DOI: 10.1002/2016GL070135
论文题名: Effects of the crustal magnetic fields on the Martian atmospheric ion escape rate
作者: Ramstad R. ; Barabash S. ; Futaana Y. ; Nilsson H. ; Holmström M.
刊名: Geophysical Research Letters
ISSN: 0094-8473
EISSN: 1944-8204
出版年: 2016
卷: 43, 期: 20 起始页码: 10574
结束页码: 10579
语种: 英语
英文关键词: ASPERA
; crustal field
; escape
; Mars
; Mars Express
; solar wind
Scopus关键词: Distribution functions
; Ions
; Magnetic fields
; Magnetism
; Solar wind
; ASPERA
; Crustal fields
; escape
; Mars
; MARS-EXPRESS
; Magnetoplasma
英文摘要: Eight years (2007–2015) of ion flux measurements from Mars Express are used to statistically investigate the influence of the Martian magnetic crustal fields on the atmospheric ion escape rate. We combine all Analyzer of Space Plasmas and Energetic Atoms/Ion Mass Analyzer (ASPERA-3/IMA) measurements taken during nominal upstream solar wind and solar extreme ultraviolet conditions to compute global average ion distribution functions, individually for the north/south hemispheres and for varying solar zenith angles (SZAs) of the strongest crustal magnetic field. Escape rates are subsequently calculated from each of the average distribution functions. The maximum escape rate (4.2 ± 1.2) × 1024s−1 is found for SZA = 60°–80°, while the minimum escape rate (1.7 ± 0.6) × 1024s−1 is found for SZA = 28°–60°, showing that the dayside orientation of the crustal fields significantly affects the global escape rate (p = 97%). However, averaged over time, independent of SZA, we find no statistically significant difference in the escape rates from the two hemispheres (escape from southern hemisphere 46% ± 18% of global rate). ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84995609205&doi=10.1002%2f2016GL070135&partnerID=40&md5=e6e60c5b95d21514032d5accaaaf6f58
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9436
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: Swedish Institute of Space Physics, Kiruna, Sweden
Recommended Citation:
Ramstad R.,Barabash S.,Futaana Y.,et al. Effects of the crustal magnetic fields on the Martian atmospheric ion escape rate[J]. Geophysical Research Letters,2016-01-01,43(20).