| DOI: | 10.1002/2015GL063173
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| 论文题名: | Coexisting structures from high-and low-energy precipitation in fine-scale aurora |
| 作者: | Dahlgren H.; Lanchester B.S.; Ivchenko N.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8891
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| EISSN: | 1944-8622
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| 出版年: | 2015
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| 卷: | 42, 期:5 | | 起始页码: | 1290
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| 结束页码: | 1296
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| 语种: | 英语
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| 英文关键词: | aurora
; fine-scale structure
; high-energy precipitation
; low-energy precipitation
; multispectral observations
; pulsations
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| Scopus关键词: | Ionosphere
; Aurora
; Auroral emission
; Fine-scale structures
; Local instability
; Low energy electrons
; Multi-spectral
; Pulsations
; Small-scale structures
; Electrons
; atmospheric electricity
; aurora
; energy flux
; frequency-magnitude distribution
; precipitation (climatology)
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| 英文摘要: | High-resolution multimonochromatic measurements of auroral emissions have revealed the first optical evidence of coexisting small-scale auroral features resulting from separate high-and low-energy populations of precipitating electrons on the same field line. The features exhibit completely separate motion and morphology. From emission ratios and ion chemistry modeling, the average energy and energy flux of the precipitation is estimated. The high-energy precipitation is found to form large pulsating patches of 0.1 Hz with a 3 Hz modulation, and nonpulsating coexisting discrete auroral filaments. The low-energy precipitation is observed simultaneously on the same field line as discrete filaments with no pulsation. The simultaneous structures do not interact, and they drift with different speeds in different directions. We suggest that the high-and low-energy electron populations are accelerated by separate mechanisms, at different distances from Earth. The small-scale structures could be caused by local instabilities above the ionosphere. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925872747&doi=10.1002%2f2015GL063173&partnerID=40&md5=dc23c987a48842b35ce3fee9170149e8
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8507
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| 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: | Space and Plasma Physics, School of Electrical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
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| Recommended Citation: | |
Dahlgren H.,Lanchester B.S.,Ivchenko N.. Coexisting structures from high-and low-energy precipitation in fine-scale aurora[J]. Geophysical Research Letters,2015-01-01,42(5).
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