On the use of archeology in geomagnetism, and vice-versa: Recent developments in archeomagnetism

Gallet, Yves; Genevey, Agnès; Goff, Maxime Le; Warmé, Nicolas; Gran-Aymerich, Jean; Lefèvre, Annie

doi:10.1016/j.crhy.2009.08.005

Cited by 55 publications

(51 citation statements)

References 92 publications

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“…Longer time-series of observations are necessary. We note also that well-established long-time data sets from different parts of the world are essential to develop archeometry (Gallet et al, 2009) and data assimilation (Fournier et al, 2010) better constrain of the role of the geomagnetic field on the cosmogenic isotopes production rate (e.g., Lifton et al, 2008;Usoskin et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Archeointensities in Greece during the Neolithic period: New insights into material selection and secular variation curve

Fanjat

Aidona

Kondopoulou

et al. 2013

Physics of the Earth and Planetary Interiors

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Section: Introductionmentioning

confidence: 99%

Archeointensities in Greece during the Neolithic period: New insights into material selection and secular variation curve

Fanjat

Aidona

Kondopoulou

et al. 2013

Physics of the Earth and Planetary Interiors

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“…Here we used the GEOMAGIA50.v3 database (Donadini et al 2006;Korhonen et al 2008;Brown et al 2015) to which we added recent archeo-and paleointensity results (Cai et al 2014(Cai et al , 2015Cromwell et al 2015;de Groot et al 2015;Di Chiara et al 2014;Gallet et al 2008Gallet et al , 2009Gallet & Al Maqdissi 2010;Hong et al 2013;Kapper et al 2015;Kissel et al 2015;Osete et al 2015;Shaar et al 2015;Stillinger et al 2015). Concerning the data compiled in this version of GEOMAGIA, the Mesopotamian data from Nachasova & Burakov (1995 were modified according to .…”

Section: Appendix A: Gmag9k Axial Dipole Evolutionmentioning

confidence: 99%

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Usoskin

Gallet

Lopes

et al. 2016

A&A

136

183

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Aims. Cosmogenic isotopes provide the only quantitative proxy for analyzing the long-term solar variability over a centennial timescale. While essential progress has been achieved in both measurements and modeling of the cosmogenic proxy, uncertainties still remain in the determination of the geomagnetic dipole moment evolution. Here we aim at improving the reconstruction of solar activity over the past nine millennia using a multi-proxy approach. Methods. We used records of the 14 C and 10 Be cosmogenic isotopes, current numerical models of the isotope production and transport in Earth's atmosphere, and available geomagnetic field reconstructions, including a new reconstruction relying on an updated archeo-and paleointensity database. The obtained series were analyzed using the singular spectrum analysis (SSA) method to study the millennial-scale trends. Results. A new reconstruction of the geomagnetic dipole field moment, referred to as GMAG.9k, is built for the last nine millennia. New reconstructions of solar activity covering the last nine millennia, quantified in terms of sunspot numbers, are presented and analyzed. A conservative list of grand minima and maxima is also provided. Conclusions. The primary components of the reconstructed solar activity, as determined using the SSA method, are different for the series that are based on 14 C and 10 Be. This shows that these primary components can only be ascribed to long-term changes in the terrestrial system and not to the Sun. These components have therefore been removed from the reconstructed series. In contrast, the secondary SSA components of the reconstructed solar activity are found to be dominated by a common ≈2400-year quasi-periodicity, the so-called Hallstatt cycle, in both the 14 C and 10 Be based series. This Hallstatt cycle thus appears to be related to solar activity. Finally, we show that the grand minima and maxima occurred intermittently over the studied period, with clustering near lows and highs of the Hallstatt cycle, respectively.

