Lunar interior properties from the GRAIL mission
Lunar interior properties from the GRAIL mission
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DOI：
10.1002/2013je004559
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发表时间：
2014-07
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影响因子：
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通讯作者：
James G. Williams;A. Konopliv;D. Boggs;R. Park;D. Yuan;F. LeMoine;S. Goossens;E. Mazarico;
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文献类型：
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作者：
James G. Williams;A. Konopliv;D. Boggs;R. Park;D. Yuan;F. LeMoine;S. Goossens;E. Mazarico;
重力恢复和内部实验室（GRAIL）任务以前所未有的精度和分辨率对月球重力进行了采样。月球的GM，即引力常数G和质量M的乘积，已经很好地确定了。然而，质量和平均密度（3345.56±0.40 kg/m3）的不确定性受到g值的精度的限制。g值的球面调和度- 2重力系数J2和C22，以及描述月球度- 2对潮汐力弹性响应的Love数k2，来自于喷气推进实验室和戈达德太空飞行中心对GRAIL主要任务3个月数据的两次独立分析。不确定度为~1%的两个k2测定值相差1%；参考半径R = 1738 km， 1个月平均值为0.02416±0.00022。月球激光测距（LLR）数据分析确定(C−A)/B和(B−A)/C，其中A < B < C为主转动惯量；流体外核的平坦化；固体边界处的耗散；月潮耗散Q = 37.5±4。惯性矩计算结合了GRAIL确定的J2和C22与LLR推导的(C−A)/B和(B−A)/C。固体月球的归一化平均惯性矩为is /MR2 = 0.392728±0.000012。与密度、矩和Love数相匹配，计算模型具有半径为200 ~ 380 km的流体外核，半径为0 ~ 280 km的固体内核，质量分数为0 ~ 1%，以及低地震剪切速度的深部地幔带。内外芯组合质量分数≤1.5%。
The Gravity Recovery and Interior Laboratory (GRAIL) mission has sampled lunar gravity with unprecedented accuracy and resolution. The lunar GM, the product of the gravitational constant G and the mass M, is very well determined. However, uncertainties in the mass and mean density, 3345.56 ± 0.40 kg/m3, are limited by the accuracy of G. Values of the spherical harmonic degree‐2 gravity coefficients J2 and C22, as well as the Love number k2 describing lunar degree‐2 elastic response to tidal forces, come from two independent analyses of the 3 month GRAIL Primary Mission data at the Jet Propulsion Laboratory and the Goddard Space Flight Center. The two k2 determinations, with uncertainties of ~1%, differ by 1%; the average value is 0.02416 ± 0.00022 at a 1 month period with reference radius R = 1738 km. Lunar laser ranging (LLR) data analysis determines (C − A)/B and (B − A)/C, where A < B < C are the principal moments of inertia; the flattening of the fluid outer core; the dissipation at its solid boundaries; and the monthly tidal dissipation Q = 37.5 ± 4. The moment of inertia computation combines the GRAIL‐determined J2 and C22 with LLR‐derived (C − A)/B and (B − A)/C. The normalized mean moment of inertia of the solid Moon is Is/MR2 = 0.392728 ± 0.000012. Matching the density, moment, and Love number, calculated models have a fluid outer core with radius of 200–380 km, a solid inner core with radius of 0–280 km and mass fraction of 0–1%, and a deep mantle zone of low seismic shear velocity. The mass fraction of the combined inner and outer core is ≤1.5%.