MLT and seasonal dependence of auroral electrojets: IMAGE magnetometer network observations

doi:10.1002/2014JA019843

	MLT and seasonal dependence of auroral electrojets: IMAGE magnetometer network observations
	Guo, Jianpeng 1,2; Liu, Huixin 2; Feng, Xueshang 1; Pulkkinen, T. I.3; Tanskanen, E. I.4,5; Liu, Chaoxu 1; Zhong, Dingkun 1; Wang, Yuan 6,7
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2014-04-01
卷号	119 期号:4 页码:3179-3188
关键词	auroral electrojets MLT dependence seasonal variation
ISSN号	2169-9380
DOI	10.1002/2014JA019843
文献子类	Article
英文摘要	Total eastward and westward electrojet currents (EEJ and WEJ) and their central latitudes derived from the International Monitor for Auroral Geomagnetic Effects (IMAGE) network magnetic measurements are analyzed for the combined MLT (magnetic local time) and seasonal dependence during the period 1995-2009. EEJ shows a strong MLT variation with significant dependence on season. During summer months the maxima occur around 1600-1800 MLT, whereas during winter months the maxima occur around 1800-2000 MLT. Moreover, the summer maxima are much larger than the winter maxima and appear at higher latitudes. The summer maxima are mainly associated with the solar EUV conductivity effect, while the winter maxima are mainly due to the contribution of northward convective electric field. EEJ exhibits a dominant annual variation with maximum in summer and minimum in winter. WEJ also exhibits a strong MLT variation with significant dependence on season. The maxima occur around 0200-0400 MLT during summer months, around 0000-0200 MLT during winter months, and around 0000-0400 MLT during equinoctial months. Moreover, the equinoctial maxima are much larger than the summer and winter maxima and appear at relatively lower latitudes. The seasonal variations in WEJ are the combinations of annual variations and semiannual variations. Both annual and semiannual variations show significant dependence on MLT. These results increase our knowledge on what factors contribute to the auroral electrojets as well as their magnetic signatures and hence help us better understand the limitations of global auroral electrojet indices, such as the AE and SME indices.
WOS关键词	ELEMENTARY CURRENT SYSTEMS ; GEOMAGNETIC-ACTIVITY ; SEMIANNUAL VARIATION ; INDEXES ; IONOSPHERE ; CURRENTS ; FIELD ; DISTRIBUTIONS ; BEHAVIOR ; AE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000336218600055
资助机构	Chinese Academy of Sciences(KZZD-EW-01-4) ; Chinese Academy of Sciences(KZZD-EW-01-4) ; 973 program(2012CB825601) ; 973 program(2012CB825601) ; National Natural Science Foundation of China(41031066 ; National Natural Science Foundation of China(41031066 ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; NICT International Exchange Program ; NICT International Exchange Program ; JSPS(25800274) ; JSPS(25800274) ; Shisedo Science grant ; Shisedo Science grant ; EU/FP7 ESPAS ; EU/FP7 ESPAS ; Academy of Finland(272157) ; Academy of Finland(272157) ; 41231068 ; 41231068 ; 41204127 ; 41204127 ; 41374187) ; 41374187) ; Chinese Academy of Sciences(KZZD-EW-01-4) ; Chinese Academy of Sciences(KZZD-EW-01-4) ; 973 program(2012CB825601) ; 973 program(2012CB825601) ; National Natural Science Foundation of China(41031066 ; National Natural Science Foundation of China(41031066 ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; NICT International Exchange Program ; NICT International Exchange Program ; JSPS(25800274) ; JSPS(25800274) ; Shisedo Science grant ; Shisedo Science grant ; EU/FP7 ESPAS ; EU/FP7 ESPAS ; Academy of Finland(272157) ; Academy of Finland(272157) ; 41231068 ; 41231068 ; 41204127 ; 41204127 ; 41374187) ; 41374187) ; Chinese Academy of Sciences(KZZD-EW-01-4) ; Chinese Academy of Sciences(KZZD-EW-01-4) ; 973 program(2012CB825601) ; 973 program(2012CB825601) ; National Natural Science Foundation of China(41031066 ; National Natural Science Foundation of China(41031066 ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; NICT International Exchange Program ; NICT International Exchange Program ; JSPS(25800274) ; JSPS(25800274) ; Shisedo Science grant ; Shisedo Science grant ; EU/FP7 ESPAS ; EU/FP7 ESPAS ; Academy of Finland(272157) ; Academy of Finland(272157) ; 41231068 ; 41231068 ; 41204127 ; 41204127 ; 41374187) ; 41374187) ; Chinese Academy of Sciences(KZZD-EW-01-4) ; Chinese Academy of Sciences(KZZD-EW-01-4) ; 973 program(2012CB825601) ; 973 program(2012CB825601) ; National Natural Science Foundation of China(41031066 ; National Natural Science Foundation of China(41031066 ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; NICT International Exchange Program ; NICT International Exchange Program ; JSPS(25800274) ; JSPS(25800274) ; Shisedo Science grant ; Shisedo Science grant ; EU/FP7 ESPAS ; EU/FP7 ESPAS ; Academy of Finland(272157) ; Academy of Finland(272157) ; 41231068 ; 41231068 ; 41204127 ; 41204127 ; 41374187) ; 41374187)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85016]
专题	中国科学院地质与地球物理研究所
通讯作者	Guo, Jianpeng
作者单位	1.Chinese Acad Sci, CSSAR, State Key Lab Space Weather, SIGMA Weather Grp, Beijing, Peoples R China 2.Kyushu Univ, Fac Sci, Dept Earth & Planetary Sci, Fukuoka 812, Japan 3.Aalto Univ, Sch Elect Engn, Espoo, Finland 4.Finnish Meteorol Inst, FIN-00101 Helsinki, Finland 5.Univ Bergen, Dept Phys & Technol, Bergen, Norway 6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Ionospher Environm, Beijing, Peoples R China 7.Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Guo, Jianpeng,Liu, Huixin,Feng, Xueshang,et al. MLT and seasonal dependence of auroral electrojets: IMAGE magnetometer network observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2014,119(4):3179-3188.
APA	Guo, Jianpeng.,Liu, Huixin.,Feng, Xueshang.,Pulkkinen, T. I..,Tanskanen, E. I..,...&Wang, Yuan.(2014).MLT and seasonal dependence of auroral electrojets: IMAGE magnetometer network observations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,119(4),3179-3188.
MLA	Guo, Jianpeng,et al."MLT and seasonal dependence of auroral electrojets: IMAGE magnetometer network observations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 119.4(2014):3179-3188.