DOI: 10.1002/2014GL062590
论文题名: Observation of polar cap patches and calculation of gradient drift instability growth times: A Swarm case study
作者: Spicher A. ; Cameron T. ; Grono E.M. ; Yakymenko K.N. ; Buchert S.C. ; Clausen L.B.N. ; Knudsen D.J. ; McWilliams K.A. ; Moen J.I.
刊名: Geophysical Research Letters
ISSN: 0094-9019
EISSN: 1944-8750
出版年: 2015
卷: 42, 期: 2 起始页码: 201
结束页码: 206
语种: 英语
英文关键词: gradient drift instability
; Swarm
Scopus关键词: Rockets
; Commissioning phase
; Gradient-drift instability
; Initial structures
; Polar cap patches
; Radio wave scintillations
; Rocket measurements
; Steep density gradients
; Swarm
; Scintillation
; drift (glacial deposit)
; drift behavior
; flow stability
; polar region
; radio wave
; satellite imagery
英文摘要: The Swarm mission represents a strong new tool to survey polar cap patches and plasma structuring inside the polar cap. In the early commissioning phase, the three Swarm satellites were operated in a pearls-on-a-string configuration making noon-midnight transpolar passes. This provides an unparalleled opportunity to examine the potential role of the gradient drift instability (GDI) process on polar cap patches by systematically calculating GDI growth times during their transit across the pole from day to night. Steep kilometer-scale gradients appeared in this study as initial structures that persisted during the approximate 90 min it took a patch to cross the polar cap. The GDI growth times were calculated for a selection of the steep density gradients on both the dayside and the nightside. The values ranged from 23 s to 147 s, which is consistent with recent rocket measurements in the cusp auroral region and provides a template for future studies. Growth times of the order of 1 min found both on the dayside and on the nightside support the existing view that the GDI may play a dominant role in the generation of radio wave scintillation irregularities as the patches transit the polar cap from day to night. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923542431&doi=10.1002%2f2014GL062590&partnerID=40&md5=5786e6f9ad24d261f26fa84cc3f668e1
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8635
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Department of Physics, University of Oslo, Oslo, Norway
Recommended Citation:
Spicher A.,Cameron T.,Grono E.M.,et al. Observation of polar cap patches and calculation of gradient drift instability growth times: A Swarm case study[J]. Geophysical Research Letters,2015-01-01,42(2).