetite) during glacials and a millennial scale variability of the magnetic grain size characterizes the last glacial (core SED 12 and 13) and it may be related to changes in the bottom current velocity.
INGV
Unpublished
2.2. Laboratorio di paleomagnetismo
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Livres sur le sujet "Geomagnetic field variations and reversals"

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Karl-Heinz, Glassmeier, Soffel H. Chr et Negendank Jörg F. W, dir. Geomagnetic field variations. Berlin : Springer, 2009.

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Karl-Heinz, Glassmeier, Soffel H. Chr et Negendank Jörg F. W, dir. Geomagnetic field variations. Berlin : Springer, 2009.

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Karl-Heinz, Glassmeier, Soffel H. Chr et Negendank Jörg F. W, dir. Geomagnetic field variations. Berlin : Springer, 2009.

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Glaβmeier, Karl-Heinz, Heinrich Soffel et Jörg F. W. Negendank. Geomagnetic Field Variations. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-76939-2.

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Geomagnitnoe pole vo vremi͡a︡ inversiĭ v pozdnem kaĭnozoe. Moskva : "Nauka", 1988.

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Geomagnetic field variations. Berlin : Springer, 2009.

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Negendank, Jörg, Heinrich Soffel et K. H. Glaßmeier. Geomagnetic Field Variations. Springer, 2008.

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Negendank, Jorg, Heinrich Soffel et K. H. Glaßmeier. Geomagnetic Field Variations. Springer, 2010.

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Glaßmeier, K. H., Jorg Negendank et Heinrich Soffel. Geomagnetic Field Variations. Springer, 2009.

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M, Gorodnit͡s︡kiĭ A., dir. Anomalous magnetic field of the World Ocean. Boca Raton : CRC Press, 1995.

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Chapitres de livres sur le sujet "Geomagnetic field variations and reversals"

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Wicht, Johannes, Stephan Stellmach et Helmut Harder. « Numerical Models of the Geodynamo : From Fundamental Cartesian Models to 3D Simulations of Field Reversals ». Dans Geomagnetic Field Variations, 107–58. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-76939-2_4.

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Laj, Carlo. « Geomagnetic Field, Polarity Reversals ». Dans Encyclopedia of Solid Earth Geophysics, 1–8. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10475-7_116-1.

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Laj, Carlo. « Geomagnetic Field, Polarity Reversals ». Dans Encyclopedia of Solid Earth Geophysics, 386–93. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8702-7_116.

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Laj, Carlo. « Geomagnetic Field, Polarity Reversals ». Dans Encyclopedia of Solid Earth Geophysics, 507–14. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_116.

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Fabian, Karl, et Roman Leonhardt. « Records of Paleomagnetic Field Variations ». Dans Geomagnetic Field Variations, 65–106. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-76939-2_3.

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Vogt, Joachim, Miriam Sinnhuber et May-Britt Kallenrode. « Effects of Geomagnetic Variations on System Earth ». Dans Geomagnetic Field Variations, 159–208. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-76939-2_5.

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Mazaud, A., C. Laj et E. Bard. « A Phenomenological Model for Reversals of the Geomagnetic Field ». Dans Geomagnetism and Palaeomagnetism, 205–14. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0905-2_14.

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Mohan, N. L., N. Sundararajan et V. V. Haragopal. « Study of Geomagnetic Field Reversals using the Mellin Transform ». Dans Geophysical Data Inversion Methods and Applications, 315–26. Wiesbaden : Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-89416-8_20.

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Valet, Jean-Pierre, et Emilio Herrero-Bervera. « A Few Characteristic Features of the Geomagnetic Field During Reversals ». Dans The Earth's Magnetic Interior, 139–51. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0323-0_10.

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Tarling, D. H. « Secular Variations of the Geomagnetic Field — The Archaeomagnetic Record ». Dans Secular Solar and Geomagnetic Variations in the Last 10,000 Years, 349–65. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3011-7_22.

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Actes de conférences sur le sujet "Geomagnetic field variations and reversals"

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Kaji, Chinmaya V., Randy C. Hoover et Shankarachary Ragi. « Underwater Navigation using Geomagnetic Field Variations ». Dans 2019 IEEE International Conference on Electro Information Technology (EIT). IEEE, 2019. http://dx.doi.org/10.1109/eit.2019.8834192.

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Kühn, G. J., et L. Loubser. « External Geomagnetic Field Variations And Magnetic Surveys ». Dans 1st SAGA Biennial Conference and Exhibition. European Association of Geoscientists & Engineers, 1989. http://dx.doi.org/10.3997/2214-4609-pdb.222.029.

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Freire, L., S. R. Laranja et L. Benyosef. « Geomagnetic Field Variations in the Equatorial Electrojet Sector ». Dans Simpósio Brasileiro de Geofísica. Sociedade Brasileira de Geofísica, 2016. http://dx.doi.org/10.22564/7simbgf2016.041.

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Delipetrov, Todor. « GEOMAGNETIC FIELD AND SECULAR VARIATIONS OF THE ASTRONOMICAL PARAMETARS ». Dans 13th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING. Stef92 Technology, 2013. http://dx.doi.org/10.5593/sgem2013/ba1.v2/s05.010.

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Sivokon, V. P., N. V. Cherneva, S. Y. Khomutov et A. S. Serovetnikov. « Active experiments in the ionosphere and geomagnetic field variations ». Dans 20th International Symposium on Atmospheric and Ocean Optics : Atmospheric Physics, sous la direction de Oleg A. Romanovskii. SPIE, 2014. http://dx.doi.org/10.1117/12.2074512.

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Clem, John. « South Pole Neutron Monitor Sensitivity to Geomagnetic Field Variations ». Dans The 34th International Cosmic Ray Conference. Trieste, Italy : Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.236.0143.

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Mandrikova, Oksana, et Anastasia Rodomanskay. « Method for detecting geomagnetic disturbances based on the wavelet model of geomagnetic field variations ». Dans 2021 International Conference on Information Technology and Nanotechnology (ITNT). IEEE, 2021. http://dx.doi.org/10.1109/itnt52450.2021.9649062.

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Koryakin, Dmitry. « Correction of Geomagnetic Field Variations in Marine Magnetic Surveys Using Observatory and Model Geomagnetic Data ». Dans II PAN AMERICAN WORKSHOP ON GEOMAGNETISM – II PANGEO. Recife, Brazil : Even3, 2018. http://dx.doi.org/10.29327/2pangeo.a5.

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Chamati, M., et B. Andonov. « Effects of a Strong Thunderstorm on the ULF Geomagnetic Field Variations ». Dans 11th Congress of the Balkan Geophysical Society. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202149bgs5.

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Malamanov, Stepan, Valery Pavlovsky et Denis Khitrykh. « Numerical simulation of variations in the geomagnetic field of the earth ». Dans 2014 20th International Workshop on Beam Dynamics and Optimization (BDO). IEEE, 2014. http://dx.doi.org/10.1109/bdo.2014.6890053.

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Rapports d'organisations sur le sujet "Geomagnetic field variations and reversals"

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Nikitina, L., et L. Trichtchenko. Extreme values statistical assessment for geomagnetic and geoelectric field variations for Alberta. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296956.

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Kleimenova, Natalia G., A. Odzimek, S. Michnowski et M. Kubicki. Geomagnetic Storms and Substorms as Space Weather I nfluence on Atmospheric Electric Field Variations. Balkan, Black Sea and Caspian Sea Regional Network on Space Weather Studies, novembre 2018. http://dx.doi.org/10.31401/sungeo.2018.01.14.

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