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Volume 61 Supplement 4

Special Issue: Coupling Processes in the Equatorial Atmosphere (CPEA)

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

Earth, Planets and Space volume 61, pages e13–e16 (2009)Cite this article

Abstract

Local time (LT) variations of the averaged H-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.

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Authors and Affiliations

  1. SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China

    T. Araki

  2. Japan Meteorological Agency, Tokyo, Japan

    S. Tsunomura

  3. Solar Terrestrial Environmental Laboratory, Nagoya University, Nagoya, Japan

    T. Kikuchi

Authors
  1. T. Araki
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  2. S. Tsunomura
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  3. T. Kikuchi
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Corresponding author

Correspondence to T. Araki.

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Araki, T., Tsunomura, S. & Kikuchi, T. Local time variation of the amplitude of geomagnetic sudden commencements (SC) and SC-associated polar cap potential. Earth Planet Sp 61, e13–e16 (2009). https://doi.org/10.1186/BF03353154

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  • DOI: https://doi.org/10.1186/BF03353154

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