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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Geomagnetic field behavior before and after the Kauai reverse-normal polarity transition
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Geomagnetic field behavior before and after the Kauai reverse-normal polarity transition

机译：考艾岛反正极性转换之前和之后的地磁场行为

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New paleomagnetic results from 4 m.y. old lava flows from Kauai, Hawaii, suggest that strong poloidal field is associated with an unusual state of the geodynamo that follows attempts at polarity reversal (successful or not). The new data comprise 50 paleomagnetic sites from superposed lava flows occurring just below and above the Kauai reverse-normal polarity transition. A composite record of 45 distinct field determinations was constructed by combining sites that record similar ancient field and correlating them to previously published results from Kauai. Of the 45 data, 25 include paleointensity estimates derived from double-heating experiments. A comparison of the composite record from Kauai with two similar data sets from volcanic sequences shows that field variability tin direction, intensity, or both) can change substantially across a polarity transition. These changes, however, do not appear to be systematic in sign or magnitude. The only feature common to all three records is high field strength in the posttransitional interval, interpreted here as a transient phenomenon associated with the reversal process. [References: 39]
机译：从4 m.y开始产生新的古磁性。来自夏威夷考艾岛的古老熔岩流表明，强烈的极向电场与大地发电机的异常状态相关，该状态发生在极性反转尝试（成功与否）之后。新的数据包括刚好在考艾岛反向法向极性转换的上方和下方出现的来自叠加熔岩流的50个古磁性位点。通过组合记录相似古代田地的地点并将它们与考艾岛先前发布的结果相关联，构建了45个不同田间测定的综合记录。在45项数据中，有25项包括从两次加热实验得出的古强度估计值。来自考艾岛的合成记录与来自火山序列的两个类似数据集的比较表明，场变化性锡方向，强度或两者都可以在整个极性跃迁上发生很大变化。但是，这些变化在符号或大小上似乎不是系统的。所有这三个记录的唯一共同特征是过渡后间隔中的高场强，此处解释为与反转过程相关的瞬态现象。 [参考：39]

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