Meridional movement of northern and southern equatorial ionization anomaly crests in the East-Asian sector during 2002–2003 SSW

Xiao Hua Mo, Dong He Zhang, Larisa Petrovna Goncharenko, Shun Rong Zhang, Yong Qiang Hao, Zuo Xiao, Jia Zheng Pei, Akimasa Yoshikawa, Ha Duyen Chau

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

The present paper investigates the asymmetrical variability of the location of the north and the south equatorial ionization anomaly (EIA) crests in the East-Asian sector, along with their association with simultaneous observations of equatorial electrojet (EEJ) strength, geomagnetic activity index, and solar flux index during the 2002–2003 sudden stratospheric warming (SSW) event. Analysis of these observations indicates the existence of a large-scale quasi 16-day periodic meridional movement in both EIA crests, and also reveals a strong correlation between the quasi 16-day oscillation in geomagnetic latitudes of the EIA crest and EEJ strength. The latitude of the northern/southern EIA crest and the EEJ strength indicate that obvious synchronous periodic oscillations were in-phase in the northern and southern hemisphere when the SSW occurred. In addition, it is also found that both the EIA crest location and amplitude of the periodic movement of the EIA locations exhibit hemispheric asymmetry. The amplitude of the periodic movement of the EIA location in the southern hemisphere is larger than that of the northern hemisphere, and the southern EIA crest is further off from the equator than the north one. Understanding these asymmetries requires a combination of mechanisms that involve at least trans-equator meridional winds and the position of a sub-solar point; however, potential disturbances in neutral winds associated with the SSW may additionally complicate the equatorial ionospheric dynamics.

元の言語英語
ページ(範囲)776-785
ページ数10
ジャーナルScience China Earth Sciences
60
発行部数4
DOI
出版物ステータス出版済み - 4 1 2017

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ionization
anomaly
electrojet
Southern Hemisphere
asymmetry
equatorial dynamics
Northern Hemisphere
oscillation
sudden stratospheric warming
disturbance

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

これを引用

Meridional movement of northern and southern equatorial ionization anomaly crests in the East-Asian sector during 2002–2003 SSW. / Mo, Xiao Hua; Zhang, Dong He; Goncharenko, Larisa Petrovna; Zhang, Shun Rong; Hao, Yong Qiang; Xiao, Zuo; Pei, Jia Zheng; Yoshikawa, Akimasa; Chau, Ha Duyen.

:: Science China Earth Sciences, 巻 60, 番号 4, 01.04.2017, p. 776-785.

研究成果: ジャーナルへの寄稿記事

Mo, Xiao Hua ; Zhang, Dong He ; Goncharenko, Larisa Petrovna ; Zhang, Shun Rong ; Hao, Yong Qiang ; Xiao, Zuo ; Pei, Jia Zheng ; Yoshikawa, Akimasa ; Chau, Ha Duyen. / Meridional movement of northern and southern equatorial ionization anomaly crests in the East-Asian sector during 2002–2003 SSW. :: Science China Earth Sciences. 2017 ; 巻 60, 番号 4. pp. 776-785.
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abstract = "The present paper investigates the asymmetrical variability of the location of the north and the south equatorial ionization anomaly (EIA) crests in the East-Asian sector, along with their association with simultaneous observations of equatorial electrojet (EEJ) strength, geomagnetic activity index, and solar flux index during the 2002–2003 sudden stratospheric warming (SSW) event. Analysis of these observations indicates the existence of a large-scale quasi 16-day periodic meridional movement in both EIA crests, and also reveals a strong correlation between the quasi 16-day oscillation in geomagnetic latitudes of the EIA crest and EEJ strength. The latitude of the northern/southern EIA crest and the EEJ strength indicate that obvious synchronous periodic oscillations were in-phase in the northern and southern hemisphere when the SSW occurred. In addition, it is also found that both the EIA crest location and amplitude of the periodic movement of the EIA locations exhibit hemispheric asymmetry. The amplitude of the periodic movement of the EIA location in the southern hemisphere is larger than that of the northern hemisphere, and the southern EIA crest is further off from the equator than the north one. Understanding these asymmetries requires a combination of mechanisms that involve at least trans-equator meridional winds and the position of a sub-solar point; however, potential disturbances in neutral winds associated with the SSW may additionally complicate the equatorial ionospheric dynamics.",
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AU - Mo, Xiao Hua

AU - Zhang, Dong He

AU - Goncharenko, Larisa Petrovna

AU - Zhang, Shun Rong

AU - Hao, Yong Qiang

AU - Xiao, Zuo

AU - Pei, Jia Zheng

AU - Yoshikawa, Akimasa

AU - Chau, Ha Duyen

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