DOI: 10.1002/2015GL063121
论文题名: SWARM observations of equatorial electron densities and topside GPS track losses
作者: Buchert S. ; Zangerl F. ; Sust M. ; André M. ; Eriksson A. ; Wahlund J.-E. ; Opgenoorth H.
刊名: Geophysical Research Letters
ISSN: 0094-8788
EISSN: 1944-8519
出版年: 2015
卷: 42, 期: 7 起始页码: 2088
结束页码: 2092
语种: 英语
英文关键词: equator
; GPS
; ionosphere
; irregularities
; Langmuir Probe
Scopus关键词: Global positioning system
; Ionosphere
; Ionospheric measurement
; Langmuir probes
; Probes
; Background density
; Density gradients
; Equator
; Equatorial plasma bubble
; Ionospheric irregularities
; Irregularities
; Orders of magnitude
; Phase scintillations
; Signal receivers
; altitude
; amplitude
; electron density
; GPS
; ionosphere
; magnetic field
英文摘要: The SWARM satellites have both upward looking GPS receivers and Langmuir probes. The receivers repeatedly lost track of the L1 band signal in January-February 2014 at postsunset hours, when SWARM was at nearly 500 km altitude. This indicates that the signal was disturbed by ionospheric irregularities at this height and above. The track losses occurred right at density gradients associated with equatorial plasma bubbles and predominantly where the measured background density was highest. The signal showed strong phase scintillations rather than in amplitude, indicating that SWARM might be in the near field of an ionospheric phase screen. Density biteouts, depletions between steep gradients, were up to almost 3 orders of magnitude deep in the background of a more shallow trough centered at the magnetic equator. Comparison between satellites shows that the biteout structure strongly varied in longitude over ∼100 km and has in north-south steep walls. Key Points Irregularities causing L1 band GPS disturbances are at 500 km height and above Often GPS track losses at 500 km height correspond to local density gradients The postsunset equatorial density trough can be very variable in longitude ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928701842&doi=10.1002%2f2015GL063121&partnerID=40&md5=65517364d291fe30d2b0c687e06a52fa
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8404
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Swedish Institute of Space Physics, Uppsala, Sweden
Recommended Citation:
Buchert S.,Zangerl F.,Sust M.,et al. SWARM observations of equatorial electron densities and topside GPS track losses[J]. Geophysical Research Letters,2015-01-01,42(7).