Earthquake Science

, Volume 23, Issue 4, pp 343–348 | Cite as

V: A new index to represent the variation rate of geomagnetic activity

  • Dongmei YangEmail author
  • Yufei He
  • Chuanhua Chen
  • Jiadong Qian


By calculating the hourly standard deviation of the first-order differences of the horizontal geomagnetic component minute data, a new index Vr to represent the variation rate of the geomagnetic field was introduced. Vr-indices show similar trends in the temporal change at different observatories and have simultaneous peak values at the observatories covering a large span geographically, which reveals that the source of geomagnetic disturbances represented by Vr is in the magnetosphere. Based on the comparison among Vr, Kp and ap, it is found that generally Vr changes linearly with Kp and ap, which means that the rapid changes of magnetic field usually exist together with magnetic disturbances. But there are exceptions. As Vr can be easily produced by individual observatory in quasi real time and is more sensitive to the variation rate of geomagnetic field rather than the field itself, it can be expected to serve for monitoring or predicting the geomagnetic-induced event in a quick and intuitive way.

Key words

Vr index first-order difference standard deviation variation rate of geomagnetic field geomagnetic-induced event 

CLC number



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Copyright information

© The Seismological Society of China and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Dongmei Yang
    • 1
    Email author
  • Yufei He
    • 1
  • Chuanhua Chen
    • 2
  • Jiadong Qian
    • 3
  1. 1.Institute of GeophysicsChina Earthquake AdministrationBeijingChina
  2. 2.Tai’an Magnetic ObservatoryEarthquake Administration of Shandong ProvinceTai’anChina
  3. 3.Institute of Earthquake ScienceChina Earthquake AdministrationBeijingChina

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