Lunar Core and TidesVariations in rotation and orientation of the Moon are sensitive to solid-body tidal dissipation, dissipation due to relative motion at the fluid-core/solid-mantle boundary, and tidal Love number k2 [1,2]. There is weaker sensitivity to flattening of the core-mantle boundary (CMB) [2,3,4] and fluid core moment of inertia . Accurate Lunar Laser Ranging (LLR) measurements of the distance from observatories on the Earth to four retroreflector arrays on the Moon are sensitive to lunar rotation and orientation variations and tidal displacements. Past solutions using the LLR data have given results for dissipation due to solid-body tides and fluid core  plus Love number [1-5]. Detection of CMB flattening, which in the past has been marginal but improving [3,4,5], now seems significant. Direct detection of the core moment has not yet been achieved.
Williams, J. G. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Boggs, D. H. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ratcliff, J. T. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
August 21, 2013
January 1, 2004
Publication: Lunar and Planetary Science XXXV: Lunar Geophysics: Rockin' and a-Reelin'