Yaxian Li, Wanlin Gong, Chunxiao Yan, Kai Zhu, Min Zhang, Qiang Zhang
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The remarkable EPB-related density and total electron content (TEC) depletions measured by the satellite and GNSS receivers were also observed, which indicates the persistence of EPB irregularities until ∼06 LT. The significant elevation of bottomside F-layer's virtual height obtained by the Digisonde at Fuke as well as the upward vertical F-layer plasma drifts derived from a nearby Digisonde at Sanya (18.4°N, 109.6°E, dip latitude 13.1°N) both imply the existence of strong eastward perturbation electric fields after local midnight. These findings suggest that the collective effects of eastward overshielding penetration electric field (PEF) resulted from the substorm onset and rapid northward turning of the interplanetary magnetic field (IMF) Bz, surpassed the role of westward undershielding prompt penetration electric field (PPEF) induced by the southward turning of IMF Bz. 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引用次数: 0
摘要
本研究基于卫星和地面的多种观测资料,研究了2015年11月13日弱地磁活动期间后半夜到黎明赤道等离子体泡(EPB)不规则现象的演变特征和内在驱动机制。通过在中国福科(19.5°N,109.1°E,倾角纬度14.4°N)运行的甚高频相干散射雷达,发现新出现的场对齐不规则现象(FAIs)出现在雷达视场内,时间大约在零时4分37秒左右,并持续了40多分钟。卫星和全球导航卫星系统(GNSS)接收机还观测到了与EPB相关的密度和总电子含量(TEC)的明显衰减,这表明EPB不规则现象一直持续到零时6分。在福科(18.4°N,109.6°E,倾角纬度为 13.1°N)的 Digisonde 获得的底侧 F 层虚高的明显升高,以及在三亚(18.4°N,109.6°E,倾角纬度为 13.1°N)附近的 Digisonde 获得的 F 层等离子体垂直漂移的上升,都意味着在当地午夜之后存在着强烈的东向扰动电场。这些发现表明,亚暴发生和行星际磁场(IMF)Bz快速北转所产生的东向过屏蔽穿透电场(PEF)的集体效应,超过了行星际磁场(IMF)Bz南转所诱发的西向欠屏蔽快速穿透电场(PPEF)的作用。因此,前者在调节赤道/低纬度带状电场方面占主导地位,并大大提高了F层,从而促进了R-T不稳定性的增长,为后半夜到黎明EPB的发展创造了有利条件。
Freshly Developed Low-Latitude Postmidnight-To-Dawn F-Region Ionospheric Irregularities Over China on 13 November 2015
In this study, the evolutional features and underlying driving mechanisms of the postmidnight-to-dawn equatorial plasma bubble (EPB) irregularities during the weak geomagnetic activity period on 13 November 2015 were investigated based on the multiple satellite and ground-based observations. By using the coherent scatter radar operating at very high frequency at Fuke (19.5°N, 109.1°E, dip latitude 14.4°N), China, it was found that the freshly developed field-aligned irregularities (FAIs) occurred within the radar's field of view around ∼04:37 LT and sustained for more than 40 min. The remarkable EPB-related density and total electron content (TEC) depletions measured by the satellite and GNSS receivers were also observed, which indicates the persistence of EPB irregularities until ∼06 LT. The significant elevation of bottomside F-layer's virtual height obtained by the Digisonde at Fuke as well as the upward vertical F-layer plasma drifts derived from a nearby Digisonde at Sanya (18.4°N, 109.6°E, dip latitude 13.1°N) both imply the existence of strong eastward perturbation electric fields after local midnight. These findings suggest that the collective effects of eastward overshielding penetration electric field (PEF) resulted from the substorm onset and rapid northward turning of the interplanetary magnetic field (IMF) Bz, surpassed the role of westward undershielding prompt penetration electric field (PPEF) induced by the southward turning of IMF Bz. Thus, the former predominated in modulating the equatorial/low-latitude zonal electric fields and raised the F-layer considerably, which consequently boosted the growth of R-T instability and created the favorable conditions for the postmidnight-to-dawn EPBs development.
期刊介绍:
Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.