Publications
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Geology and Surface Processes on Titan Geology and Surface Processes on Titan
The surface of Titan has been revealed globally, if incompletely, by Cassini observations at infrared and radar wavelengths as well as locally by the instruments on the Huygens probe. Extended dune fields, lakes, mountainous terrain, dendritic erosion patterns and erosional remnants indicate dynamic surface processes. Valleys, small-scale gullies and rounded cobbles such as those...
Authors
Ralf Jaumann, Randolph L. Kirk, Ralph D. Lorenz, Rosaly Lopes, Ellen Stofan, Elizabeth P. Turtle, Horst Uwe Keller, Charles A. Wood, Christophe Sotin, Laurence A. Soderblom, Martin G. Tomasko
The imaging performance of the SRC on Mars Express The imaging performance of the SRC on Mars Express
The Mars Express spacecraft carries the pushbroom scanner high-resolution stereo camera (HRSC) and its added imaging subsystem super resolution channel (SRC). The SRC is equipped with its own optical system and a 1024×1024 framing sensor. SRC produces snapshots with 2.3 m ground pixel size from the nominal spacecraft pericenter height of 250 km, which are typically embedded in the...
Authors
J. Oberst, G. Schwarz, T. Behnke, H. Hoffmann, K.-D. Matz, J. Flohrer, H. Hirsch, T. Roatsch, F. Scholten, E. Hauber, B. Brinkmann, R. Jaumann, D. Williams, Randolph L. Kirk, T. Duxbury, C. Leu, G. Neukum
Dependence of displacement-length scaling relations for fractures and deformation bands on the volumetric changes across them Dependence of displacement-length scaling relations for fractures and deformation bands on the volumetric changes across them
Displacement–length data from faults, joints, veins, igneous dikes, shear deformation bands, and compaction bands define two groups. The first group, having a power-law scaling relation with a slope of n = 1 and therefore a linear dependence of maximum displacement and discontinuity length (Dmax = γL), comprises faults and shear (non-compactional or non-dilational) deformation bands...
Authors
Richard A. Schultz, Roger Soliva, Haakon Fossen, Chris Okubo, Donald M. Reeves
Dunes on Titan observed by Cassini Radar Dunes on Titan observed by Cassini Radar
Thousands of longitudinal dunes have recently been discovered by the Titan Radar Mapper on the surface of Titan. These are found mainly within ±30° of the equator in optically-, near-infrared-, and radar-dark regions, indicating a strong proportion of organics, and cover well over 5% of Titan's surface. Their longitudinal duneform, interactions with topography, and correlation with other...
Authors
J. Radebaugh, R. D. Lorenz, J. I. Lunine, S. D. Wall, G. Boubin, E. Reffet, Randolph L. Kirk, R.M. Lopes, E. R. Stofan, Laurence A. Soderblom, M. Allison, M. Janssen, P. Paillou, P. Callahan, Carl Spencer
Titan's diverse landscapes as evidenced by Cassini RADAR's third and fourth looks at Titan Titan's diverse landscapes as evidenced by Cassini RADAR's third and fourth looks at Titan
Cassini's third and fourth radar flybys, T7 and T8, covered diverse terrains in the high southern and equatorial latitudes, respectively. The T7 synthetic aperture radar (SAR) swath is somewhat more straightforward to understand in terms of a progressive poleward descent from a high, dissected, and partly hilly terrain down to a low flat plain with embayments and deposits suggestive of...
Authors
J. I. Lunine, C. Elachi, S. D. Wall, M.A. Janssen, M.D. Allison, Y. Anderson, R. Boehmer, P. Callahan, P. Encrenaz, E. Flamini, G. Franceschetti, Y. Gim, G. Hamilton, S. Hensley, W.T.K. Johnson, K. Kelleher, Randolph L. Kirk, R.M. Lopes, R. Lorenz, D.O. Muhleman, R. Orosei, S.J. Ostro, F. Paganelli, P. Paillou, G. Picardi, F. Posa, J. Radebaugh, L.E. Roth, R. Seu, S. Shaffer, Laurence A. Soderblom, B. Stiles, E. R. Stofan, S. Vetrella, R. West, C. A. Wood, L. Wye, H. Zebker, G. Alberti, E. Karkoschka, B. Rizk, E. McFarlane, C. See, B. Kazeminejad
Correlation of the Deccan and Rajahmundry Trap lavas: Are these the longest and largest lava flows on Earth? Correlation of the Deccan and Rajahmundry Trap lavas: Are these the longest and largest lava flows on Earth?
We propose that the Rajahmundry Trap lavas, found near the east coast of peninsular India,are remnants of the longest lava flows yet recognized on Earth (∼ 1000 km long). These outlying Deccan-like lavas are shown to belong to the main Deccan Traps. Several previous studies have already suggested this correlation, but have not demonstrated it categorically. The exposed Rajahmundry lavas...
