Characteristics of Seasonal Variation and Solar Activity Dependence of the Geomagnetic Solar Quiet Daily Variation

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  • Atsuki Shinbori
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Yukinobu Koyama
    National Institute of Technology Oita College Oita Japan
  • Masahito Nosé
    World Data Center for Geomagnetism Kyoto University Kyoto Japan
  • Tomoaki Hori
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Yuichi Otsuka
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan

書誌事項

公開日
2017-10
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2017ja024342
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Characteristics of seasonal variation and solar activity dependence of the <jats:italic>X</jats:italic> and <jats:italic>Y</jats:italic> components of the geomagnetic solar quiet (Sq) daily variation at Memambetsu in midlatitudes and Guam near the equator have been investigated using long‐term geomagnetic field data with 1 h time resolution from 1957 to 2016. The monthly mean Sq variation in the <jats:italic>X</jats:italic> and <jats:italic>Y</jats:italic> components (Sq‐<jats:italic>X</jats:italic> and Sq‐<jats:italic>Y</jats:italic>) shows a clear seasonal variation and solar activity dependence. The amplitude of seasonal variation increases significantly during high solar activities and is proportional to the solar <jats:italic>F</jats:italic><jats:sub>10.7</jats:sub> index. The pattern of the seasonal variation is quite different between Sq‐<jats:italic>X</jats:italic> and Sq‐<jats:italic>Y</jats:italic>. The result of the correlation analysis between the solar <jats:italic>F</jats:italic><jats:sub>10.7</jats:sub> index and the Sq‐<jats:italic>X</jats:italic> and Sq‐<jats:italic>Y</jats:italic> shows an almost linear relationship, but the slope of the linear fitted line varies as a function of local time and month. This implies that the sensitivity of Sq‐<jats:italic>X</jats:italic> and Sq‐<jats:italic>Y</jats:italic> to the solar activity is different for different local times and seasons. The pattern of the local time and seasonal variations of Sq‐<jats:italic>Y</jats:italic> at Guam shows good agreement with that of a magnetic field produced by interhemispheric field‐aligned currents (FACs), which flow from the summer to winter hemispheres in the dawn and dusk sectors and from the winter to summer hemispheres in the prenoon to afternoon sectors. The direction of the interhemispheric FAC in the dusk sector is opposite to the concept of Fukushima's model.</jats:p>

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