DOI: 10.1002/2017JA025072
Scopus记录号: 2-s2.0-85045276478
论文题名: Climatology of the Occurrence Rate and Amplitudes of Local Time Distinguished Equatorial Plasma Depletions Observed by Swarm Satellite
作者: Wan X. ; Xiong C. ; Rodriguez-Zuluaga J. ; Kervalishvili G.N. ; Stolle C. ; Wang H.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 4 起始页码: 3014
结束页码: 3026
语种: 英语
英文关键词: climatology
; depletion amplitude
; equatorial plasma depletion
; postmidnight
; swarm LP
英文摘要: In this study, we developed an autodetection technique for the equatorial plasma depletions (EPDs) and their occurrence and depletion amplitudes based on in situ electron density measurements gathered by Swarm A satellite. For the first time, comparisons are made among the detected EPDs and their amplitudes with the loss of Global Positioning System (GPS) signal of receivers onboard Swarm A, and the Swarm Level-2 product, Ionospheric Bubble Index (IBI). It has been found that the highest rate of EPD occurrence takes place generally between 2200 and 0000 magnetic local time (MLT), in agreement with the IBI. However, the largest amplitudes of EPD are detected earlier at about 1900–2100 MLT. This coincides with the moment of higher background electron density and the largest occurrence of GPS signal loss. From a longitudinal perspective, the higher depletion amplitude is always witnessed in spatial bins with higher background electron density. At most longitudes, the occurrence rate of postmidnight EPDs is reduced compared to premidnight ones; while more postmidnight EPDs are observed at African longitudes. CHAMP observations confirm this point regardless of high or low solar activity condition. Further by comparing with previous studies and the plasma vertical drift velocity from ROCSAT-1, we suggest that while the F region vertical plasma drift plays a key role in dominating the occurrence of EPDs during premidnight hours, the postmidnight EPDs are the combined results from the continuing of former EPDs and newborn EPDs, especially during June solstice. And these newborn EPDs during postmidnight hours seem to be less related to the plasma vertical drift. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114204
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: College of Electronic Information, Wuhan University, Wuhan, China; GFZ German Research Centre for Geosciences, Potsdam, Germany; Faculty of Science, University of Potsdam, Potsdam, Germany
Recommended Citation:
Wan X.,Xiong C.,Rodriguez-Zuluaga J.,et al. Climatology of the Occurrence Rate and Amplitudes of Local Time Distinguished Equatorial Plasma Depletions Observed by Swarm Satellite[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(4)