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Storm-Enhanced Development of Postsunset Equatorial Plasma Bubbles Around the Meridian 120 degrees E/60 degrees W on 7-8 September 2017
Li, Guozhu; Ning, Baiqi; Wang, Chi; Abdu, M. A.; Otsuka, Yuichi; Yamamoto, M.; Wu, Jian; Chen, Jinsong
作者部门空间科学部
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2018
卷号123期号:9页码:7985-7998
DOI10.1029/2018JA025871
ISSN2169-9380
语种英语
关键词equatorial plasma bubbles geomagnetic storm disturbance electric field west-tilted structure westward drifts international space weather meridian circle program
摘要Storm time development of equatorial plasma bubbles (EPBs) around the meridian 120 degrees E/60 degrees W during early September 2017, when the Bz component of interplanetary magnetic field (IMF) experienced two large southward excursions, producing a strong geomagnetic storm that included two main phase decreases, was investigated. The observations from networks of Global Navigation Satellite Systems total electron content receivers, very high frequency radars, and ionosondes operated around the meridian reveal that in the American and Asian sectors, intense EPB irregularities developed and extended to dip latitudes of similar to 30 degrees N and 46 degrees N, respectively, following rapid sunset F layer height rises during two episodes of strong southward IMF Bz excursions. The storm-enhanced EPB irregularities, however, were not observed following the sunset terminator in the Pacific sector, where the sunset rise of F layer was not detected. More interestingly, the EPBs in the Asian sector were observed to drift toward the west, with velocity increasing from similar to 30 m/s at low latitude to similar to 95 m/s at middle latitude. The poleward increasing westward drifts drove the formation of west-titled structure of irregularities. For the EPBs in the American sector, no apparent west-tilted structure was detected. The results indicate that the prompt penetration undershielding electric fields (PPEF) of eastward polarity resulting from the two IMF Bz southward excursions dominated the generation of postsunset EPBs in the American and Asian sectors, respectively. The westward drifts of PPEF-induced EPBs in the Asian sector could be attributed dominantly to disturbance westward wind, with a possible contribution to it arising from the PPEF. Plain Language Summary The development and evolution of equatorial plasma bubbles (EPBs) exhibit complex global behavior during geomagnetic storms. In recent years, an international space weather meridian circle program, which aims to provide a global picture of unfolding space weather events by using diverse instruments along the approximate meridian 120 degrees E/60 degrees W, that is, the Asian and American longitude sectors, was launched. Considering the sunset interval (similar to 12 hr) between the two longitudes, it is expected that the development of postsunset EPBs, if enhanced in one region by short-lived prompt penetration electric fields (PPEF), would be inhibited in the other region under the delayed and long duration effect of disturbance dynamo electric fields. Here we report a unique case of significantly enhanced postsunset EPBs developments by PPEF in both the American and Asian sectors, but their total absence by disturbance dynamo electric fields in the Pacific sector during the September 2017 geomagnetic storm sequence. Moreover, the PPEF-induced EPBs along the meridian show different characteristics, with apparent west-tilted structure in the Asian sector but not in the American sector. This sort of study based on the international space weather meridian circle program observations will strengthen our understanding on the generation and evolution characteristics of EPBs during geomagnetic storms.
收录类别SCI
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文献类型期刊论文
条目标识符http://ir.nssc.ac.cn/handle/122/6569
专题空间科学部
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Li, Guozhu,Ning, Baiqi,Wang, Chi,et al. Storm-Enhanced Development of Postsunset Equatorial Plasma Bubbles Around the Meridian 120 degrees E/60 degrees W on 7-8 September 2017[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2018,123(9):7985-7998.
APA Li, Guozhu.,Ning, Baiqi.,Wang, Chi.,Abdu, M. A..,Otsuka, Yuichi.,...&Chen, Jinsong.(2018).Storm-Enhanced Development of Postsunset Equatorial Plasma Bubbles Around the Meridian 120 degrees E/60 degrees W on 7-8 September 2017.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,123(9),7985-7998.
MLA Li, Guozhu,et al."Storm-Enhanced Development of Postsunset Equatorial Plasma Bubbles Around the Meridian 120 degrees E/60 degrees W on 7-8 September 2017".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123.9(2018):7985-7998.
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