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  • LUNAR AND PLANETARY EXPLORATION  (20)
  • AERODYNAMICS  (4)
  • 1980-1984  (22)
  • 1960-1964  (2)
  • 1
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    Implications of the space effort for science and technology (1963)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Space technology, the space program, and socio- economic problems of metropolitan areas
    Keywords: AERODYNAMICS
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    NASA TECHNICAL REPORTS
  • 2
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    The case for aeolian control of meter-scale surface texture on Mars (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-06
    Description: The origin of Mars surface units and the extent of subsequent cratering play key roles in determining surface texture. At scale sizes of 0.1-10 meters, however, there is a growing body of evidence that wind is the dominant force. The direct and indirect evidence which implies that meter-scale surface texture on Mars is controlled by the wind is presented. Since radar is uniquely sensitive to structure on these scales, radio wave scattering data can provide insight on aeolian activity available from no other source.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Washington Rept. of Planetary Geology Program, 1983; p 273-275
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  • 3
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    Mars - Far-infrared spectra and thermal-emission models (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Spectra of Mars from 100 to 360 kaysers were obtained during three different observation periods from NASA's Kuiper Airborne Observatory. Also, a new thermal model was constructed for the surface of Mars, and synthetic spectra were computed from the models to compare with the observations. The models include the effects of a dusty atmosphere which absorbs, scatters, and reradiates energy. The synthetic spectra show significant effects on disk-averaged brightness temperatures, as well as absorption features due to silicate dust. The spectra of Mars, which are ratios of Mars to the moon, do not fit the synthetic spectra unless the surface emissivities of Mars and the moon have different dependencies on wavelength. A possible explanation for this behavior is a difference in soil particle-size distributions between Mars and the moon, with Mars being depleted in large particles compared to the moon. Small particles are consistent with clay minerals which have been suggested elsewhere as constituents of the Martian surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 48; Nov. 198
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  • 4
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    Saturn's pole - geometric correction based on voyager UVS and radio occultations (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Measurements of of the opacity of Saturn's rings acquired during occultation experiments at radio (3.6 cm) and ultraviolet wavelengths were initially reduced to radial position rho using a standard pole vector. Common features in the two data sets from this reduction were offset by distances Delta rho(i). These offsets have been attributed to an error in the pole direction. Because the viewing geometries were quite different for the two experiments, the set of differences of Delta rho(i) provides a sensitive measure of corrections needed to refine the Saturn pole direction. The new standard pole vector in 1950.0 coordinates has right ascension alpha = 38.409 + or - 0.016 deg and declination delta = 83.324 + or - 0.002 deg.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomical Journal (ISSN 0004-6256); 88; Oct. 198
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  • 5
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    NASA AND THE UNIVERSITIES. PRINCIPAL ADDRESSES AT THE GENERAL SESSIONS (1962)
    In:  CASI
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    Publication Date: 2019-05-11
    Description: Space exploration & space science - conference addresses
    Keywords: AERODYNAMICS
    Type: NASA-EP-5
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  • 6
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    Particle size distributions in Saturn's rings from Voyager 1 radio occultation (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Information on Saturn ring particle sizes obtained with the Voyager 1 ring occultation experiment is discussed. The theory underlying the determination of the particle size distribution is presented, including differential extinction and inversion of the scattered signal. Experimental observations and results for the observed spectra, differential cross sections, suprameter and sub- to suprameter size distributions are presented. The size and mass distributions both cut off sharply at about 4-5 m; the mass distribution peaks over the 3-4 m size range for four ring system features at 1.35, 1.51, 2.01, and 2.12 Saturn radii. A power-law type model is consistent with the data over a limited size range of 0.01 to 1 m. The fractional contribution of the suprameter particles to the microwave opacity for the four features appears to be about 1/3, 1/3, 2/3, and 1, respectively, and their cumulative surface mass per unit area are about 11, 16, 41, and 132 g/sq cm if the particles are solid water ice.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: (ISSN 0019-1035)
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  • 7
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    The microwave opacity of Saturn's rings at wavelengths of 3.6 and 13 cm from Voyager 1 radio occultation (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Information obtained about Saturn's rings through radio occultation observations with Voyager 1 is discussed. The experimental aspects are addressed, including the positional relationships and relative motions of the spacecraft, rings, and earth, the radio system, observables, microwave opacity, and diffraction. The data characteristics, reduction procedures, calibrations, and corrections are described, and results are presented for the opacity, complex extinction, and diffraction. Ring C is found to exhibit a gently undulating structure of normal opacity, except for several narrow imbedded ringlets. The normalized differential opacity indicates a substantial fraction of centimeter-size particles. In the Cassini division, the opacity appears to be nearly independent of wavelength. Ring A appears to be nearly homogeneous over much of its width, but with considerable thickening near its inner boundary with the Cassini division.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: (ISSN 0019-1035)
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  • 8
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    Pioneer 11 observations of trapped particle absorption by Amalthea (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The discovery of a microsignatury of trapped radiation in the Amalthea orbit as detected by Pioneer 11 in a flyby of Juptier in 1974 is reported and its implications for the radial diffusion coefficient in Jupiter's inner magnetosphere are discussed. A low energy telescope registered the absorption of low-energy protons as a function of the magnetic L shell durig inbound and outbound trajectories. Drift velocities of the 1 MeV particles were calculated. No correspondingly heightened effects were observed from high-energy electrons or heavier nuclei. Further analysis of the 0.5-8.7 MeV protons showed data to be consistent erosion of the particle drift shadows by a diffusion process. A limit was calculated for the highest diffusion coefficient value for the 1 MeV protons at the Amalthea orbit. The results indicate that the diffusion is driven by fluctuating electric or magnetic fields.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 88; Jan. 1
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  • 9
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    Pioneer 11 observations of trapped particle absorption by the Jovian ring and the satellites 1979, J1, J2, and J3 (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Pioneer 11 low energy telescope observation of charged particles around the Jovian satellites Amalthea, 1979 J1, J2, and J3, and the Jupiter ring are examined in the light of Voyager optical data from the same region. Good agreement was found in the absorption features of 0.5-8.7 MeV protons, electrons with energies of 3.4 MeV or more, and medium-Z nuclei. The heavier nuclei are suggested to be oxygen and sulfur particles with energies exceeding 70 MeV/nucleon. The observed intensity features in the regularly spaced radiation bands are interpreted as ring and satellite absorption.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 88; Jan. 1
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  • 10
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    The trapped radiations of Saturn and their absorption by satellites and rings (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The Pioneer 11 encounter with Saturn has revealed the existence of a fully developed magnetosphere with high-energy trapped radiation about Saturn. The present paper gives a detailed summary of the energetic charged particle measurements, including the overall characteristics of the trapped electron, proton, and helium radiation, which was found to lie inside 20 Saturn radii from the planet, and the regions extending outward to beyond the planetary bow shocks and into the interplanetary medium.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 85; Nov. 1
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