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  • LUNAR AND PLANETARY EXPLORATION  (7)
  • Communications and Radar  (4)
  • PHYSICS, GENERAL  (1)
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  • 1
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    Spectrophotometric and color estimates of the Viking lander sites (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The spectral radiance and color of the Martian sky and soil and the spectral reflectance of soil features are estimated from six-channel (0.4-1.0 micron) spectral data obtained with the Viking lander cameras. Images taken near local noon from the two landers reveal a sky that is brighter near the horizon than the soil but with a similar spectral radiance shape and color. The scenes are predominantly moderate yellowish brown in color with only subtle variations except for some dark grey rocks. Most spectral reflectance estimates are similar: they rise rapidly with increasing wavelength between 0.4 and 0.8 micron and with only a few exceptions exhibit a pronounced minimum centered about 0.93 micron. These characteristics are consistent with an abundance of Fe(3+)-rich weathering products, notably nontronite. However, the delineation of the number and abundances of total mineral phases requires further analyses and laboratory comparisons. Reflectance estimates for rocks have not been repeatable, probably because most rocks have irregular pitted surfaces that introduce significant shadowing components.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Journal of Geophysical Research; 82; Sept. 30
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Three Mars years - Viking Lander 1 imaging observations (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The Mutch Memorial Station (Viking Lander 1) on Mars acquired imaging and meteorological data over a period of 2245 martian days (3.3 martian years). This article discusses the deposition and erosion of thin deposits (ten to hundreds of micrometers) of bright red dust associated with global dust storms, and the removal of centimeter amounts of material in selected areas during a dust storm late in the third winter. Atmospheric pressure data acquired during the period of intense erosion imply that baroclinic disturbances and strong diurnal solar tidal heating combined to produce strong winds. Erosion occurred principally in areas where soil cohesion was reduced by earlier surface sampler activities. Except for redistribution of thin layers of materials, the surface appears to be remarkably stable, perhaps because of cohension of the undisturbed surface material.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Science (ISSN 0036-8075); 222; 463-468
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Titan's Surface from Cassini RADAR SAR and High Resolution Radiometry Data of the First Five Flybys (2007)
    In:  Other Sources
    Details
    Publikationsdatum: 2018-06-11
    Beschreibung: The first five Titan flybys with Cassini's Synthetic Aperture RADAR (SAR) and radiometer are examined with emphasis on the calibration and interpretation of the high-resolution radiometry data acquired during the SAR mode (SAR-radiometry). Maps of the 2-cm wavelength brightness temperature are obtained coincident with the SAR swath imaging, with spatial resolution approaching 6 km. A preliminary calibration shows that brightness temperature in these maps varies from 64 to 89 K. Surface features and physical properties derived from the SAR-radiometry maps and SAR imaging are strongly correlated; in general, we find that surface features with high radar reflectivity are associated with radiometrically cold regions, while surface features with low radar reflectivity correlate with radiometrically warm regions. We examined scatterplots of the normalized radar cross-section sigma(exp o) versus brightness temperature, finding differing signatures that characterize various terrains and surface features. Implications for the physical and compositional properties of these features are discussed. The results indicate that volume scattering is important in many areas of Titan's surface, particularly Xanadu, while other areas exhibit complex brightness temperature variations consistent with variable slopes or surface material and compositional properties.
    Schlagwort(e): Communications and Radar
    Materialart: Icarus; Volume 191; No. 1; 211-222
    Format: text
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  • 4
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    Cassini RADAR's First Look at Titan (2005)
    In:  CASI
    Details
    Publikationsdatum: 2017-10-02
    Beschreibung: The Cassini Titan RADAR Mapper [1] is a Ku-band (13.78 GHz,lambda = 2.17 cm) linear polarized RADAR instrument capable of operating in synthetic aperture (SAR), scatterometer, altimeter and radiometer modes. Radar observations on Titan passes Ta and T3 included rastered scatterometry, SAR, altimetry and rastered radiometry images of a full hemisphere in orthogonal linear polarizations. At this writing only the Ta data have been acquired, but data from both passes will be discussed in the presentation.
    Schlagwort(e): Communications and Radar
    Materialart: Lunar and Planetary Science XXXVI, Part 5; LPI-Contrib-1234-Pt-5
    Format: application/pdf
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  • 5
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    Use of Radar Backscatter to Infer Aerodynamic Roughness (1995)
    In:  Other Sources
    Details
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Communications and Radar
    Materialart: IGARSS '95; Florence; Italy
    Format: text
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  • 6
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    Analysis of condensates formed at the Viking 2 lander site - The first winter (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Relative surface albedo, spectral reflectance estimates and a limited photometric function are reduced from Viking 2 lander data obtained during a 249 Mars day period, in the lander's first year, when a light ground covering appeared on the surface. During the deposition, surface broadband albedo more than doubled and blue reflectance increased by a factor of 4.0. Comparison of lander data with earlier laboratory measurements of CO2 and H2O frosts and snows shows that reflectance estimates do not resemble either of those solids. The condensate reflectance resembles that of the surface after the covering disappeared. The covering may have been colored by dust which fell before it, by dust mixed with it, or by dust on top of it; but the data strongly support a mixture of dust with H2O and CO2 solids. The covering thickness is estimated to be between 0.5 and a few millimeters.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Icarus; 47; Aug. 198
    Format: text
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  • 7
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    Viking lander imaging investigation during extended and continuation automatic missions. Volume 1: Lander 1 picture catalog of experiment data record (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: All images returned by Viking Lander 1 during the extended and continuation automatic phases of the Viking Mission are presented. Listings of supplemental information which describe the conditions under which the images were acquired are included together with skyline drawings which show where the images are positioned in the field of view of the cameras. Subsets of the images are listed in a variety of sequences to aid in locating images of interest. The format and organization of the digital magnetic tape storage of the images are described as well as the mission and the camera system.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-RP-1068 , L-14054-VOL-1
    Format: application/pdf
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  • 8
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    Viking lander imaging investigation during extended and continuation automatic missions. Volume 2: Lander 2 picture catalog of experiment data record (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Images returned by the two Viking landers during the extended and continuation automatic phases of the Viking Mission are presented. Information describing the conditions under which the images were acquired is included with skyline drawings showing the images positioned in the field of view of the cameras. Subsets of the images are listed in a variety of sequences to aid in locating images of interest. The format and organization of the digital magnetic tape storage of the images are described. A brief description of the mission and the camera system is also included.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-RP-1068-VOL-2 , L-14054
    Format: application/pdf
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  • 9
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    One Mars year - Viking lander imaging observations (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The imaging systems on board the two Viking landers have documented eolian processes and condensate formation on the Martian surface during the first Mars year of operation. During the winter, the formation of what appeared to be solid H2O and CO2 at the Viking 2 lander site was noted. The condensate formation suggested that solar radiative heating dominates atmospheric conductive heating on Mars. In addition, the Viking observations indicated that Martian surface erosion due to dust distribution may be lower than previously thought.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Science; 204; May 25
    Format: text
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  • 10
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    Conclusion of Viking Lander Imaging Investigation: Picture catalog of experiment data record (1985)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The images returned by the two Viking landers during the Viking Survey Mission are presented in this report. Listing of supplemental information which describe the conditions under which the images were acquired are included. Subsets of the images are listed in a variety of sequences to aid in locating images of interest. The format and organization of the digital magnetic tape storage of the images are described. A brief description of the mission and the camera system is also included.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-RP-1137 , L-15925 , NAS 1.61:1137
    Format: application/pdf
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