DOI: 10.1016/j.asr.2020.01.013
论文题名: Effect of moderate geomagnetic storms on equatorial plasma bubbles over eastern Africa in the year 2012: Evolution and electrodynamics
作者: Giday N.M. ; Katamzi-Joseph Z.T. ; Stoneback R.
刊名: Advances in Space Research
ISSN: 2731177
出版年: 2020
卷: 65, 期: 7 语种: 英语
英文关键词: C/NOFS
; Equatorial electrojets
; Equatorial plasma bubbles
Scopus关键词: Atmospheric electricity
; Geomagnetism
; Global positioning system
; Ionization
; Ionosphere
; Ionospheric measurement
; Radio navigation
; Scintillation
; Communication and navigation systems
; Equatorial and low latitudes
; Equatorial electrojet
; Equatorial ionization anomalies (EIA)
; Equatorial plasma bubble
; Ionospheric irregularities
; Radio wave scintillations
; Total electron content
; Storms
英文摘要: Equatorial plasma bubbles (EPBs) are common features of the equatorial and low-latitude ionosphere and are known to cause radio wave scintillation which leads to the degradation of communication and navigation systems. Although these structures have been studied for decades, a full understanding of their evolution and dynamics remains important for space weather mitigation purposes. In this study, we present cases of EPBs occurrences around April and July 2012 geomagnetic storm periods over the African equatorial sector. The EPBs were observed from the Communications/Navigation Outage Forecasting System (C/NOFS) and generally correlated well to the ionospheric irregularities observed from the Global Positioning System total electron content (GPS-TEC) measurements (rate of TEC change, ROT). This study revealed that the evolution of the EPBs during moderate storms is controlled by the strength of the daytime equatorial electrojet (EEJ) currents regardless of the strength of the equatorial ionization anomaly (EIA), the latter is observed during the July storm case in particular. These effects were more evident during the main and part of the early recovery phases of the geomagnetic storm days considered. However, the evening hours TEC gradients between regions of the magnetic equator and ionization crests also played roles in the existence of ionospheric irregularities. © 2020 COSPAR Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158533
Appears in Collections: 气候变化与战略
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作者单位: Department of Space Science and Applications Research, Ethiopian Space Science and Technology Institute, Addis Ababa, Ethiopia; South African National Space Agency (SANSA) Space Science, Hermanus, South Africa; Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa; W. B. Hanson Center for Space Sciences, University of Texas at Dallas, Richardson, TX, United States
Recommended Citation:
Giday N.M.,Katamzi-Joseph Z.T.,Stoneback R.. Effect of moderate geomagnetic storms on equatorial plasma bubbles over eastern Africa in the year 2012: Evolution and electrodynamics[J]. Advances in Space Research,2020-01-01,65(7)