Local time variation of the amplitude of geomagnetic sudden commencements (SC) and SC-associated polar cap potential

T. Araki, S. Tsunomura, T. Kikuchi

doi:10.1186/bf03353154

Local time variation of the amplitude of geomagnetic sudden commencements (SC) and SC-associated polar cap potential

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書誌事項

公開日: 2009-04

権利情報

https://creativecommons.org/licenses/by/4.0/
https://creativecommons.org/licenses/by/4.0/

DOI

10.1186/bf03353154

公開者: Springer Science and Business Media LLC

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説明

<jats:title>Abstract</jats:title> <jats:p>Local time (LT) variations of the averaged <jats:italic>H</jats:italic>-component amplitude of geomagnetic sudden commencements (SCs) observed at Memambetsu (geomagnetic latitude 35.4°) are derived separately for the summer and winter season. The amplitude was found to be higher at nighttime than daytime in both seasons, and the LT variations showed a good agreement with calculated LT variations of the resultant magnetic field due to a pair of fieldaligned currents (FACs) and ionospheric currents produced by the FACs. The DL- and DP-component of the disturbance field of SC can be separated based on a comparison of the observed and calculated LT variations. A method is introduced by which we can estimate the potential voltage difference associated with the FACs in the polar cap.</jats:p>