DOI: 10.1002/grl.50392
论文题名: Dependence of O+ escape rate from the Venusian upper atmosphere on IMF directions
作者: Masunaga K. ; Futaana Y. ; Stenberg G. ; Barabash S. ; Zhang T.L. ; Fedorov A. ; Okano S. ; Terada N.
刊名: Geophysical Research Letters
ISSN: 0094-9113
EISSN: 1944-8844
出版年: 2013
卷: 40, 期: 9 起始页码: 1682
结束页码: 1685
语种: 英语
英文关键词: ASPERA-4
; escape rate
; IMF direction
; oxygen
; plasma
; Venus
Scopus关键词: Acceleration mechanisms
; ASPERA-4
; Escape rate
; IMF direction
; Interplanetary magnetic fields
; Space plasmas
; Venus
; Venus Express
; Oxygen
; Plasmas
; Upper atmosphere
; Interplanetary flight
; acceleration
; data set
; magnetic field
; oxygen
; planetary atmosphere
; plasma
; upper atmosphere
; Venus
; Venusia
英文摘要: We investigate the dependence of the O+ escape rate on the upstream interplanetary magnetic field (IMF) direction by using data from the Analyser of Space Plasma and Energetic Atoms (ASPERA-4) instrument and the magnetometer (MAG) onboard Venus Express. We consider two cases, namely the perpendicular IMF case (167 events) and the parallel IMF case (82 events), where IMF is nearly perpendicular to the Venus-Sun line and nearly parallel to it. By integrating O+ fluxes observed on the nightside, total O+ escape rates of (5.8 ± 2.9) × 1024 s-1 (perpendicular IMF case) and (4.9 ± 2.2) × 1024 s -1 (parallel IMF case) are obtained. As these values are not significantly different, the upstream IMF direction does not affect the total amount of O+ outflow from Venus. The different acceleration mechanisms must balance each other in order to keep the escape rate the same. Key Points The Venusian O+ escape rate does not depend on the upstream IMF directionSpatial distributions of escaping O+ ions from Venus depend on the IMF directionDifferent acceleration mechanisms must balance each other for different IMF ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879102267&doi=10.1002%2fgrl.50392&partnerID=40&md5=447848a74e184d45fbd002f83f898c45
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6377
Appears in Collections: 气候减缓与适应
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作者单位: Swedish Institute of Space Physics, Box 812, SE-98128, Kiruna, Sweden
Recommended Citation:
Masunaga K.,Futaana Y.,Stenberg G.,et al. Dependence of O+ escape rate from the Venusian upper atmosphere on IMF directions[J]. Geophysical Research Letters,2013-01-01,40(9).