Sq current system during stratospheric sudden warming events in 2006 and 2009

Yosuke Yamazaki, Arthur D. Richmond, Huixin Liu, Kiyohumi Yumoto, Yoshimasa Tanaka

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18 Citations (Scopus)


Ionospheric Sq current systems during unusually strong and prolonged stratospheric sudden warming (SSW) events in January 2006 and January 2009 are examined by analyzing ground-magnetometer data for the American and Asian longitude sectors. During these SSW events, a significant decrease and increase of the Sq equivalent current intensity are observed in the Northern and Southern Hemispheres, respectively, along with a reduction in the longitudinal separation between the northern and southern current vortices. Numerical experiments using the National Center for Atmospheric Research Thermosphere-Ionosphere-Electrodynamics General-Circulation Model show that changes in the solar anti-symmetric (2,3) semidiurnal tide can bring about similar changes in the Sq current system.

Original languageEnglish
Article numberA12313
JournalJournal of Geophysical Research: Space Physics
Issue number12
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Geophysics


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