Frank Lemoine - Academia.edu (original) (raw)
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Papers by Frank Lemoine
Science (New York, N.Y.), Jan 28, 2016
The Orientale basin is the youngest and best-preserved major impact structure on the Moon. We use... more The Orientale basin is the youngest and best-preserved major impact structure on the Moon. We used the Gravity Recovery and Interior Laboratory (GRAIL) spacecraft to investigate the gravitational field of Orientale at 3- to 5-kilometer (km) horizontal resolution. A volume of at least (3.4 ± 0.2) × 10(6) km(3) of crustal material was removed and redistributed during basin formation. There is no preserved evidence of the transient crater that would reveal the basin's maximum volume, but its diameter may now be inferred to be between 320 and 460 km. The gravity field resolves distinctive structures of Orientale's three rings and suggests the presence of faults associated with the outer two that penetrate to the mantle. The crustal structure of Orientale provides constraints on the formation of multiring basins.
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This paper concerns the modeling of cladding using an Nd:YAG laser operating at low powers typica... more This paper concerns the modeling of cladding using an Nd:YAG laser operating at low powers typically less than 800 W. Experimental observation of the evolution of the mass of the clads shows two power thresholds. The theoretical study relies on a calculation of the fluence provided to the substrate and on a model of heat transfer into the substrate. The
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Agu Fall Meeting Abstracts, Dec 1, 2009
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Thermosphere densities from precise orbit determination of Mars Global Surveyor (MGS), Pioneer Ve... more Thermosphere densities from precise orbit determination of Mars Global Surveyor (MGS), Pioneer Venus Orbiter (PVO), and Magellan are used with contemporaneous data from 6 Earth-orbiting satellites to investigate the responses of these planetary satellite drag environments to changes in solar flux due to the Sun's rotation. For comparative purposes, these results are cast in the form of equivalent exosphere temperature
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Astrodynamics 1989, 1990
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Agu Fall Meeting Abstracts, Nov 29, 2001
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Recent changes in the cryosphere highlight the importance of methods for directly observing the c... more Recent changes in the cryosphere highlight the importance of methods for directly observing the complex spatial and temporal variation of land ice mass flux. Since its launch in March of 2002, the NASA/DLR Gravity Recovery and Climate Experiment (GRACE) mission has been acquiring ultra-precise inter-satellite K-band range and range-rate (KBRR) measurements providing new observations of the complex spatial and temporal
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ABSTRACT
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We examine various approaches to gain increased temporal and spatial resolution in mass flux esti... more We examine various approaches to gain increased temporal and spatial resolution in mass flux estimates made from spherical harmonic solutions based on GRACE K-band range rate (KBRR) data. Although some of the solutions we present use standard post-solution smoothing and averaging techniques, our study focuses only on techniques applied at the solution stage (during the estimation process). The advantage of
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Agu Fall Meeting Abstracts, 2006
On multi-decadal time scales or longer, the most important processes affecting sea level are thos... more On multi-decadal time scales or longer, the most important processes affecting sea level are those associated with the mass balance over the Earth's ice sheets. The vulnerability of the cryosphere to climate change along with the difficulty in acquiring uniform in situ observations in these inhospitable regions, makes the problem of understanding ice sheet mass trends a high Earth science
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Lunar and Planetary Science Conference, Mar 1, 1995
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Agu Fall Meeting Abstracts, Dec 1, 2006
The direct recovery of surface mass anomalies using GRACE KBRR data processed in regional solutio... more The direct recovery of surface mass anomalies using GRACE KBRR data processed in regional solutions holds great promise for producing mass flux estimates with 10-day temporal resolution. The approach undertaken at GSFC uses a tailored orbit estimation strategy based solely on the KBRR data. We introduce a set of temporal and spatial correlation constraints to stabilize the mass flux estimates.
