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  • 标题:Ground geomagnetic field and GIC response to March 17, 2015, storm
  • 本地全文:下载
  • 作者:Olga V. Kozyreva ; Vyacheslav A. Pilipenko ; Vladimir B. Belakhovsky
  • 期刊名称:Earth, Planets and Space
  • 电子版ISSN:1880-5981
  • 出版年度:2018
  • 卷号:70
  • 期号:1
  • 页码:1-13
  • DOI:10.1186/s40623-018-0933-2
  • 出版社:Springer Verlag
  • 摘要:The St.Patrick’s Day geomagnetic storm on March 17, 2015, has been chosen by the space community for synergetic analysis to build a more comprehensive picture of the storm’s origin and evolution.This storm had an unusually long (~ 17 h) main phase.During this period, many substorm-like activations occurred.These activations resulted in bursts of geomagnetically induced currents (GICs) in power lines on the Kola peninsula.To examine the substorm activations in more detail, we apply various data processing techniques for the world-wide array of magnetometers: the virtual magnetograms, magnetic latitude–local time (MLT) snapshots, and magnetic keograms.These techniques are simple tools that are supplementary to more advanced facilities developed for the analysis of SuperDARN, IMAGE, and CARISMA arrays.We compare the global spatial localization and time evolution of the geomagnetic X -component disturbance and magnetic field variability measured by the Hilbert transform of time derivative d B /d t .The latitude-MLT mapping of these magnitudes shows that very often a region with highest magnetic variability does not overlap with a substorm “epicenter” but is shifted to its poleward or equatorward boundaries.Highest variability of the geomagnetic field, and consequently intense GICs, are caused by medium-scale fast varying structures.There is no one-to-one correspondence between substorm intensity and GIC magnitude.
  • 关键词:Geomagnetic storm; Substorm; Geomagnetically induced currents; Virtual magnetometer
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