Geomagnetic field variation and the equivalent current system generated by an ionospheric dynamo at the solstice

Masahiko Takeda

doi:10.1016/0021-9169(90)90115-4

Geomagnetic field variation and the equivalent current system generated by an ionospheric dynamo at the solstice

DOI Web Site Web Site 被引用文献4件

Masahiko Takeda

書誌事項

公開日: 1990-01

権利情報

https://www.elsevier.com/tdm/userlicense/1.0/

DOI

10.1016/0021-9169(90)90115-4

公開者: Elsevier BV

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説明

Abstract The geomagnetic field variation and equivalent current system produced by an asymmetrical ionospheric dynamo action under a solstitial condition are simulated and compared with the observational results. Results of our simulation reproduce well most of the observational features of the solstitial Sq system. For example, the latitude of the current vortex center is higher in summer than in winter and the local time of the center in the summer hemisphere is located earlier than that in the winter hemisphere. In the morning and afternoon sector the current vortex in the summer hemisphere invades the winter hemisphere. The first feature is attributed to the ionospheric currents, but the second and third features are due to the field-aligned currents generated by the asymmetry of the ionospheric dynamo.