Latitudinal variation of ionospheric currents in Southeast Asian sector

Nurul Shazana Abdul Hamid, Wan Nur Izzaty Ismail, Akimasa Yoshikawa

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)


The equatorial electrojet (EEJ) is a current system caused by the enhanced ionospheric conductivity near the dayside magnetic dip equator. In this study, we attempt to obtain the latitudinal profile of Sq and total current component (EEJ+Sq) and consequently attain the EEJ latitudinal variation. Analysis is carried on using magnetic data recorded at six stations in Southeast Asian sector. The data used are equatorial electrojet index, EUEL, which were calculated from geomagnetic northward, H, component on geomagnetically quiet days. We further compared latitudinal profile of Sq and total current during solar minimum (2008) and solar maximum (2014) in order to study their solar cycle dependence. Furthermore, we examined the EEJ circuit for both solar activity period. Result shows that as the EEJ strength increase with solar activity, it contribute to higher increase in total current during 2014, and consequently contribute to significant difference in the total current latitudinal profile during 2008 and 2014. On the other hand, the EEJ latitudinal variation illustrates the current circuit where the reverse current was observed to start on the flanks of dip equator at about 5° and terminate at less than 10° latitude in both hemispheres.

ジャーナルAdvanced Science Letters
出版ステータス出版済み - 2月 2017

!!!All Science Journal Classification (ASJC) codes

  • コンピュータサイエンス一般
  • 健康(社会科学)
  • 数学一般
  • 教育
  • 環境科学一般
  • 工学一般
  • エネルギー一般


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