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    Rights statement: Accepted for publication in Journal of Geophysical Research: Space Physics. Copyright 2017 American Geophysical Union. Further reproduction or electronic distribution is not permitted.

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Quasi-biennial oscillation of the ionospheric wind dynamo

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<mark>Journal publication date</mark>03/2017
<mark>Journal</mark>Journal of Geophysical Research: Space Physics
Issue number3
Volume122
Number of pages17
Pages (from-to)3553-3569
<mark>State</mark>Published
Early online date7/03/17
<mark>Original language</mark>English

Abstract

The interannual variation of the ionospheric solar quiet (Sq) current system is examined. A dense magnetometer network over Japan enables the accurate determination of the central position of the northern Sq current loop or the Sq current focus, during 1999–2015. It is found that the Sq focus latitude undergoes an interannual variation of ±2° with a period of approximately 28 months, similar to the quasi-biennial oscillation (QBO) in the tropical lower stratosphere. The QBO-like variation of Sq is particularly evident during 2005–2013. No corresponding interannual variability is found in solar extreme ultraviolet radiation. Comparisons with tidal winds, derived from a whole-atmosphere model, reveal that the QBO-like variation of the Sq current focus is highly correlated with the amplitude variations of migrating and nonmigrating diurnal tides in the lower thermosphere. The results suggest that the stratospheric QBO can influence the ionospheric wind dynamo through the QBO modulation of tides.

Bibliographic note

Accepted for publication in Journal of Geophysical Research: Space Physics. Copyright 2017 American Geophysical Union. Further reproduction or electronic distribution is not permitted.