A method of estimating the Martian neutral atmospheric density at 130 km, and comparison of its results with Mars Global Surveyor and Mars Odyssey aerobraking observations based on the Mars Climate Database outputs

IF 2.9 3区 地球科学
JunFeng Qin, Hong Zou, YuGuang Ye, YongQiang Hao, JinSong Wang, Erling Nielsen
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引用次数: 1

Abstract

Profiles of the Martian dayside ionosphere can be used to derive the neutral atmospheric densities at 130 km, which can also be obtained from the Mars Climate Database (MCD) and spacecraft aerobraking observations. In this research, we explain the method used to calculate neutral densities at 130 km via ionosphere observations and three long-period 130-km neutral density data sets at northern high latitudes (latitudes > 60°) acquired through ionospheric data measured by the Mars Global Surveyor (MGS) Radio Occultation Experiment. The calculated 130-km neutral density data, along with 130-km density data from the aerobraking observations of the MGS and Mars Odyssey (ODY) in the northern high latitudes, were compared with MCD outputs at the same latitude, longitude, altitude, solar latitude, and local time. The 130-km density data derived from both the ionospheric profiles and aerobraking observations were found to show seasonal variations similar to those in the MCD data. With a negative shift of about 2 × 10 10 cm−3, the corrected 130-km neutral densities derived from MCD v4.3 were consistent with those obtained from the two different observations. This result means that (1) the method used to derive the 130-km neutral densities with ionospheric profiles was effective, (2) the MCD v4.3 data sets generally overestimated the 130-km neutral densities at high latitudes, and (3) the neutral density observations from the MGS Radio Science Experiment could be used to calibrate a new atmospheric model of Mars.

一种估算火星130公里中性大气密度的方法,并将其结果与基于火星气候数据库输出的火星全球勘测者和火星奥德赛航空制动观测结果进行比较
火星日面电离层的剖面可以用来获得130 km处的中性大气密度,也可以从火星气候数据库(MCD)和航天器航空制动观测中获得。在本研究中,我们解释了通过电离层观测和北部高纬度地区的三个长周期130 km中性密度数据集计算130 km中性密度的方法。60°),通过火星全球勘测者(MGS)射电掩星实验测量的电离层数据获得。计算的130 km中性密度数据,以及MGS和火星奥德赛(Odyssey)在北部高纬度地区的航空制动观测数据,与相同纬度、经度、高度、太阳纬度和当地时间的MCD输出进行了比较。从电离层剖面和航空制动观测得到的130公里密度数据显示出与MCD数据相似的季节变化。MCD v4.3修正后的130 km中性密度与两个不同观测结果一致,负移约为2 × 10 10 cm−3。这意味着:(1)利用电离层剖面推算130 km中性密度的方法是有效的;(2)MCD v4.3数据集普遍高估了高纬度地区130 km中性密度;(3)MGS射电科学实验的中性密度观测可用于校准新的火星大气模型。
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来源期刊
Earth and Planetary Physics
Earth and Planetary Physics GEOSCIENCES, MULTIDISCIPLINARY-
自引率
17.20%
发文量
174
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