B. A. Campbell
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View article: High Frequency Radar Perspective of Putative Subglacial Liquid Water on Mars
High Frequency Radar Perspective of Putative Subglacial Liquid Water on Mars Open
Anomalously bright radar reflections from the base of Mars' south polar cap raise the tantalizing possibility of present‐day liquid water. Orosei et al. (2018, https://doi.org/10.1126/science.aar7268 ) first reported bright subsurface echo…
View article: Surface Properties of Sediments at the 2014–2015 Holuhraun Lava Flow-field: Insights from Multiwavelength Radar
Surface Properties of Sediments at the 2014–2015 Holuhraun Lava Flow-field: Insights from Multiwavelength Radar Open
Redistribution of sediments can lead to mantling of geologic features. This can obscure the original texture of lava flows, making it difficult to understand their emplacement conditions based on remote sensing data alone. In situ data acq…
View article: Seasonal CO<sub>2</sub> Cycle at the Martian Poles Revealed by Sounding Radar
Seasonal CO<sub>2</sub> Cycle at the Martian Poles Revealed by Sounding Radar Open
Seasonal CO 2 frost accumulates and ablates at the Martian poles during night and day, respectively. We report the first robust measurements of polar seasonal change in SHAllow RADar (SHARAD) data, based on calibration of the 16‐year data …
View article: Unveiling Lunar Volcanic Complexity Beyond the Procellarum Kreep Terrane
Unveiling Lunar Volcanic Complexity Beyond the Procellarum Kreep Terrane Open
Motivation: The prevailing explanation for the dramatic asymmetry in lunar volcanism is that the Procellarum KREEP Terrane (PKT) represents a unique lunar province hosting a shallow reservoir of heat-producing elements. But is the story mo…
View article: SHARAD Illuminates Deeper Martian Subsurface Structures with a Boost from Very Large Rolls of the MRO Spacecraft
SHARAD Illuminates Deeper Martian Subsurface Structures with a Boost from Very Large Rolls of the MRO Spacecraft Open
Throughout its mission, the Mars Reconnaissance Orbiter (MRO) has often rolled about its along-track axis by up to 28° to partially compensate for the suboptimal location of the Shallow Radar (SHARAD) antenna along an edge of the spacecraf…
View article: Mapping of Western Valles Marineris Light‐Toned Layered Deposits and Newly Classified Rim Deposits
Mapping of Western Valles Marineris Light‐Toned Layered Deposits and Newly Classified Rim Deposits Open
Layered deposits are found on the plateaus surrounding the western portion of Valles Marineris, mantling the chasmata rims. These rim deposits exhibit intricate layering and are described as light‐toned layered deposits (LLDs) in previous …
View article: Radar for Europa Assessment and Sounding: Ocean to Near-Surface (REASON)
Radar for Europa Assessment and Sounding: Ocean to Near-Surface (REASON) Open
The Radar for Europa Assessment and Sounding: Ocean to Near-surface (REASON) is a dual-frequency ice-penetrating radar (9 and 60 MHz) onboard the Europa Clipper mission. REASON is designed to probe Europa from exosphere to subsurface ocean…
View article: Recent Widespread Deposition in the Martian North and South Polar Layered Deposits as Revealed by Multiband SHARAD Surface Reflectivity
Recent Widespread Deposition in the Martian North and South Polar Layered Deposits as Revealed by Multiband SHARAD Surface Reflectivity Open
The north and south polar layered deposits (PLD) on Mars are composed of stacks of layered ice and dust, but the SPLD is approximately twice as bright as the NPLD in 20‐MHz radar echoes. We use Shallow Radar (SHARAD) data in ∼4‐MHz bands c…
