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  • Other Sources  (435)
  • Geophysics  (343)
  • LUNAR AND PLANETARY EXPLORATION  (59)
  • INSTRUMENTATION AND PHOTOGRAPHY  (18)
  • OCEANOGRAPHY  (15)
  • 1
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    The imaging photopolarimeter experiment on Pioneer 11 (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: For 2 weeks continuous imaging, photometry, and polarimetry observations were made of Jupiter and the Galilean satellites in red and blue light from Pioneer 11. Measurements of Jupiter's north and south polar regions were possible because the spacecraft trajectory was highly inclined to the planet's equatorial plane. One of the highest resolution images obtained is presented here along with a comparison of a sample of our photometric and polarimetric data with a simple model. The data seem consistent with increased molecular scattering at high latitudes.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 188; May 2
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  • 2
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    Improvements in Ross type astrometric objectives (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: It is shown that aspheric deformations of the first and fourth elements of the four element Ross objective can be introduced to permit one to obtain improved color corrections for astrometric purposes. The usual monochromatic aberrations are as well corrected as for the standard Ross lens. In addition, one can eliminate or reduce additional aberrations, such as secondary spectrum, chromatic spherical aberration, chromatic coma and chromatic distortion. The resulting objectives are suitable for use as intermediate and long focus astrometric objectives covering large angle fields.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Univ. of South Fla. Conf. on Phot. Astrometric Technique; p 61-84
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  • 3
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    Marine research using data from TOPEX/Poseidon (1991)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: The Proudman Oceanographic Laboratory (POL), the Institute of Oceanographic Sciences Deacon Laboratory (IOSDL), and the British National Space Centre (BNSC) plan to use radar altimeter data from the TOPEX/POSEIDON mission in five main areas of research. These are: (1) investigation of variations in Southern Ocean sea levels and circulation; (2) related numerical modeling and data assimilation; (3) global and regional ocean tides; (4) North Sea and northeast Atlantic studies; and (5) winds and waves. Each one of these topics is described briefly below while more information can be extracted from the United Kingdom response to the TOPEX/POSEIDON Announcement of Opportunity.
    Keywords: OCEANOGRAPHY
    Type: JPL, TOPEX(Poseidon Science Investigations Plan; p 169-173
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  • 4
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    'Oxide-free' tip for scanning tunneling microscopy (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A new tip for scanning tunneling microscopy and a tip repair procedure that allows one to reproducibly obtain atomic images of highly oriented pyrolytic graphite with previously inoperable tips are reported. The tips are shown to be relatively oxide-free and highly resistant to oxidation. The tips are fabricated with graphite by two distinct methods.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Physics Letters (ISSN 0003-6951); 51; 305-307
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  • 5
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    A model of impulsive acceleration and transport of energetic particles in Mercury's magnetosphere (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A qualitative model of substorm processes in the Mercury magnetosphere is presented based on Mariner 10 observations obtained in 1974-1975. The model is predicated on close analogies observed with the terrestrial case. Particular emphasis is given to energetic particle phenomena as observed by Mariner on March 29, 1974. The suggestion is supported that energetic particles up to about 500 keV are produced by strong induced electric fields at 3 to about 6 Mercury radii in the Hermean tail in association with substorm neutral line formation. The bursts of energetic particles produced are, in this model, subsequently confined on closed field lines near Mercury and drift adiabatically on quasi-trapped orbits for many tens of seconds. Such gradient and curvature drift of the particles can explain prominent periodicities of 5-10 s seen in the Mariner for greater than 170-keV electron flux profiles.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 8742-874
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  • 6
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    Radio-interferometric imaging of the subsurface emissions from the planet Mercury (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The distribution of total and polarized intensities from Mercury's subsurface layers have been mapped using VLA observations. The first detection of a hot pole along the Hermean equator is reported and modeled as black-body reradiation from preferential diurnal heating. These observations appear to rule out any internal sources of heat within Mercury. Polarized emission from the limb of the planet is also found, and is understood in terms of the dielectric properties of the Hermean surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 329; 224-226
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  • 7
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    Fluvial valleys and Martian palaeoclimates (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Theoretical models of early Martian atmospheric evolution describe the maintenance of a dense CO2 atmosphere and a warm, wet climate until the end of the heavy-bombardment phase of impacting. However, the presence of very young, earthlike fluvial valleys on the northern flank of Alba Patera conflicts with this scenario. Whereas the widespread ancient Martian valleys generally have morphologies indicative of sapping erosion by the slow outflow of subsurface water, the local Alba valleys were probably formed by surface-runoff processes. Because subsurface water flow might be maintained by hydrothermal energy inputs and because surface-runoff valleys developed late in Martian history, it is not necessary to invoke drastically different planet-wide climatic conditions to explain valley development on Mars. The Alba fluvial valleys can be explained by hydrothermal activity or outflow-channel discharges that locally modified the atmosphere, including precipitation and local overland flow on low-permeability volcanic ash.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 341; 514-516
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  • 8
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    Aircraft and satellite measurement of ocean wave directional spectra using scanning-beam microwave radars (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A microwave radar technique for remotely measuring the vector wave number spectrum of the ocean surface is described. The technique which employs short-pulse, noncoherent radars in a conical scan mode near vertical incidence, is shown to be suitable for both aircraft and satellite application, the technique was validated at 10 km aircraft altitude, where we have found excellent agreement between buoy and radar-inferred absolute wave height spectra.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 987-1004
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  • 9
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    Channels and valleys on Mars (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Tentative conclusions about the origins of channels and valleys on Mars based on the consensus of investigators who have studied the problem are presented. The morphology of outflow channels is described in detail, and the morphology, distribution, and genesis of Martian valleys are addressed. Secondary modification of channels and valleys by mass-wasting phenomena, eolian processes, cratering, and mantling by lava flows is discussed. The physics of the flows needed to account for the immense volumes of Martian outflow channels is considered in detail, including the possible influence of debris flows and mudflows, glaciers, and ice sheets. It is concluded that Mars once probably possessed an atmosphere with higher temperatures and pressures than at present which played an essential role in an active hydrological cycle.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geological Society of America, Bulletin (ISSN 0016-7606); 94; 1035-105
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  • 10
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    Microwave measurement of the electron density profile in a supersonic arc jet (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Microwave probe for measuring electron density profile in supersonic arc jet plasma
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; 17 (
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