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首页> 外文期刊>Earth, planets and space: EPS >Long-term seafloor geomagnetic station in the northwest Pacific: A possible candidate for a seafloor geomagnetic observatory
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Long-term seafloor geomagnetic station in the northwest Pacific: A possible candidate for a seafloor geomagnetic observatory

机译：西北太平洋的长期海底地磁站：海底地磁观测站的可能候选者

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摘要

For two years, geomagnetic variations have been measured at the seafloor in the northwest Pacific. The seafloor data consist of the geomagnetic vector field measured by a three-component fluxgate magnetometer and the absolute scalar total force measured by an Overhauser (1953) magnetometer with attitude measurements for both orientation and tilt. Using the attitude data, the geornagnetic data at a site in the northwest Pacific (41 degrees 06'08 '' N, 159 degrees 57'47 '' E, -5580 in), hereafter referred to as NWP, were converted into the same reference frame as land and satellite measurements. Short-period variations of the converted vector data were examined by Hamano's (2002) global time domain analysis melhod, which showed compatibility of the seafloor geomagnetic observatory data with the existing land observatory network. The smooth and gradual change of the Earth's main field (i.e., the geomagnetic secular variation) was also found consistent with those predicted by the latest International Geomagnetic Reference Field (IGRF-10; IAGA, 2005) and by Orsted Satellite (Olsen, 2002) for not only the scalar field but also the vector field. This means that observation of the geomagnetic vector secular variation is now feasible on the seafloor.
机译：两年来，一直在西北太平洋海底测量地磁变化。海底数据包括由三分量磁通门磁力计测量的地磁矢量场和由Overhauser（1953）磁力计测量的绝对标量总力，以及方位和倾斜度的姿态测量值。使用姿态数据，将西北太平洋某地点（北纬41度06'08，东经159度57'47”，-5580英寸）中的地磁数据转换为相同的数据参考框架作为陆地和卫星测量。 Hamano（2002）的全球时域分析方法检查了转换后的矢量数据的短期变化，该方法显示了海底地磁观测数据与现有陆地观测网络的兼容性。还发现地球主场的平稳且逐渐变化（即地磁长期变化）与最新的国际地磁参考场（IGRF-10; IAGA，2005）和奥斯特德卫星公司（Olsen，2002）所预测的一致。不仅适用于标量场，而且适用于向量场。这意味着在海底观测地磁矢量的长期变化现在是可行的。

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