Substorm onset timing via traveltime magnetoseismology
Substorm onset timing via traveltime magnetoseismology
复制标题
DOI：
10.1029/2008gl036574
复制
发表时间：
2009-04-28
影响因子：
5.2
通讯作者：
Ohtani, S.
中科院分区：
文献类型：
--
作者：
Chi, P. J.;Russell, C. T.;Ohtani, S.
本文介绍了一种行时磁震技术，该技术可以通过对π 2脉动的多点观测来估计磁尾中亚暴的发生时间。地面磁力计观测到的π 2到达时间（定义为π 2振幅的第一个峰值）具有很强的纬度函数。利用Tamao旅行时作为正演模型，根据观测到的Pi 2到达时间进行磁震反演，推断1998年7月22日磁尾亚暴的开始时间与-20 RE相似，为6:53:10 UT，比地面记录中常规确定的Pi 2开始时间早1-3分钟。磁震结果进一步与极光增亮的观测结果进行了比较，揭示了这次亚暴期间一系列清晰的事件。引用本文：Chi， P. J， C. T. Russell和S. Ohtani(2009)，通过行时磁地震学的亚暴爆发时间，地球物理学。卷。， 36, L08107, doi: 10.1029/2008GL036574。
This letter introduces a traveltime magnetoseismic technique that can estimate the substorm onset time in the magnetotail from multi-point observations of Pi 2 pulsations. The arrival time of Pi 2, which is defined as the first peak in Pi 2 amplitude, observed by ground magnetometers presents a strong function of latitude. Using the Tamao traveltime as the forward model, the magnetoseismic inversion from the observed Pi 2 arrival time infers that the onset of the 22 July 1998 substorm in the magnetotail started at X similar to -20 RE at 6: 53: 10 UT, or 1-3 minutes earlier than the Pi 2 onset time conventionally identified in ground records. The magnetoseismic result is further compared with the observations of auroral brightening, revealing a clear sequence of events during this substorm. Citation: Chi, P. J., C. T. Russell, and S. Ohtani (2009), Substorm onset timing via traveltime magnetoseismology, Geophys. Res. Lett., 36, L08107, doi: 10.1029/2008GL036574.