High-resolution lunar gravity fields from the GRAIL Primary and Extended Missions

被引：121

作者：

Konopliv, Alex S. ^{[1
]}

Park, Ryan S. ^{[1
]}

Yuan, Dah-Ning ^{[1
]}

Asmar, Sami W. ^{[1
]}

Watkins, Michael M. ^{[1
]}

Williams, James G. ^{[1
]}

Fahnestock, Eugene ^{[1
]}

Kruizinga, Gerhard ^{[1
]}

Paik, Meegyeong ^{[1
]}

Strekalov, Dmitry ^{[1
]}

Harvey, Nate ^{[1
]}

Smith, David E. ^{[2
]}

Zuber, Maria T. ^{[2
]}

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA

[2] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 05期

基金：

美国国家航空航天局;

关键词：

gravity; spherical harmonics; MOON; CRUST;

D O I：

10.1002/2013GL059066

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The resolution and accuracy of the lunar spherical harmonic gravity field have been dramatically improved as a result of the Gravity Recovery and Interior Laboratory (GRAIL) mission. From the Primary Mission, previous harmonic gravity fields resulted in an average n=420 surface resolution and a Bouguer spectrum to n=330. The GRAIL Extended Mission improves the resolution due to a lower average 23 km altitude orbit. As a result, new harmonic degree 900 gravity fields (GL0900C and GL0900D) show nearly a factor of 2 improvement with an average surface resolution n=870 and the Bouguer spectrum extended to n=550. Since the minimum spacecraft altitude varies spatially between 3km and 23km, the surface resolution is variable from near n=680 for the central farside to near n=900 for the polar regions. These gravity fields with 0.8 million parameters are by far the highest-degree fields of any planet ever estimated with a fully dynamic least squares technique using spacecraft tracking data. Key Points <list list-type="bulleted" id="grl51483-list-0001"> <list-item id="grl51483-li-0001">A degree 900 gravity field from the GRAIL Primary and Extended Mission <list-item id="grl51483-li-0002">The GRAIL Extended Mission doubles the resolution of the gravity field <list-item id="grl51483-li-0003">The Bouguer spectrum is well determined to near harmonic degree 550

引用

页码：1452 / 1458

页数：7

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