DOI: 10.1002/2015GL065575
论文题名: Why the Viking descent probes found only one ionospheric layer at Mars
作者: Mayyasi M. ; Mendillo M.
刊名: Geophysical Research Letters
ISSN: 0094-9406
EISSN: 1944-9137
出版年: 2015
卷: 42, 期: 18 起始页码: 7359
结束页码: 7365
语种: 英语
英文关键词: ionospheric structure
; Mars
Scopus关键词: Carrier concentration
; Electron density measurement
; Electrons
; Ionosphere
; Probes
; Radio transmission
; Chemical process
; Ionospheric model
; Ionospheric structures
; Mars
; Profile shapes
; Radio occultations
; Secondary peak
; Solar photons
; Satellites
; electron density
; geometry
; ionosphere
; Mars
; numerical model
; observational method
; satellite imagery
英文摘要: Radio wave transmissions from satellites revealed that Mars had two relatively distinct layers of ionization: a maximum electron density near 130 km, and a secondary layer near 110 km. When the Viking descent probes - with their in situ observing capabilities - passed through the ionosphere, the peak electron density was found, with no indication of a secondary layer below. Here we use an ionospheric model to show that profiles of electron density versus height have shapes that favor the detection of two layers at local times near dawn and dusk (where many thousands of radio occultation observations have been made), but that the two layers essentially merge into one during midday hours (when Viking measurements were made). The profile shapes are attributed to ionizing geometry of solar photons and to chemical processes that affect the profile shapes in a way that favors secondary peak formation near sunrise and sunset. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945242579&doi=10.1002%2f2015GL065575&partnerID=40&md5=3ac0080955e3c8a66bd057ba1d3a94d2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9021
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:
Mayyasi M.,Mendillo M.. Why the Viking descent probes found only one ionospheric layer at Mars[J]. Geophysical Research Letters,2015-01-01,42(18).