View article: SHARAD Mapping of Mars Dayside Ionosphere Patterns: Relationship to Regional Geology and the Magnetic Field
SHARAD Mapping of Mars Dayside Ionosphere Patterns: Relationship to Regional Geology and the Magnetic Field Open
The electron density of the Martian ionosphere is modulated by solar wind forcing and crustal magnetic fields. Sounding observations from the orbital Shallow Radar (SHARAD) map the ionospheric total electron content (TEC) at a spatial reso…
View article: Evidence of Ice-Rich Layered Deposits in the Medusae Fossae Formation of Mars
Evidence of Ice-Rich Layered Deposits in the Medusae Fossae Formation of Mars Open
• MARSIS radar sounder data reveals layering in the Medusae Fossae Formation deposits. • Layers are likely due to transitions between mixtures of ice-rich and ice-poor dust, analogous to those in Polar Layered Deposits. • An ice-rich porti…
View article: Evidence of Ice‐Rich Layered Deposits in the Medusae Fossae Formation of Mars
Evidence of Ice‐Rich Layered Deposits in the Medusae Fossae Formation of Mars Open
Subsurface reflectors in radar sounder data from the Mars Advanced Radar for Subsurface and Ionospheric Sounding instrument aboard the Mars Express spacecraft indicate significant dielectric contrasts between layers in the Martian Medusae …
View article: Radar Perspective of the Aristarchus Pyroclastic Deposit and Implications for Future Missions
Radar Perspective of the Aristarchus Pyroclastic Deposit and Implications for Future Missions Open
The Aristarchus plateau represents one of the most complex volcanic provinces on the lunar surface and is host to the largest pyroclastic deposit on the Moon. Lunar pyroclastic deposits offer a window into the Moon’s interior and represent…
View article: Three-dimensional imaging of martian glaciated terrain using Mars Reconnaissance Orbiter Shallow Radar (SHARAD) observations
Three-dimensional imaging of martian glaciated terrain using Mars Reconnaissance Orbiter Shallow Radar (SHARAD) observations Open
We present a three-dimensional radargram of a 13° x 11° region of Deuteronilus Mensae, produced from 457 Mars Reconnaissance Orbiter Shallow Radar (SHARAD) observations. We assess the viability of the 3D imaging algorithms developed to wor…
View article: Science results from sixteen years of MRO SHARAD operations
Science results from sixteen years of MRO SHARAD operations Open
View article: Tesserae: Surface differences across Venus’s “continents”
Tesserae: Surface differences across Venus’s “continents” Open
The heavily deformed upland tesserae are some of the most ancient geologic units on Venus and, as such, record the longest history of surface evolution. Our geologic understanding of these landforms is based largely on radar images from th…
View article: Supplemental Material: Tesserae: Surface differences across Venus’s “continents”
Supplemental Material: Tesserae: Surface differences across Venus’s “continents” Open
More methodological details, as well as the results and details about surface modification properties in the form of supplemental text, figures, and tables.
View article: Supplemental Material: Tesserae: Surface differences across Venus’s “continents”
Supplemental Material: Tesserae: Surface differences across Venus’s “continents” Open
More methodological details, as well as the results and details about surface modification properties in the form of supplemental text, figures, and tables.
