DOI: 10.1002/grl.50960
论文题名: A new type of Doppler velocity fluctuations in HF ground scatter from the polar cap
作者: Scoular G. ; Ponomarenko P.V. ; St.-Maurice J.P.
刊名: Geophysical Research Letters
ISSN: 0094-8524
EISSN: 1944-8255
出版年: 2013
卷: 40, 期: 19 起始页码: 4992
结束页码: 4997
语种: 英语
英文关键词: HF radar
; Pc3-4
; polar cap
; SuperDARN
; ULF waves
Scopus关键词: HF radars
; Pc3-4
; Polar cap
; SuperDARN
; ULF waves
; Ionosphere
; Ionospheric measurement
; Radar
; Doppler effect
; ice cap
; ionosphere
; latitude
; polar meteorology
; precipitation (climatology)
; radar imagery
; radio wave
; wave propagation
英文摘要: We report a new type of variations in Doppler velocity of HF ground scatter echoes from the polar cap at f∼10 mHz. Similar fluctuations from lower latitudes are usually associated with large-scale dayside Pc3-4 ULF waves. However, the polar cap oscillations exhibit a puzzling anisotropy in spatial coherence along and across the radar's line of sight. Furthermore, in contrast to Pc3-4 waves, these fluctuations show no ground magnetic signatures and display a pronounced gap in power/occurrence around local noon. We hypothesize that localized, ≤100 km, auroral particle precipitations near the radar site can modulate Doppler shift of the radio waves entering the ionosphere. In the ground scatter returns, due to the geometrical spread of the rays propagating through the ionosphere to the ground, these variations would appear to have a much larger line-of-sight scale. Key Points A new type of Doppler fluctuations was observed in the polar cap using HF radars These fluctuations are distinct from those caused by ULF waves We suggest that they might be caused by localized particle precipitations ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884770538&doi=10.1002%2fgrl.50960&partnerID=40&md5=1c13aef03102dcc14a4e350b08b50bcd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5788
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Space and Atmospheric Studies, University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N5E2, Canada
Recommended Citation:
Scoular G.,Ponomarenko P.V.,St.-Maurice J.P.. A new type of Doppler velocity fluctuations in HF ground scatter from the polar cap[J]. Geophysical Research Letters,2013-01-01,40(19).