基于多台站观测的中国区域地磁指数

王楚钦; 杜丹; 张效信; 赵明现; 蒋勇

doi:10.11728/cjss2015.01.026

基于多台站观测的中国区域地磁指数

doi: 10.11728/cjss2015.01.026

王楚钦^1,2,3,
杜丹²,
张效信²,
赵明现²,
蒋勇¹

1.
南京信息工程大学数学与统计学院南京 210044
2.
国家卫星气象中心北京 100081
3.
云南省气象信息中心昆明 650034

基金项目: 国家高技术研究发展计划项目(2012AA121002),国家重点基础研究发展计划项目(2011CB811406),国家重大科学研究计划项目(2012CB957803)和国家自然科学青年基金项目(41304144)共同资助

详细信息

中图分类号: P353
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出版历程
- 收稿日期: 2014-02-24
- 修回日期: 2014-09-17
- 刊出日期: 2015-01-15

New regional geomagnetic activity index based on multi-station observation

1.
School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing 210044
2.
National Satellite Meteorological Center, Beijing 100081
3.
Meterological Information Center of Yunnan Province, Kunming 650034

摘要

摘要: 利用中国14个地磁台站和全球23个地磁台站的H分量分钟值数据,分析单台站小时幅度指数r_H的时空分布特征,在此基础上结合台站之间r_H指数的相似度度量(残差指数Ra),采用K均值聚类算法将中国14个地磁台站划分为7个区域,根据加权法计算各区域的区域指数Rr.结果表明,r_H指数具有27天太阳自转周变化,季节变化不显著,但仍存在春秋季大而冬夏季小的特征;在空间变化上,r_H随纬度的增高而增大,并且在磁暴期间r_H指数的幅值和形态均表现出明显的经度差异,随地方时呈现晨-昏不对称现象;与Dst指数、SYM-H指数、Kp指数及各区域内台站的H分量观测数据对比分析发现,区域指数Rr能有效反映区域地磁扰动.
- r_H指数 /
- 时空分布 /
- 残差指数 /
- K均值聚类 /
- 区域地磁指数
Abstract: With the data of 14 geomagnetic observatories in China and 23 geomagnetic observatories abroad, both temporal and spatial variation characteristics of r_H index are analyzed. And the 14 geomagnetic observatories in China are divided into 7 regions by using K-means clustering algorithm based on the similarity measurement, and the residual index (Ra) of r_H index between each two observatories. Then the regional r_H index (Rr) of each region is calculated by linear weighted sum method. The results show that r_H has a periodic change in 27 days, which is the solar rotation cycle. Although no significant seasonal variation is found in r_H, it is also shown that the average of r_H in spring and autumn is greater than in summer and winter. For spatial variations, r_H increases with the latitude. There are some obvious difference in amplitude and morphology of r_H during geomagnetic storms, and the feature of dusk-dawn asymmetry is found. Comparison with the observational data of H component and other Global geomagnetic activity indices, such as Dst, SYM-H and Kp, indicate that Rr can reflect the regional geomagnetic disturbance effectively.
- r_H index /
- Temporal and spatial distribution /
- Residual index /
- K-means clustering /
- Regional geomagnetic activity index

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参考文献(23)

