...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Geosciences >Residual Magnetic Anomalies Mapping from CHAMP Observations
【24h】

Residual Magnetic Anomalies Mapping from CHAMP Observations

机译：CHAMP观测值的残留磁异常图

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

CHAMP high-quality vector magnetometer observations collected from July 2000 to September 2010 have been used to map the residual vector magnetic anomaly fields. This field is so called the lithospheric magnetic field which is the result of two contributions of the induced and the remanent magnetization. It is therefore essential to study the magnetic properties of the crustal rocks. Isolating this field from the other contributions, interpreting and even defining are however difficult and still debated. We investigate how to identify and separate the lithospheric vector magnetic field ΔX, ΔY and ΔZ from other contributions. For this purpose we use selected night magnetic data from which we remove a model field of degree 16 and external model field of degree 2 developed by spherical harmonics analysis. Concerning the induced lithospheric field which is assumed to be aligned with the internal dipole was also removed. To minimize the secular variation effects, we calculated internal models for each two months. The method developed here has been successfully applied to isolate lithospheric field produced by remanent magnetizations from CHAMP satellite data. The resolution and altitude measurements make it very hard to map short wavelength crustal magnetic anomalies. The large-scale strong magnetic anomalies detected using this technique are in agreement with previous global magnetic maps. These anomalies appear with an amplitude of about 10 nT at satellite altitude such as Bangui’s anomaly.
机译：从2000年7月至2010年9月收集的CHAMP高质量矢量磁强计观测值已用于绘制残留矢量磁异常场的图。该场称为岩石圈磁场，它是感应磁化和剩余磁化的两个贡献的结果。因此，研究地壳岩石的磁性至关重要。然而，将该领域与其他贡献区分开来，进行解释甚至定义是困难的，并且仍在争论中。我们研究如何识别和分离岩石圈矢量磁场ΔX，ΔY和ΔZ与其他贡献。为此，我们使用选定的夜磁场数据，从中删除通过球谐分析得出的16度模型场和2度外部模型场。关于假定与内部偶极对准的感应岩石圈场也被删除了。为了最小化长期变化的影响，我们每两个月计算一次内部模型。本文开发的方法已成功应用于从CHAMP卫星数据中分离出剩余磁化产生的岩石圈场。分辨率和高度测量使绘制短波长地壳磁异常非常困难。使用此技术检测到的大规模强磁异常与以前的全局磁图一致。这些异常在卫星高度（例如班吉异常）以大约10 nT的幅度出现。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号