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“…Only 48 archaeointensities from western Europe and nearby countries pass this selection criterion. The selection includes data from France (N ¼26, Chauvin et al, 2000;Gallet et al, 2009a;Genevey and Gallet, 2002;Genevey et al, 2009), Spain (N ¼ 18, Catanzariti et al, 2012Gó mez-Paccard et al, 2006c, 2008, Switzerland (N ¼1, Donadini et al, 2008;Kovacheva et al, 2009a), Belgium (N ¼2, Genevey et al, 2009;Spassov et al, 2008) and northern Morocco (N ¼1, Gó mez-Paccard et al, 2012). All data have been relocated to the latitude of Paris through the VADM (Fig.…”

Section: Geomagnetic Field Intensity Changes In Western Europe Betweementioning

confidence: 99%

“…Available western European data indicate that during the past 2500 yr there have been periods of rapid intensity fluctuations, such as the one observed around 800 AD, interspersed with periods of little change, as seen during Roman times (Chauvin et al, 2000;Gallet et al, 2003Gallet et al, , 2009aGenevey and Gallet, 2002;Genevey et al, 2009;Gó mez-Paccard et al, 2008). The challenge now is to precisely describe these rapid intensity changes and to understand how such behaviour can arise (Gallet et al, 2009b).…”

Section: Introductionmentioning

confidence: 99%

“…The challenge now is to precisely describe these rapid intensity changes and to understand how such behaviour can arise (Gallet et al, 2009b). One of the periods with a strikingly poor data coverage is the period between 500 and 1000 AD for which only six archaeointensities are available for western Europe (Catanzariti et al, 2012;Gallet et al, 2009a;Genevey and Gallet, 2002;Kovacheva et al, 2009a). Based on the available French data an intensity peak around 800 AD followed by a strong decrease of about 30% with associated rate of change as fast as $ 7 mT/century has been previously identified .…”

Section: Introductionmentioning

confidence: 99%

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Improving our knowledge of rapid geomagnetic field intensity changes observed in Europe between 200 and 1400 AD

Gómez‐Paccard

Chauvin

Lanos

et al. 2012

Earth and Planetary Science Letters

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a b s t r a c tAvailable archaeomagnetic data indicate that during the past 2500 yr there have been periods of rapid geomagnetic field intensity fluctuations interspersed with periods of almost constant field strength. Despite Europe being the most widely covered region in terms of archaeomagnetic data the occurrence and the behaviour of these rapid geomagnetic field intensity changes is under discussion and the challenge now is to precisely describe them. The aim of this study is to obtain an improved description of the sharp intensity change that took place in western Europe around 800 AD as well as to investigate if this peak is observed at the continental scale. For this purpose 13 precisely dated early medieval Spanish pottery fragments, four archaeological French kilns and three collections of bricks used for the construction of different French historical buildings with ages ranging between 335 and 1260 AD have been studied. Classical Thellier experiments performed on 164 specimens, and including anisotropy of thermoremanent magnetisation and cooling rate corrections, gave 119 reliable results. The 10 new high-quality mean archaeointensities obtained confirm the existence of an intensity maximum of $ 85 mT (at the latitude of Paris) centred at $ 800 AD and suggest that a previous abrupt intensity change occurred around 600 AD. Together with previously published data from western Europe that we deem to be the most reliable, the new data also suggest the existence of two other abrupt geomagnetic field intensity variations during the 12th century and around the second half of the 13th century AD. High-quality archaeointensities available from eastern Europe indicate that very similar geomagnetic field intensity changes occurred in this region. European data indicate that very rapid intensity changes (of at least 20 mT/century) took place in the recent history of the Earth's magnetic field. The results call for additional high-quality archaeointensities obtained from precisely dated samples and for a selection of the previously published data if a refined description of geomagnetic field intensity changes at regional scales is to be obtained.

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On the use of archeology in geomagnetism, and vice-versa: Recent developments in archeomagnetism

Cited by 55 publications

References 92 publications

Archeointensities in Greece during the Neolithic period: New insights into material selection and secular variation curve

Archeointensities in Greece during the Neolithic period: New insights into material selection and secular variation curve

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Improving our knowledge of rapid geomagnetic field intensity changes observed in Europe between 200 and 1400 AD

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