DOI: 10.1002/2015GL063096
论文题名: The equivalent slab thickness of Mars' ionosphere: Implications for thermospheric temperature
作者: Mendillo M. ; Narvaez C. ; Lawler G. ; Kofman W. ; Mouginot J. ; Morgan D. ; Gurnett D.
刊名: Geophysical Research Letters
ISSN: 0094-9569
EISSN: 1944-9300
出版年: 2015
卷: 42, 期: 9 起始页码: 3560
结束页码: 3568
语种: 英语
英文关键词: scale height
; slab thickness
; thermospheric temperature
Scopus关键词: Ionization of gases
; Ionospheric measurement
; Martian surface analysis
; Solar energy
; Asymptotic temperature
; Mars global surveyor
; MARS-EXPRESS
; Planetary ionospheres
; Scale height
; Slab thickness
; Solar zenith angle
; Total electron content
; Ionosphere
; electron density
; Mars
; planetary atmosphere
; planetary surface
; thermosphere
; zenith angle
英文摘要: The total electron content (TEC) of a planetary ionosphere is dominated by plasma near and above the height of maximum electron density (Nmax ). The ratio TEC/Nmax represents the thickness (τ) of a TEC slab of uniform density (Nmax ). For a photochemical ionosphere, τ relates to the scale height (H=kT/mg) of the ionized neutral gas as τ∼4×H. Derived temperatures refer to ∼160km in thermosphere height - below the asymptotic temperature of the exosphere. The MARSIS instrument on Mars Express has produced data sets of TEC and Nmax . We used them to form τ patterns versus solar zenith angle and solar cycle phase. For daytime (SZA<90°) conditions, <τ>day ∼50km, decreasing rapidly for solar zenith angle (SZA)>90° to<τ>night ∼25km. These correspond to Tn values of 250°K and 125°K. Using Mars Global Surveyor data, τ patterns show a mild dependence upon the solar EUV flux proxy F10.7 , with ΔTn (°K)∼0.3° per unit change in F10.7 at Mars. Key Points The ratio TEC/Nmax of a planetary ionosphere represents the slab thickness Slab thickness relates to the neutral atmosphere's scale height and temperature Mars' ionosphere has a nighttime slab thickness of 25 km that doubles in daytime ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930484372&doi=10.1002%2f2015GL063096&partnerID=40&md5=c773c050e1d2a8d86725dccc516d9551
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9184
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:
Mendillo M.,Narvaez C.,Lawler G.,et al. The equivalent slab thickness of Mars' ionosphere: Implications for thermospheric temperature[J]. Geophysical Research Letters,2015-01-01,42(9).