DOI: 10.1002/2013GL058307
论文题名: Postmidnight bubbles and scintillations in the quiet-time June solstice
作者: Yizengaw E. ; Retterer J. ; Pacheco E.E. ; Roddy P. ; Groves K. ; Caton R. ; Baki P.
刊名: Geophysical Research Letters
ISSN: 0094-8413
EISSN: 1944-8144
出版年: 2013
卷: 40, 期: 21 起始页码: 5592
结束页码: 5597
语种: 英语
英文关键词: equatorial bubbles
; equatorial scintillation
; postmidnight
Scopus关键词: Dusk sector
; Keypoints
; Local time
; Physics-based modeling
; Plasma irregularities
; postmidnight
; Rayleigh-Taylor instabilities
; Statistical study
; Electric fields
; Plasma density
; Scintillation
; bubble
; magnetic property
; numerical model
; plasma
; Rayleigh number
; Africa
英文摘要: While the mechanism for producing plasma irregularities in the dusk sector is believed to be fairly well understood, the cause of the formation of irregularities and bubbles during the postmidnight sector is still unknown, especially for magnetically quiet periods. This paper presents a case study of the strong postmidnight bubbles that often occur during magnetically quiet periods primarily in June solstice, along with a 4 year (2009-2012) statistical study that shows strong occurrence peak during June solstice predominantly in the African sector. We also confirm, for the first time, the presence of Rayleigh-Taylor (RT) instability during postmidnight hours by using the physics-based model for plasma densities and RT growth rates. Finally, we consider several possible sources of the eastward electric fields that permit the RT instability to develop and form bubbles in the postmidnight local time sector. Key Points Strong postmidnight bubbles occurrence during magnetically quiet periods The presence of Rayleigh-Taylor (RT) instability during postmidnight hours. Strong occurrence peak occurs during June solstice predominantly over Africa ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887561117&doi=10.1002%2f2013GL058307&partnerID=40&md5=b153f5c6f5a5f769011bc409a8aefd78
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5677
Appears in Collections: 气候减缓与适应
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作者单位: Institute for Scientific Research, Boston College, Chestnut Hill, MA 02467, United States
Recommended Citation:
Yizengaw E.,Retterer J.,Pacheco E.E.,et al. Postmidnight bubbles and scintillations in the quiet-time June solstice[J]. Geophysical Research Letters,2013-01-01,40(21).