中国境内各阶非偶极子磁场的时空变化

冯彦; 孙涵; 蒋勇; 毛飞

doi:10.3969/j.issn.0253-3782.2014.04.012

中国境内各阶非偶极子磁场的时空变化

冯彦^1, ,,
孙涵²,
蒋勇¹,
毛飞³

1.
中国南京 210044 南京信息工程大学数学与统计学院
2.
中国南宁 530022 国家卫星气象中心遥感应用试验基地/广西气象减灾研究所
3.
中国北京 100081 中国气象科学研究院

基金项目: 国家自然科学基金(41174165)、公益性行业(气象)科研专项(GYHY201306073)和南京信息工程大学科研启动项目(20110420)共同资助.

详细信息

通讯作者:
冯彦, E-mail:fengyan1980@gmail.com

中图分类号: P318.1⁺1
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出版历程
- 收稿日期: 2013-07-18
- 修回日期: 2014-01-20
- 发布日期: 2014-06-30

Spatio-temporal variation of non-dipole magnetic fields with different degree in China

1.
College of Mathematics and Statistics, Nanjing University of Information and Technology, Nanjing 210044, China
2.
Remote Sensing Application and Experiment Station of National Satellite Meteorological Center/Guangxi Meteorological Disaster Mitigation Institute, Nanning 530022, China
3.
Chinese Academy of Meteorological Sciences, Beijing 100081, China

摘要

摘要: 为了研究中国境内各阶非偶极子(ND)磁场，通过最新的地磁场模型CALS10K.1b计算了10000 BC—AD 1990年ND磁场在中国境内的时空及能量变化；2²，2³和2⁴极子磁场零值线主要呈现出从我国中北部向东南部移动，从北部向东部移动，以及从东南部向西北部移动的趋势；除了2⁶极子磁场，其余ND磁场在1500年以后均有“翘尾”现象，其所占主磁场的比值在10000 BC—AD 1500年呈震荡变化，从1500年开始快速上升；除了2²极子磁场，其它各阶ND磁场能量随时间变化的趋势基本一致. 在5650 BC年左右，各阶ND磁场能量值均出现高值并随阶数的增大而衰减，反映了在该时间点通过地核发电机产生的磁场能量随径向距离而近似线性衰减，地磁场能量主要源自地球液态外核. 将CALS10K.1b模型结果与IGRF11模型对比后，得出CALS10K.1b模型所计算的ND磁场及能量值较为可靠，而两者差异主要源于数据和建模方法的不同.
- 非偶极磁场 /
- 时空变化 /
- CALS10K.1b /
- IGRF11
Abstract: In order to systematically study all non-dipole (ND) magnetic fields (truncation level N=2—10) in China, we studied the spatio-temporal variation of ND magnetic fields with different degree and their energies during the period of 10000 BC—1990 AD based on the newest time-based global model CALS10K.1b. The latest version of IGRF, i.e., IGRF11, was also adopted to compare and verify. Results show that the zero lines of 2², 2³ and 2⁴ pole fields mainly moved from middle-northern region to southeastern region of China, from northern to eastern China, and moved from southeastern to northwestern region of China. Except the 2⁶ pole field, all ND fields exhibited “tail raise”. The percentage of ND field accounting for main field oscillated during 10000 BC—1500 AD, and then rapidly increased. The energies of all ND fields changed following almost same trend except the 2² pole field. Around the year 5650 BC, the energy reached high value, and then attenuated with the degree increasing, which indicates that the energy resulting from the Earth core’s dynamo attenuates linearly alone with radial distance. The energy of geomagnetic field mainly originates from the Earth’s fluid outer core. Comparison of the result based on CALS10K.1b with that from IGRF11 showed that CALS10K.1b’s results in this study are more reliable, and their differences mainly result from different data used and modeling methods.
- non-dipole magnetic field /
- spatio-temporal variation /
- CALS10K.1b /
- IGRF11

HTML全文

图 1 2²极子磁场零值线不同时期的空间分布图图中带箭头线段表示磁场零值的趋势线

Figure 1. Spatial distribution of zero lines of 2² pole magnetic field in different epochs where the lines with arrow show the variation tendency of zero lines

下载: 全尺寸图片幻灯片

图 2 2³极子磁场零值线不同时期空间分布图

Figure 2. Spatial distribution of zero lines of 2³ pole magnetic field in different epochs

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图 3 2⁴极子磁场零值线不同时期空间分布图

Figure 3. Spatial distribution of zero lines of 2⁴ pole magnetic field in different epochs

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图 4 2^N(N=2，3，…，10)极子磁场强度平均值随时间的变化

Figure 4. The variation of mean intensitiies of 2^N(N=2，3，…，10)pole magnetic field with time

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图 5 2^N(N=2，3，…，10)极子磁场占主磁场强度百分比随时间的变化

Figure 5. Variation of mean intensity percentage of 2^N(N=2，3，…，10)pole fields to main field time

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图 6 两种模型的2^N(N=2，3，…，10)极子磁场强度在1900—1990年随时间变化图

Figure 6. Intensity variations of 2^N(N=2，3，…，10)pole magnetic fields with time based on the models CALS10K. 1b and IGRF11 during 1900—1990

下载: 全尺寸图片幻灯片

图 7 2^N(N=2，3，…，10)非偶极子磁场能量E随时间的变化

Figure 7. Energy(E)variations of 2^N(N=2，3，…，10)non-pole magnetic fields with time

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图 8 10000 BC—AD 1990年2^N(N=2，3，…，10)非偶极子磁场的平均能量E随阶数N的变化

Figure 8. Variation of mean energies of 2^N(N=2,3,…,10) pole magnetic fields during 10000 BC-AD 1990

下载: 全尺寸图片幻灯片

图 9 IGRF11模型与CALS10K. 1b模型下2²和2³极子磁场在1900—1990年的能量变化

Figure 9. Variation of energies of 2² and 2³ pole fields based on the models IGRF11 and CALS10K.1b during the period of 1900-1990

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表 1 2^N(N=2，3，…，10)极子磁场所占主磁场的平均百分比值

Table 1 Mean percentage of 2^N(N=2，3，…，10)pole fields accounting for main field

下载: 导出CSV

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