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Agu Fall Meeting Abstracts, Dec 1, 2008
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Science (New York, N.Y.), Jan 28, 2016
The Orientale basin is the youngest and best-preserved major impact structure on the Moon. We use... more The Orientale basin is the youngest and best-preserved major impact structure on the Moon. We used the Gravity Recovery and Interior Laboratory (GRAIL) spacecraft to investigate the gravitational field of Orientale at 3- to 5-kilometer (km) horizontal resolution. A volume of at least (3.4 ± 0.2) × 10(6) km(3) of crustal material was removed and redistributed during basin formation. There is no preserved evidence of the transient crater that would reveal the basin's maximum volume, but its diameter may now be inferred to be between 320 and 460 km. The gravity field resolves distinctive structures of Orientale's three rings and suggests the presence of faults associated with the outer two that penetrate to the mantle. The crustal structure of Orientale provides constraints on the formation of multiring basins.
Bookmarks Related papers MentionsView impact
This paper concerns the modeling of cladding using an Nd:YAG laser operating at low powers typica... more This paper concerns the modeling of cladding using an Nd:YAG laser operating at low powers typically less than 800 W. Experimental observation of the evolution of the mass of the clads shows two power thresholds. The theoretical study relies on a calculation of the fluence provided to the substrate and on a model of heat transfer into the substrate. The
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Agu Fall Meeting Abstracts, Dec 1, 2009
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Thermosphere densities from precise orbit determination of Mars Global Surveyor (MGS), Pioneer Ve... more Thermosphere densities from precise orbit determination of Mars Global Surveyor (MGS), Pioneer Venus Orbiter (PVO), and Magellan are used with contemporaneous data from 6 Earth-orbiting satellites to investigate the responses of these planetary satellite drag environments to changes in solar flux due to the Sun's rotation. For comparative purposes, these results are cast in the form of equivalent exosphere temperature
Bookmarks Related papers MentionsView impact
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Astrodynamics 1989, 1990
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Agu Fall Meeting Abstracts, Nov 29, 2001
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Recent changes in the cryosphere highlight the importance of methods for directly observing the c... more Recent changes in the cryosphere highlight the importance of methods for directly observing the complex spatial and temporal variation of land ice mass flux. Since its launch in March of 2002, the NASA/DLR Gravity Recovery and Climate Experiment (GRACE) mission has been acquiring ultra-precise inter-satellite K-band range and range-rate (KBRR) measurements providing new observations of the complex spatial and temporal
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
We examine various approaches to gain increased temporal and spatial resolution in mass flux esti... more We examine various approaches to gain increased temporal and spatial resolution in mass flux estimates made from spherical harmonic solutions based on GRACE K-band range rate (KBRR) data. Although some of the solutions we present use standard post-solution smoothing and averaging techniques, our study focuses only on techniques applied at the solution stage (during the estimation process). The advantage of
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Agu Fall Meeting Abstracts, 2006
On multi-decadal time scales or longer, the most important processes affecting sea level are thos... more On multi-decadal time scales or longer, the most important processes affecting sea level are those associated with the mass balance over the Earth's ice sheets. The vulnerability of the cryosphere to climate change along with the difficulty in acquiring uniform in situ observations in these inhospitable regions, makes the problem of understanding ice sheet mass trends a high Earth science
Bookmarks Related papers MentionsView impact
Lunar and Planetary Science Conference, Mar 1, 1995
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Agu Fall Meeting Abstracts, Dec 1, 2006
The direct recovery of surface mass anomalies using GRACE KBRR data processed in regional solutio... more The direct recovery of surface mass anomalies using GRACE KBRR data processed in regional solutions holds great promise for producing mass flux estimates with 10-day temporal resolution. The approach undertaken at GSFC uses a tailored orbit estimation strategy based solely on the KBRR data. We introduce a set of temporal and spatial correlation constraints to stabilize the mass flux estimates.
Bookmarks Related papers MentionsView impact
Agu Fall Meeting Abstracts, Dec 1, 2008
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