View article: Dynamic development of the Athabasca Valles outflow system from volcanic facies and 15 m scale roughness
Dynamic development of the Athabasca Valles outflow system from volcanic facies and 15 m scale roughness Open
Surface roughness properties provide context for geologic terrains, and are commonly partnered with field-based mapping on Earth and satellite-based photogeologic mapping in planetary sciences. In this study, we combine morphology-based fa…
View article: New Views of the Internal Structure of Planum Boreum from Enhanced 3D Imaging of Mars Reconnaissance Orbiter Shallow Radar Data
New Views of the Internal Structure of Planum Boreum from Enhanced 3D Imaging of Mars Reconnaissance Orbiter Shallow Radar Data Open
We present first results from a new 3D radargram produced from 3399 Mars Reconnaissance Orbiter (MRO) Shallow Radar observations of the north polar region of Mars. While incorporating an additional 5 yr of observations relative to the prio…
View article: Investigating the Martian Surface at Decametric Scale: Population, Distribution, and Dimension of Heterogeneity from Radar Statistics
Investigating the Martian Surface at Decametric Scale: Population, Distribution, and Dimension of Heterogeneity from Radar Statistics Open
Building on one decade of theory and methodology maturation, we investigate the coherent and incoherent components of the response of the Martian surface to nadir-looking orbital radar. We apply a reflectometry technique known as radar sta…
View article: EnVision: understanding why our closest neighbour is so different&#160;
EnVision: understanding why our closest neighbour is so different  Open
<p> </p> <p>EnVision was selected as ESA's 5th Medium-class mission in the Agency's Cosmic Vision plan, targeting a launch in the early 2030s. EnVision's overarching science questions are to explore the full rang…
View article: VERITAS Radar Observations at Venus
VERITAS Radar Observations at Venus Open
<p>VERITAS is a NASA Discovery mission that was selected on June 2, 2021 and is a partnership between scientists and engineers at NASA/JPL and with the German (DLR), Italian (ASI) and French Space Agencies (CNES). VERITAS would carry…
View article: The Lateral Continuity and Vertical Arrangement of Dust Layers in the Martian North Polar Cap From SHARAD Multiband Data
The Lateral Continuity and Vertical Arrangement of Dust Layers in the Martian North Polar Cap From SHARAD Multiband Data Open
Interpretation of radar sounder reflections to infer the structure and composition of the martian polar caps depends on whether bright returns correspond to single packed dust layers or a more finely layered structure. Reflections from mul…
View article: Publisher Correction: Reporting guideline for the early-stage clinical evaluation of decision support systems driven by artificial intelligence: DECIDE-AI
Publisher Correction: Reporting guideline for the early-stage clinical evaluation of decision support systems driven by artificial intelligence: DECIDE-AI Open
View article: Revealing the Mysteries of Venus: The DAVINCI Mission
Revealing the Mysteries of Venus: The DAVINCI Mission Open
The Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging (DAVINCI) mission described herein has been selected for flight to Venus as part of the NASA Discovery Program. DAVINCI will be the first mission to Venus to in…
View article: Crater Ejecta Across Maxwell Montes, Venus, and Possible Effects on Future Rock Type Measurements
Crater Ejecta Across Maxwell Montes, Venus, and Possible Effects on Future Rock Type Measurements Open
Venus highlands such as Maxwell Montes are an exploration target in the search for a past water‐rich environment. We combine Magellan and Arecibo radar data to characterize surface properties across Maxwell for orbital or landed investigat…
View article: The EnVision Mission to Venus
The EnVision Mission to Venus Open
<p>On June 10, 2021, the European Space Agency (ESA) announced the selection of EnVision as its newest medium-class science mission. EnVision's overarching science questions are to explore the full range of geoscientific processes op…
View article: Roughness Variations in Venus Tesserae: Influence of Crater Ejecta and Inherent Differences in Surface Morphology
Roughness Variations in Venus Tesserae: Influence of Crater Ejecta and Inherent Differences in Surface Morphology Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Geophysical Research Letters. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn mo…
View article: Arecibo Radar Maps of Venus from 1988 to 2020
Arecibo Radar Maps of Venus from 1988 to 2020 Open
Over its 57 yr history, the Arecibo telescope was used to produce radar maps of Venus that pioneered our understanding of surface landforms and geologic processes. The best spatial resolution of 1–2 km achievable with the S -band (2380 MHz…
View article: The Impact of Energetic Particles on the Martian Ionosphere During a Full Solar Cycle of Radar Observations: Radar Blackouts
The Impact of Energetic Particles on the Martian Ionosphere During a Full Solar Cycle of Radar Observations: Radar Blackouts Open
We present the first long‐term characterization of ionization layers in the lower ionosphere of Mars (below ∼90 km), a region inaccessible to orbital in‐situ observations, based on an analysis of radar echo blackouts observed on Mars Expre…