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Low Latitude Ionospheric TPC Oscillations Associated With Periodic Changes in IMF Bz Polarity

文献类型：期刊论文

作者Li, Guozhu1,2,3; Ning, Baiqi2,3; Zhao, Xiukuan2,3; Sun, Wenjie2; Hu, Lianhuan2,3; Xie, Haiyong2,3; Liu, Kangkang1,3; Ajith, K. K.3
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2019-08-28
卷号46期号:16页码:9379-9387
ISSN号0094-8276
DOI10.1029/2019GL084428
英文摘要An Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia was recently deployed. Using ionospheric total electron content (TEC) from the two crossed Beidou geostationary satellite receiver chains of the network along 110 degrees E and 23 degrees N and Doppler velocity measurements from the Sanya (18.3 degrees N, 109.6 degrees E) portable digital ionosonde, we report first observations of low latitude TEC oscillations synchronized over a wide longitude range in East/Southeast Asia, which occur at nighttime, after the main phase of the geomagnetic storm on 20 April 2018. A comparison among TEC and Doppler velocity and interplanetary magnetic field (IMF) Bz component shows that the periodic TEC enhancements correlate with F region downward plasma drifts and IMF Bz southward turnings. The results suggest that the quasiperiodic southward turnings of IMF Bz could produce multiple short-lived westward prompt penetration electric fields, which contribute to driving the nighttime low latitude TEC oscillations simultaneously over the wide longitude range. Plain Language Summary Regional-scale positive/negative ionospheric storm effects have been widely investigated using GPS total electron content (TEC) and ionosonde observations. Here we report significant nighttime TEC oscillations detected at latitudes lower than the equatorial ionization anomaly crest in the longitudes of 95-120 degrees E by the Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia during geomagnetic storm. Periodic TEC enhancements are nearly synchronized over the wide longitude range, in close association with downward plasma drifts at low latitude. The good consistence between the changes of plasma vertical drift and of interplanetary magnetic field Bz polarity indicates that multiple short-lived westward prompt penetration electric fields could drive the periodic downward plasma drifts, which are very likely to cause low-pressure region of topside ionosphere at low latitude and subsequent flowing of plasma from higher latitudes (equatorial ionization anomaly crest) to the low-pressure region. The extra plasma sourced from higher latitudes, which is against the loss of increased recombination due to F region height decrease, could contribute to the TEC oscillations. Compared with the TEC measurements by GPS receiver network that are affected by satellite motion, the Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia, which measures TEC at fixed ionospheric pierce points along the same longitude/latitude by receiving Beidou geostationary satellite signals, provides a unique means for fine-scale observations of ionospheric perturbations not previously possible.
WOS关键词EQUATORIAL IONOSPHERE ; ELECTRIC-FIELDS ; GPS NETWORK ; PENETRATION ; FOUNTAIN ; SYSTEM ; TEC
资助项目National Natural Science Foundation of China[41727803] ; National Natural Science Foundation of China[41574149] ; National Natural Science Foundation of China[41474135] ; National Natural Science Foundation of China[41621063]
WOS研究方向Geology
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000490966700009
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/93889]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Li, Guozhu
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing, Peoples R China
3.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Li, Guozhu,Ning, Baiqi,Zhao, Xiukuan,et al. Low Latitude Ionospheric TPC Oscillations Associated With Periodic Changes in IMF Bz Polarity[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(16):9379-9387.
APA Li, Guozhu.,Ning, Baiqi.,Zhao, Xiukuan.,Sun, Wenjie.,Hu, Lianhuan.,...&Ajith, K. K..(2019).Low Latitude Ionospheric TPC Oscillations Associated With Periodic Changes in IMF Bz Polarity.GEOPHYSICAL RESEARCH LETTERS,46(16),9379-9387.
MLA Li, Guozhu,et al."Low Latitude Ionospheric TPC Oscillations Associated With Periodic Changes in IMF Bz Polarity".GEOPHYSICAL RESEARCH LETTERS 46.16(2019):9379-9387.

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来源：地质与地球物理研究所

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