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

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

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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
Volume117
Issue number12
DOIs
Publication statusPublished - Dec 31 2012

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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