中国科学院国家空间科学中心机构知识库
Advanced  
NSSC OpenIR  > 空间科学部  > 期刊论文
题名: The geomagnetic jerk of 2003.5-characterisation with regional observatory secular variation data
作者: Feng, Yan; Holme, Richard; Cox, Grace Alexandra; Jiang, Yi
作者部门: 空间科学部
通讯作者: Feng, Yan (frank_feng8848@163.com)
刊名: Physics of the Earth and Planetary Interiors
ISSN号: 0031-9201
出版日期: 2018
卷号: 278, 页码:47-58
收录类别: EI
英文摘要: The 2003.5 geomagnetic jerk was identified in geomagnetic records from satellite data, and a matching feature reported in variations in length-of-day (ΔLOD), but detailed study has been hampered by lack of geomagnetic observatory data where it appears strongest. Here we examine secular variation (annual differences of monthly means) based on a new resource of 43 Chinese observatory records for 1998 until the present, focusing on 10 series of particularly high quality and consistency. To obtain a clean series, we calculate the covariance matrix of residuals between measurements and a state-of-the-art field model, CHAOS-6, and use eigenvalue analysis to remove noisy contributions from the uncorrected data. The magnitude of the most significant eigenvector correlates well with Dcx (corrected, extended Dst), suggesting the noise originates from unmodelled external magnetic field. Removal of this noise eliminates much coherent misfit around 2003—2005; nevertheless, the 2003.5 jerk is seen clearly in the first time derivative of the East component in Chinese data, and is also seen in the first time derivative of the vertical component in European data. Estimates of the jerk time are centred on 2003.5, but with some spatial variation; this variation can be eliminated if we allow a discontinuity in the secular variation as well as its temporal gradient. Both regions also provide evidence for a jerk around 2014, although less clearly than 2003.5. We create a new field model based on new data and CHAOS-6 to further examine the regional signals. The new model is close to CHAOS-6, but better fits Chinese data, although modelling also identifies some data features as unphysical. © 2018 Elsevier B.V.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6247
Appears in Collections:空间科学部_期刊论文

Files in This Item:
File Name/ File Size Content Type Version Access License
201827847-58.pdf(5744KB)期刊论文作者接受稿限制开放View 联系获取全文
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Feng, Yan]'s Articles
[Holme, Richard]'s Articles
[Cox, Grace Alexandra]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Feng, Yan]‘s Articles
[Holme, Richard]‘s Articles
[Cox, Grace Alexandra]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: 201827847-58.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院国家空间科学中心 - Feedback
Powered by CSpace