NDLI: Influence of seasonal variation of neutral winds on the coupling between North and South Hemispheres in a realistic Earth main field

Content Provider	Springer Nature Link
Author	Yang, YaFen Chen, ChuXin
Copyright Year	2009
Abstract	The neutral wind dynamo contributes significantly to the ionospheric electrodynamics, and the variation of the neutral winds thus affects the ionosphere. Here we study the effects of the seasonal variation of the winds in a realistic Earth main field. The two-dimensional ionospheric dynamo equation is expressed in the framework of a revision of the International Geomagnetic Reference Field (IGRF) under the assumptions of equipotential field lines and conservation of current. A revision of IGRF and typical uniform conductance are used to isolate the effects of the seasonal variation of the winds. Our results show that the potential and the currents in solstice seasons are much different from those in equinox seasons. The gradients of the potential are steeper in solstice seasons than in equinox seasons,and similarly the shell currents are stronger in solstice seasons, due to the stronger neutral winds, than in equinox seasons. Correspondingly, the Birkeland currents in solstice seasons are 2–3 times larger than those in equinox seasons, and that the Birkeland currents are much stronger in winter than in summer. Consequently, this suggests that the couplings between North and South Hemispheres are much stronger in solstice seasons than in equinox seasons, and likewise they are stronger in winter than in summer.
Starting Page	1661
Ending Page	1672
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	52
Issue Number	10
e-ISSN	18622801
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-09-16
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	neutral winds seasonal variation shell currents Birkeland currents coupling realistic Earth main field Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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