Authors
Stephen Self, Anne E. Jay, Michael Widdowson, Laszlo P. Keszthelyi
Quasi-periodic bedding in the sedimentary rock record of mars Quasi-periodic bedding in the sedimentary rock record of mars
Widespread sedimentary rocks on Mars preserve evidence of surface conditions different from the modern cold and dry environment, although it is unknown how long conditions favorable to deposition persisted. We used 1-meter stereo topographic maps to demonstrate the presence of rhythmic bedding at several outcrops in the Arabia Terra region. Repeating beds are ∼10 meters thick, and one...
Authors
Kevin W. Lewis, Oded Aharonson, John P. Grotzinger, Randolph L. Kirk, Alfred S. McEwen, Terry-Ann Suer
Seasonally active frost-dust avalanches on a north polar scarp of Mars captured by HiRISE Seasonally active frost-dust avalanches on a north polar scarp of Mars captured by HiRISE
North-polar temporal monitoring by the High Resolution Imaging Science Experiment (HiRISE) orbiting Mars has discovered new, dramatic examples that Mars1 CO2-dominated seasonal volatile cycle is not limited to quiet deposition and sublimation of frost. In early northern martian spring, 2008, HiRISE captured several cases of CO2 frost and dust cascading down a steep, polar scarp in...
Authors
Patrick S. Russell, Nicolas Thomas, Shane Byrne, Kenneth E. Herkenhoff, Kathryn E. Fishbaugh, Nathan Bridges, Chris Okubo, Moses P. Milazzo, Ingrid J. Daubar, Candice J. Hansen, Alfred S. McEwen
High Resolution Imaging Science Experiment (HiRISE) observations of glacial and periglacial morphologies in the circum-Argyre Planitia highlands, Mars High Resolution Imaging Science Experiment (HiRISE) observations of glacial and periglacial morphologies in the circum-Argyre Planitia highlands, Mars
The landscape of the Argyre Planitia and adjoining Charitum and Nereidum Montes in the southern hemisphere of Mars has been heavily modified since formation of the Argyre impact basin. This study examines morphologies in the Argyre region revealed in images acquired by the High Resolution Imaging Science Experiment (HiRISE) camera and discusses the implications for glacial and...
Authors
Maria E. Banks, Alfred S. McEwen, Jeffrey S. Kargel, Victor R. Baker, Robert G. Strom, Michael T. Mellon, Virginia C. Gulick, Laszlo P. Keszthelyi, Kenneth E. Herkenhoff, Jon D. Pelletier, Windy L. Jaeger
Hematite spherules at Meridiani: results from MI, Mini-TES, and Pancam Hematite spherules at Meridiani: results from MI, Mini-TES, and Pancam
We report on observations of hematite‐bearing spherules at Meridiani Planum made using the Microscopic Imager (MI), Mini‐Thermal Emission Spectrometer (Mini‐TES), and Panoramic Camera (Pancam) instruments on the Mars Exploration Rover Opportunity. Spherules were observed on soil surfaces and in outcrop rocks, both on undisturbed surfaces and in abraded surfaces ground using the Rock...
Authors
W. M. Calvin, J.D. Shoffner, J. R. Johnson, A.H. Knoll, J.M. Pocock, S. W. Squyres, C.M. Weitz, R. E. Arvidson, J.F. Bell, P. R. Christensen, P. A. de Souza, W. H. Farrand, T.D. Glotch, Kenneth E. Herkenhoff, B.L. Jolliff, A.T. Knudson, S. M. McLennan, A.D. Rogers, S.D. Thompson
Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars
Phyllosilicates have previously been detected in layered outcrops in and around the Martian outflow channel Mawrth Vallis. CRISM spectra of these outcrops exhibit features diagnostic of kaolinite, montmorillonite, and Fe/Mg-rich smectites, along with crystalline ferric oxide minerals such as hematite. These minerals occur in distinct stratigraphic horizons, implying changing...
Authors
J.J. Wray, B.L. Ehlmann, S. W. Squyres, J.F. Mustard, Randolph L. Kirk
On developing thermal cave detection techniques for earth, the moon and mars On developing thermal cave detection techniques for earth, the moon and mars
The purpose of this study is to (1) demonstrate the viability of detecting terrestrial caves at thermal-infrared wavelengths, (2) improve our understanding of terrestrial cave thermal behavior, (3) identify times of day when cave openings have the maximum thermal contrast with the surrounding surface regolith, and (4) further our understanding of how to detect caves on Earth, the Moon...
Authors
J. Judson Wynne, Timothy N. Titus, Guillermo Chong Diaz