Seasonal and static gravity field of Mars from MGS, Mars Odyssey and MRO radio science

被引：126
|
作者：
Genova, Antonio [1 ,2 ]
Goossens, Sander [2 ,3 ]
Lemoine, Frank G. [2 ]
Mazarico, Erwan [2 ]
Neumann, Gregory A. [2 ]
Smith, David E. [1 ]
Zuber, Maria T. [1 ]
机构：
[1] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] Univ Maryland Baltimore Cty, CRESST, Baltimore, MD 21250 USA
来源：
ICARUS | 2016年 / 272卷
关键词：
(Mars; interior); polar caps); (Tides; solid body); TIME-VARIABLE GRAVITY; ACCELEROMETER DATA; INTERNAL STRUCTURE; MARTIAN GRAVITY; TOPOGRAPHY; AEROBRAKING; ORIENTATION; ATMOSPHERE; EVOLUTION; ACCURACY;
D O I：
10.1016/j.icarus.2016.02.050
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a spherical harmonic solution of the static gravity field of Mars to degree and order 120, GMM-3, that has been calculated using the Deep Space Network tracking data of the NASA Mars missions, Mars Global Surveyor (MGS), Mars Odyssey (ODY), and the Mars Reconnaissance Orbiter (MRO). We have also jointly determined spherical harmonic solutions for the static and time-variable gravity field of Mars, and the Mars k(2) Love numbers, exclusive of the gravity contribution of the atmosphere. Consequently, the retrieved time-varying gravity coefficients and the Love number k(2) solely yield seasonal variations in the mass of the polar caps and the solid tides of Mars, respectively. We obtain a Mars Love number k(2) of 0.1697 +/- 0.0027 (3-sigma). The inclusion of MRO tracking data results in improved seasonal gravity field coefficients C-30 and, for the first time, C-50. Refinements of the atmospheric model in our orbit determination program have allowed us to monitor the odd zonal harmonic C-30 for similar to 1.5 solar cycles (16 years). This gravity model shows improved correlations with MOLA topography up to 15% larger at higher harmonics (l = 60-80) than previous solutions. (C) 2016 Elsevier Inc. All rights reserved.
引用
收藏
页码：228 / 245
页数：18
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