Long-term seafloor geomagnetic station in the northwest Pacific: A possible candidate for a seafloor geomagnetic observatory
Long-term seafloor geomagnetic station in the northwest Pacific: A possible candidate for a seafloor geomagnetic observatory
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DOI：
10.1186/bf03351970
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发表时间：
2006-01-01
影响因子：
3
通讯作者：
Ichiki, M.
中科院分区：
文献类型：
--
作者：
Toh, H.;Hamano, Y.;Ichiki, M.
两年来，在西北太平洋的海底测量了地磁变化。海底数据包括由三分量磁通门磁力仪测量的地磁矢量场和由Overhauser(1953)磁力仪测量的绝对标量总力以及方位和倾角的姿态测量。利用姿态数据，将西北太平洋(北纬41°06‘08’，东经159°57‘47’，-5580英寸)的地磁数据转换为与陆地和卫星测量相同的参考系。用Hamano(2002)的全球时间域分析方法检验了转换后的矢量数据的短周期变化，这表明海底地磁观测数据与现有的陆地观测网络是兼容的。地球主场的平稳和渐进变化(即地磁长期变化)也与最新的国际地磁参考场(IGRF-10；IAGA，2005)和Orsted卫星(Olsen，2002)对标量场和矢量场的预测一致。这意味着现在可以在海底观测地磁矢量的长期变化。
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.