DOI: 10.1002/2017JA024557
Scopus记录号: 2-s2.0-85041113257
论文题名: Field-Aligned GPS Scintillation: Multisensor Data Fusion
作者: Mrak S. ; Semeter J. ; Hirsch M. ; Starr G. ; Hampton D. ; Varney R.H. ; Reimer A.S. ; Swoboda J. ; Erickson P.J. ; Lind F. ; Coster A.J. ; Pankratius V.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 974
结束页码: 992
语种: 英语
英文关键词: auroral region
; geomagnetic substorm
; GPS phase scintillation
; GPS scintillation
; high-latitude scintillation
; ionospheric irregularities
英文摘要: The Mahali Global Positioning System (GPS) array (9 receivers, 15–30 km baseline distance) in central Alaska has probed auroral structures in a field-aligned direction during a geomagnetic substorm on 7 October 2015. We present results from a collaborative study of GPS phase scintillation, optical emission brightness, and ionospheric density perturbations, by virtue of data fusion procedure from the Mahali GPS array, all-sky imager (ASI), and the Poker Flat Incoherent Scatter Radar (PFISR). First, we present observations in a traditional way using colocated GPS-ASI sensors, giving us a principal pattern of the phase scintillation with respect to auroral brightness, free of any mapping ambiguities. Next, we use an assumption that the plasma irregularities are located at an altitude of 120 km, we map the optical data to this altitude, and we extend the GPS-ASI study over the entire field of view of the GPS receiver array. We obtain a repeatable and persuasive pattern, revealing that GPS phase scintillation is clustered at the auroral edges. Moreover, investigation of the colinear ISR observations supports the altitude assumption of scintillation producing irregularities, and PFISR-derived electric field estimates suggest that the source for irregularities is gradient drift instability. The phase scintillation was observed on all GPS receivers, phase scintillation exceeded once cycle during several electrojet intensifications, and several events lasted for more than a minute. Finally, phase scintillation was observed during all surge events, independent of the particular auroral morphology. ©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/114788
Appears in Collections: 气候减缓与适应
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作者单位: Department of Electrical and Computer Engineering and Center for Space Physics, Boston University, Boston, MA, United States; Geophysical Institute, University of Alaska, Fairbanks, AK, United States; Center for Geospace Studies, SRI International, Menlo Park, CA, United States; Haystack Observatory, Massachusetts Institute of Technology, Westford, MA, United States
Recommended Citation:
Mrak S.,Semeter J.,Hirsch M.,et al. Field-Aligned GPS Scintillation: Multisensor Data Fusion[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)