Decadal and subdecadal secular variation of the main geomagnetic field

主地磁场的年代际和年代际以下长期变化

• 批准号: 5253016
• 负责人: Professor Dr. Volker Haak
• 金额: --
• 依托单位: Department of Earth and Ocean Sciences
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2000
• 资助国家: 德国
• 起止时间: 1999-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5253016?language=en
• 关键词: Decadal; subdecadal; secular; variation; main

We propose to examine the detailed secular variation over the period 1980-2000. This will be achieved by simultaneous modelling of the main field and secular variation using all available data. The time interval is "bookended" by high-quality satellite vector data, from Magsat in 1980, and Orsted/CHAMP in 1999-2000. All available data will be examined for the intervening period, especially secular variation recorded at permanent magnetic observatories and by repeat surveys. Particular attention will be paid to a re-examination of POGS data, with an attempt to extract some vector information from this data. The models derived will be used in various scientific studies including 1) consideration of "geomagnetic jerks", 2) modelling of core-surface flow, and 3) examination of possible time dependence of the lithospheric field. They will also be appropriate for considering the influence of external magnetic fields. The study will be used as a springboard towards submitting candidate models for IGRF 2005, and DGRF 1995 and 2000.

我们建议研究1980-2000年期间的详细长期变化。这将通过使用所有现有数据同时模拟主场和长期变化来实现。时间间隔由高质量的卫星矢量数据组成，分别来自1980年的MAGSAT和1999-2000年的Orsted/CHAMP。将审查所有现有数据，特别是在永磁台记录的长期变化，并通过重复调查。将特别注意重新审查POGS数据，试图从这些数据中提取一些矢量信息。所导出的模型将用于各种科学研究，包括1)考虑“地磁冲击”，2)对岩心-表面流动进行模拟，以及3)研究岩石圈磁场可能的时间依赖性。它们也适用于考虑外部磁场的影响。这项研究将被用作提交2005年国际政府间气候变化框架以及1995年和2000年全球气候变化框架候选模型的跳板。