[1]	Xu Wenyao. Yesterday, Today and Tomorrow of Geomagnetic Indices[J]. Prog. Geophys., 2009, 24(3):830-841. In Chinese (徐文耀. 地磁指数的过去、现在、未来[J]. 地球物理学进展, 2009, 24(3):830-841)
[2]	Xu Wenyao. Advances on geomagnetic observations and studies in China[J]. Chin. J. Geophys., 1997, 40:217-224. In Chinese (徐文耀. 我国地磁观测研究的发展[J]. 地球物理学报, 1997, 40:217-224)
[3]	Menvielle M. Derivation and dissemination of geomagnetic indices[J]. Rev. Geofis., 1998, 48(27):51-66
[4]	Menvielle M, Papitashvili N, Hakkinen L, et al. Computer production of K indices review and comparison of methods[J]. Geophys. J. Int., 1995, 123:866-886
[5]	Xu W Y. Uncertainty in magnetic activity indices[J]. Sci. China.: Tech. Sci., 2008, 51(10):1659-1664
[6]	Xu W Y, Kamide Y. Decomposition of daily geomagnetic variations by using method of natural orthogonal component[J]. J. Geophys. Res., 2004, 109, A05218,doi:10. 1029/2003JA010216
[7]	Bartels J, Heek N H, Johnston H F. The three-hour-range index measuring geomagnetic activity[J]. Terr. Mag. Atmos. Elec., 1939, 44:411-454
[8]	Sugiura M, Poros D J. Hourly values of equatorial Dst for the IGY[J]. Ann. Int. Geophys. Year., 1964, 35:9-45
[9]	Iyemori T. Storm-time magnetospheric currents inferred from mid-latitude geomagnetic field variations[J]. J. Geophys. Res., 1990, 42:1249-1265
[10]	Gannon J L, Love J J. USGS 1-min Dst index[J]. J. Atmos. Sol. Terr. Phys., 2011, 73:323-334
[11]	Gannon J L. Assessing the validity of station location assumptions made in the calculation of the Geomagnetic Disturbance Index Dst[J]. Space Weather, 2012, 10, S02002, doi: 10.1029/2011SW000731
[12]	Du D, Xu W Y, Zhao M X, et al. A sensitive geomagnetic activity index for space weather operation[J]. Space Weather, 2010, 8, S12006, doi: 10.1029/2010SW000609
[13]	Davis T N, Sugiura M. Auroral electrojet activity index AE and its universal time variation[J]. J. Geophys. Res., 1966, 71:785-801
[14]	Della-Rose Devin J. An Investigation of Variable-time Interval ''K-like''Geomagnetic Indices[D]. Logan: Utah State University, 1999
[15]	Wu K L, Yang M S. Alternative C-means clustering algorithms[J]. Pattern Recog., 2002, 35:2267-2278
[16]	Yang Qiuju, Liang Jimin, Liu Junming, et al. A method for automatic identification of substorm expansion phase onset from UVI images[J]. Chin. J. Geophys., 2013, 56(5):1435-1447. In Chinese (杨秋菊, 梁继民, 刘俊明. 一种基于紫外极光图像的亚暴膨胀期起始时刻的自动检测方法[J]. 地球物理报, 2013, 56(5):1435-1447)
[17]	Xu Wenyao. Physics of Electromagnetic Phenomena of the Earth[M]. Hefei: Press of University of Science and Technology of China, 2009. In Chinese (徐文耀. 地球电磁现象物理学[M]. 合肥: 中国科学技术大学出版社, 2009)
[18]	Russell C T, Mcpherron R L. Semiannual variation of geomagnetic activity[J]. J. Geophys. Res., 1973, 78(1):92-108
[19]	Cliver E W, Kamide Y, Ling A G. Mountains versus valleys: Semiannual variation of geomagnetic activity[J]. J. Geophys. Res., 2000, 105(A2):2413-2424
[20]	Kivelson M G, Russell C T. Introduction to Space Physics[M]. Cambridge: Cambridge University Press, 1995:402-420
[21]	Li Qi, Gao Yufen, Han Desheng. Analysis on magnetic storms reported by Beijing observatory[J]. J. Atmos. Terr. Phys., 2005, 67:853-861
[22]	Wu Yingyan, Xu Wenyao, Chen Gengxiong, et al. Ground magnetic characteristics of the storm-time ring current asymmetry[J]. Sci. China: Earth Sci., 2008, 38(4):424-431. In Chinese (吴迎燕, 徐文耀, 陈耿雄, 等. 暴时环电流不对称性的地面磁场特征研究[J]. 中国科学: 地球科学, 2008, 38(4):424-431)
[23]	Ridley A J, Liemohn M W. A model-derived storm time asymmetric ring current driven electric field description[J]. J. Geophys. Res., 2002, 107, A8, doi:10. 1029/2001-JA000051