R. J. Phillips
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View article: Timing of the martian dynamo: New constraints for a core field 4.5 and 3.7 Ga ago
Timing of the martian dynamo: New constraints for a core field 4.5 and 3.7 Ga ago Open
MAVEN magnetic field data indicate that a martian dynamo field was active 4.5 and 3.7 Ga ago.
View article: Radar sounder evidence of thick, porous sediments in Meridiani Planum and implications for ice‐filled deposits on Mars
Radar sounder evidence of thick, porous sediments in Meridiani Planum and implications for ice‐filled deposits on Mars Open
Meridiani Planum is one of the most intensely studied regions on Mars, yet little is known about the physical properties of the deposits below those examined by the Opportunity rover. We report the detection of subsurface echoes within the…
View article: 3D imaging of Mars' polar ice caps using orbital radar data
3D imaging of Mars' polar ice caps using orbital radar data Open
Since its arrival in early 2006, various instruments aboard NASA's Mars Reconnaissance Orbiter (MRO) have been collecting a variety of scientific and engineering data from orbit around Mars. Among these is the Shallow Radar (SHARAD) instru…
View article: Gravity field of the Orientale basin from the Gravity Recovery and Interior Laboratory Mission
Gravity field of the Orientale basin from the Gravity Recovery and Interior Laboratory Mission Open
On the origin of Orientale basin Orientale basin is a major impact crater on the Moon, which is hard to see from Earth because it is right on the western edge of the lunar nearside. Relatively undisturbed by later events, Orientale serves …
View article: Interactions between complex craters and the lunar crust: Analysis using GRAIL data
Interactions between complex craters and the lunar crust: Analysis using GRAIL data Open
A high‐resolution gravity map over the entire lunar surface has been derived from data acquired by the Gravity Recovery and Interior Laboratory (GRAIL) mission. Soderblom et al. (2015) showed that crater Bouguer gravity anomalies scale wit…
View article: Stratigraphy and evolution of the buried CO<sub>2</sub> deposit in the Martian south polar cap
Stratigraphy and evolution of the buried CO<sub>2</sub> deposit in the Martian south polar cap Open
Observations by the Shallow Radar instrument on Mars Reconnaissance Orbiter reveal several deposits of buried CO 2 ice within the south polar layered deposits. Here we present mapping that demonstrates this unit is 18% larger than previous…
View article: MESSENGER observations of induced magnetic fields in Mercury's core
MESSENGER observations of induced magnetic fields in Mercury's core Open
Orbital data from the Magnetometer on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft allow investigation of magnetic fields induced at the top of Mercury's core by time‐varying magnetospheric field…
View article: Preimpact porosity controls the gravity signature of lunar craters
Preimpact porosity controls the gravity signature of lunar craters Open
We model the formation of lunar complex craters and investigate the effect of preimpact porosity on their gravity signatures. We find that while preimpact target porosities less than ~7% produce negative residual Bouguer anomalies (BAs), p…
View article: Lunar impact basins revealed by Gravity Recovery and Interior Laboratory measurements
Lunar impact basins revealed by Gravity Recovery and Interior Laboratory measurements Open
New gravity measurements greatly improve the Moon’s preserved impact basin inventory.
View article: First <scp>MESSENGER</scp> orbital observations of Mercury's librations
First <span>MESSENGER</span> orbital observations of Mercury's librations Open
We have coregistered laser altimeter profiles from 3 years of MErcury Surface, Space ENvironment , GEochemistry, and Ranging (MESSENGER) orbital observations with stereo digital terrain models to infer the rotation parameters for the plane…
View article: The fractured Moon: Production and saturation of porosity in the lunar highlands from impact cratering
The fractured Moon: Production and saturation of porosity in the lunar highlands from impact cratering Open
We have analyzed the Bouguer anomaly (BA) of ~1200 complex craters in the lunar highlands from Gravity Recovery and Interior Laboratory observations. The BA of these craters is generally negative, though positive BA values are observed, pa…
View article: The low‐degree shape of Mercury
The low‐degree shape of Mercury Open
The shape of Mercury, particularly when combined with its geoid, provides clues to the planet's internal structure, thermal evolution, and rotational history. Elevation measurements of the northern hemisphere acquired by the Mercury Laser …
View article: The fractured Moon: Production and saturation of porosity in the lunar highlands from impact cratering
The fractured Moon: Production and saturation of porosity in the lunar highlands from impact cratering Open
We have analyzed the Bouguer anomaly (BA) of ∼1200 complex craters in the lunar highlands from Gravity Recovery and Interior Laboratory observations. The BA of these craters is generally negative, though positive BA values are observed, pa…
View article: Effects of the passage of Comet C/2013 A1 (Siding Spring) observed by the Shallow Radar (SHARAD) on Mars Reconnaissance Orbiter
Effects of the passage of Comet C/2013 A1 (Siding Spring) observed by the Shallow Radar (SHARAD) on Mars Reconnaissance Orbiter Open
The close passage of Comet C/2013 A1 (Siding Spring) to Mars provided a unique opportunity to observe the interaction of cometary materials with the Martian ionosphere and atmosphere using the sounding radar SHARAD (SHAllow RADar) aboard M…
View article: The low‐degree shape of Mercury
The low‐degree shape of Mercury Open
The shape of Mercury, particularly when combined with its geoid, provides clues to the planet's internal structure, thermal evolution, and rotational history. Elevation measurements of the northern hemisphere acquired by the Mercury Laser …