Decadal and subdecadal secular variation of the Earth`s magnetic field deduced from ground based measurements and multiple satellite measurements

根据地面测量和多个卫星测量推导出地球磁场的年代际和年代际以下长期变化

• 批准号: 5428725
• 负责人: Dr. Monika Korte
• 金额: --
• 依托单位: Sektion 2.3: Geomagnetismus
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5428725?language=en
• 关键词: Decadal; subdecadal; secular; variation; Earth

We propose a detailed study of global geomagnetic secular variation on the decadal to sub-decadal scale. The first step will be an extension of a recent examination of the secular variation of the Earth's magnetic field from 1980 to 2000, which resulted in the description of two so-called geomagnetic jerks, rapid changes of secular variation, in unprecedented detail and led to the detection of other short-period variations of internal origin. Extending the model period to 1960 to 2005 will include several more geomagnetic jerks and confirm the origin of the short-period variations. We further intend to continuously model secular variation based on simultaneous measurements of more than one satellite in orbit, namely Orsted, CHAMP and SAC-C. The models derived as first step of this project will then be used for: 1) modelling of core-surface flow, 2) investigation of the spatio-temporal structure of geomagnetic jerks at the core-mantle boundary, 3) investigation of the distribution and source of short-period secular variation features. As a side-effect, we will be able to submit candidate models for the IGRF 2005 and the DGRF 2005.

我们提出了一个详细的研究全球地磁长期变化的十年到亚十年尺度。第一步将是扩展最近对1980年至2000年地球磁场长期变化的研究，该研究以前所未有的详细程度描述了两次所谓的地磁突变（长期变化的快速变化），并导致了对其他内部起源的短周期变化的检测。将模型的周期延长到1960年至2005年，将包括几个更多的地磁冲击，并确认短周期变化的起源。我们还打算根据对轨道上多颗卫星（即Orsted、CHAMP和SAC-C）的同时测量，连续模拟长期变化。作为本项目的第一步，导出的模型将用于：1）核-地流动的模拟，2）核-幔边界地磁急动的时空结构的研究，3）短周期长期变化特征的分布和来源的研究。作为一个副作用，我们将能够提交IGRF 2005和DGRF 2005的候选模型。