DOI: 10.1002/2015GL063349
论文题名: Height and time characteristics of seasonal and diurnal variations in PMWE based on 1 year observations by the PANSY radar (69.0S, 39.6E)
作者: Nishiyama T. ; Sato K. ; Nakamura T. ; Tsutsumi M. ; Sato T. ; Kohma M. ; Nishimura K. ; Tomikawa Y. ; Ejiri M.K. ; Tsuda T.T.
刊名: Geophysical Research Letters
ISSN: 0094-8790
EISSN: 1944-8521
出版年: 2015
卷: 42, 期: 7 起始页码: 2100
结束页码: 2108
语种: 英语
英文关键词: MST radar
; polar mesosphere winter echo
; solar proton event
; the Antarctic
; the PANSY radar
Scopus关键词: Charged particles
; Ionosphere
; Magnetosphere
; Protons
; Energetic electron precipitation
; MST radars
; Negatively charged
; Polar mesosphere
; Seasonal and diurnal variations
; Solar proton events
; The Antarctic
; Time characteristics
; Radar
; altitude
; ionization
; mesosphere
; radar imagery
; solar radiation
; spatiotemporal analysis
英文摘要: We report height and time variations in polar mesosphere winter echoes (PMWE) based on the Program of the Antarctic Syowa mesosphere-stratosphere-troposphere/incoherent scatter (PANSY) radar observations. PMWE were identified for 110 days from March to September 2013. PMWE occurrence frequency increased abruptly in May when two solar proton events occurred. PMWE were also observed even during periods without any solar proton events, suggesting that a possible cause of the PMWE is ionization by energetic electron precipitations. The monthly mean PMWE characteristics showed that occurrence of PMWE were mainly restricted to sunlit time. This fact indicates that electrons detached from negatively charged particles play an important role. While PMWE below 72 km in altitude completely disappeared before sunset, it was detected above that altitude for a few hours even after sunset. This height dependence in the altitude range of 60-80 km can be explained qualitatively by empirical effective recombination rates. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84928700070&doi=10.1002%2f2015GL063349&partnerID=40&md5=446ed9ca2a976a9aab521e57f9f3d95d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8406
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: National Institute of Polar Research, Tachikawa, Japan
Recommended Citation:
Nishiyama T.,Sato K.,Nakamura T.,et al. Height and time characteristics of seasonal and diurnal variations in PMWE based on 1 year observations by the PANSY radar (69.0S, 39.6E)[J]. Geophysical Research Letters,2015-01-01,42(7).