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    High-resolution Local Gravity Model of the South Pole of the Moon from GRAIL Extended Mission Data (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We estimated a high-resolution local gravity field model over the south pole of the Moon using data from the Gravity Recovery and Interior Laboratory's extended mission. Our solution consists of adjustments with respect to a global model expressed in spherical harmonics. The adjustments are expressed as gridded gravity anomalies with a resolution of 1/6deg by 1/6deg (equivalent to that of a degree and order 1080 model in spherical harmonics), covering a cap over the south pole with a radius of 40deg. The gravity anomalies have been estimated from a short-arc analysis using only Ka-band range-rate (KBRR) data over the area of interest. We apply a neighbor-smoothing constraint to our solution. Our local model removes striping present in the global model; it reduces the misfit to the KBRR data and improves correlations with topography to higher degrees than current global models.
    Keywords: Lunar and Planetary Science and Exploration; Geophysics
    Type: GSFC-E-DAA-TN15341 , AGU Fall Meeting 2014; Dec 15, 2014 - Dec 19, 2014; San Francisco, CA; United States
    Format: application/pdf
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  • 2
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    Local Lunar Gravity Field Analysis over the South Pole-aitken Basin from SELENE Farside Tracking Data (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We present a method with which we determined the local lunar gravity field model over the South Pole-Aitken (SPA) basin on the farside of the Moon by estimating adjustments to a global lunar gravity field model using SELENE tracking data. Our adjustments are expressed in localized functions concentrated over the SPA region in a spherical cap with a radius of 45deg centered at (191.1 deg E, 53.2 deg S), and the resolution is equivalent to a 150th degree and order spherical harmonics expansion. The new solution over SPA was used in several applications of geophysical analysis. It shows an increased correlation with high-resolution lunar topography in the frequency band l = 40-70, and admittance values are slightly different and more leveled when compared to other, global gravity field models using the same data. The adjustments expressed in free-air anomalies and differences in Bouguer anomalies between the local solution and the a priori global solution correlate with topographic surface features. The Moho structure beneath the SPA basin is slightly modified in our solution, most notably at the southern rim of the Apollo basin and around the Zeeman crater
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC-E-DAA-TN9230 , E02005 , Journal of Geophysical Research: Planets; 117; E2; 1-16
    Format: application/pdf
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