globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024715
Scopus记录号: 2-s2.0-85042270556
论文题名:
Seasonal Dependence of Geomagnetic Active-Time Northern High-Latitude Upper Thermospheric Winds
作者: Dhadly M.S.; Emmert J.T.; Drob D.P.; Conde M.G.; Doornbos E.; Shepherd G.G.; Makela J.J.; Wu Q.; Nieciejewski R.J.; Ridley A.J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:1
起始页码: 739
结束页码: 754
语种: 英语
英文关键词: data assimilation ; F region neutral winds ; geomagnetic active-time thermospheric winds ; high-latitude thermosphere ; ion-neutral coupling ; seasonal climatology
英文摘要: This study is focused on improving the poorly understood seasonal dependence of northern high-latitude F region thermospheric winds under active geomagnetic conditions. The gaps in our understanding of the dynamic high-latitude thermosphere are largely due to the sparseness of thermospheric wind measurements. With current observational facilities, it is infeasible to construct a synoptic picture of thermospheric winds, but enough data with wide spatial and temporal coverage have accumulated to construct a meaningful statistical analysis. We use long-term data from eight ground-based and two space-based instruments to derive climatological wind patterns as a function of magnetic local time, magnetic latitude, and season. These diverse data sets possess different geometries and different spatial and solar activity coverage. The major challenge is to combine these disparate data sets into a coherent picture while overcoming the sampling limitations and biases among them. In our previous study (focused on quiet time winds), we found bias in the Gravity Field and Steady State Ocean Circulation Explorer (GOCE) cross-track winds. Here we empirically quantify the GOCE bias and use it as a correction profile for removing apparent bias before empirical wind formulation. The assimilated wind patterns exhibit all major characteristics of high-latitude neutral circulation. The latitudinal extent of duskside circulation expands almost 10∘ from winter to summer. The dawnside circulation subsides from winter to summer. Disturbance winds derived from geomagnetic active and quiet winds show strong seasonal and latitudinal variability. Comparisons between wind patterns derived here and Disturbance Wind Model (DWM07) (which have no seasonal dependence) suggest that DWM07 is skewed toward summertime conditions. ©2017. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:30   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114799
Appears in Collections:气候减缓与适应

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作者单位: National Research Council Postdoctoral Research Associate, Space Science Division, Naval Research Laboratory, Washington, DC, United States; Space Science Division, Naval Research Laboratory, Washington, DC, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Aerospace Engineering, Delft University of Technology, Delft, Netherlands; Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada; Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States; High Altitude Observatory, UCAR, Boulder, CO, United States; Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States

Recommended Citation:
Dhadly M.S.,Emmert J.T.,Drob D.P.,et al. Seasonal Dependence of Geomagnetic Active-Time Northern High-Latitude Upper Thermospheric Winds[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)
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