Abstract Variations of the geomagnetic field during the past millennia can be obtained by investigating archeological material. The spatial distribution of the available data across Europe is rather uneven and only about 15% of the sites provide a full vector record of the geomagnetic field. Here we report 39 new reliable paleointensity data for sites from Austria, Germany and Switzerland, with ages ranging between 1500 BCE and 1900 CE. For 31 of them, directional information is available, too. Paleointensities were determined with Thellier type techniques, with the multiple-specimen domain-state corrected paleointensity protocol or with both techniques. Corrections for anisotropy of thermoremanent magnetization were carried out for the structures, showing small variations of only a few per cent in most cases. Cooling rate dependence was tested for 16 structures. Often strong alteration during the experiments was observed. Seven successful cooling rate corrections were applied, which lowered the paleointensity values by about 10%. Values obtained from the multiple-specimen technique are generally somewhat lower than those from the Thellier experiments. Rock magnetic measurements revealed magnetite-type minerals mostly in pseudo single domain range as main magnetic carrier, but also high coercive mineral components like hematite or epsilon iron oxide are present. The new data are mostly in good agreement with published paleointensities. They support the presence of strong intensity variations around 800 CE and in the millennium BCE. The new full vector data reveal that the deep paleointensity minimum observed from German data around 850 BCE is accompanied by large variations in direction with declinations up to 50°.

中文翻译：

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来自中欧的新古地磁长期变化数据，II：强度

摘要 过去几千年来地磁场的变化可以通过调查考古材料获得。整个欧洲可用数据的空间分布相当不均匀，只有大约 15% 的站点提供地磁场的完整矢量记录。在这里，我们报告了来自奥地利、德国和瑞士的地点的 39 个新的可靠古强度数据，年龄范围在公元前 1500 年到公元 1900 年之间。其中 31 个也提供了方向信息。古强度是用 Thellier 类型技术、多样本域状态校正古强度协议或两种技术确定的。对这些结构进行了热剩磁化各向异性的校正，在大多数情况下显示出只有几个百分点的微小变化。测试了 16 种结构的冷却速率依赖性。在实验过程中经常观察到强烈的变化。应用了七次成功的冷却速率校正，使古强度值降低了约 10%。从多样本技术获得的值通常比从 Thellier 实验获得的值略低。岩石磁性测量显示，磁铁矿型矿物主要以伪单畴范围作为主要磁性载体，但也存在高矫顽力矿物成分，如赤铁矿或ε铁氧化物。新数据大多与公布的古强度一致。它们支持在公元 800 年和公元前千年左右存在强烈的强度变化。