DOI: 10.1002/2015GL065804
论文题名: A strong seasonal dependence in the Martian hydrogen exosphere
作者: Bhattacharyya D. ; Clarke J.T. ; Bertaux J.-L. ; Chaufray J.-Y. ; Mayyasi M.
刊名: Geophysical Research Letters
ISSN: 0094-9617
EISSN: 1944-9348
出版年: 2015
卷: 42, 期: 20 起始页码: 8678
结束页码: 8685
语种: 英语
英文关键词: exosphere
; hydrogen
; Mars
; seasons
Scopus关键词: Dust
; Hydrogen
; Ionosphere
; Space telescopes
; Storms
; Upper atmosphere
; Water supply
; Atmospheric dynamics
; exosphere
; Heliocentric distances
; Hubble space telescopes
; Mars
; Seasonal dependence
; Seasonal variation
; seasons
; Solar power generation
; atmospheric dynamics
; detection method
; dust storm
; hydrogen
; Martian atmosphere
; seasonal variation
; space technology
; spatiotemporal analysis
; upper atmosphere
英文摘要: Hubble Space Telescope and Mars Express observed unexpected rapid changes in the Martian hydrogen exosphere involving a decrease in scattered Lyman α intensity in fall 2007 (solar longitude, Ls = 331°-345°). These changes detected were speculated to be a combination of seasonal variation and/or dust storms and lower atmospheric dynamics. Here we present Hubble Space Telescope observations of Mars in 2014 over a broad range of heliocentric distances and seasons (Ls = 138°-232°) which indicate a factor of ~3.5 change in Martian Lyman α brightness associated with a factor of ~5.4 variation of hydrogen escape flux in the absence of global dust storms and significant solar variability. We thus conclude that seasonal effects have a strong influence on the hydrogen exosphere, which in turn has major implications for the processes that control water supply to the Martian upper atmosphere and the history of water escape from Mars. Key Points Strong variation of hydrogen density and escape from Mars is reported Strong seasonal variation observed in 2014 during low dust activity Mars water escape history depends on understanding these variations © 2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946555826&doi=10.1002%2f2015GL065804&partnerID=40&md5=798a0687d8fae4ce6af8edbd742151e5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9232
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: Center for Space Physics, Boston University, Boston, MA, United States
Recommended Citation:
Bhattacharyya D.,Clarke J.T.,Bertaux J.-L.,et al. A strong seasonal dependence in the Martian hydrogen exosphere[J]. Geophysical Research Letters,2015-01-01,42(20).