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  • SPACE SCIENCES  (542)
  • 1990-1994
  • 1980-1984
  • 1970-1974  (542)
  • 1930-1934
  • 1974  (222)
  • 1973  (320)
  • 1
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    Noble gas and carbon abundances of the Havero, Dingo Pup Donga, and North Haig ureilites. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Geochimica et Cosmochimica Acta; 37; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Trapped solar and cosmogenic noble gas abundances in Apollo 15 and 16 deep drill samples (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Abundances and isotopic compositions of all the stable noble gases (He, Ne, Ar, Kr, Xe) were measured at different depths of the Apollo 15 and Apollo 16 deep drill cores, and in several surface fines and breccias. All samples analyzed from both drill cores were found to contain large concentrations of solar wind implanted gases. This means that even the deepest layers of both cores have experienced a lunar surface history. The Apollo 15 core data are consistent with a combined accretion plus static time of a few hundred million years, and also indicate variable pre-accretion irradiation of core material. Depth profiles of cosmogenic gases in the Apollo 16 core show considerably larger concentrations of cosmic gases below 65 cm depth than above. This pattern may be interpreted either as an accretionary process, or by a more recent deposition of regolith to the upper 70 cm of the core.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 21; 1, De; Dec. 197
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  • 3
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    Six-color photometry of Iapetus, Titan, Rhea, Dione and Tethys (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The extensive photometric observations of Titan, Iapetus, Rhea, Dione and Tethys have made it possible to separate the solar phase and orbital phase contributions to the observed light variations of these satellites. For Titan, the wavelength dependence of its solar phase coefficient has been obtained. This dependence should prove useful in constructing future model atmospheres. The other four satellites show a surprising array of different photometric behaviors. Despite these differences, all four satellites have similar spectral reflectivities. Clearly Iapetus, Rhea, Dione and Tethys are complex objects, varying substantially from one another in surface structure and/or composition.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-139631 , CRSR-579
    Format: application/pdf
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  • 4
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    The magnetosphere of Jupiter as observed with Pioneer 10. I - Instrument and principal findings (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Description of the first in situ observations of energetic electrons of energy greater than 0.06 MeV in the magnetosphere of Jupiter during November-December 1973. The outer magnetosphere has the form of a thin disklike quasi-trapping region extending from about 20 to over 100 Jovian radii. This magnetodisk is confined near the magnetic equatorial plane and has approximate axial symmetry about the magnetic axis of the planet. The observations inside a radial distance of 12 Jovian radii are well organized by a centered dipolar model of the planet's magnetic field with a tilt of 9.5 plus or minus 0.5 deg to the rotational axis and with pole at a system III longitude of 230 plus or minus 3 deg. Absolute omnidirectional intensities of electrons within the stable trapping region inside 20 Jovian radii are given for five energy ranges greater than 0.06, 0.55, 5.0, 21, and 31 MeV.
    Keywords: SPACE SCIENCES
    Type: AD-A000274 , Journal of Geophysical Research; 79; Sept. 1
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  • 5
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    A search for 5 min periodic structure in solar 2 cm emission (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two hundred and eighty-five hours of solar data obtained from a 2 cm radiometer during 1968-1969 were analyzed for evidence of periodic structure related to the 5 min periodic chromospheric oscillations detected in optical line emissions. A power spectral analysis of the data failed to show any statistically significant periodic activity in the frequency range 1-15 mHz for data organized according to solar activity in H-alpha, soft solar X-rays (2-12 A), and several microwave frequencies (3-15 GHz). A small shift in power from low to higher frequencies in the power spectrum of the 2 cm data was found to be correlated with H-alpha and X-ray activity. This power shift is attributed to a relative increase in chromospheric turbulence at altitudes common to H-alpha, X-ray, and 2 cm emission.
    Keywords: SPACE SCIENCES
    Type: AD-782881 , Solar Physics; 35; Mar. 197
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  • 6
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    Energetic electrons in the magnetosphere of Jupiter (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations of energetic electrons (above 7 MeV) show that the outer magnetosphere of Jupiter consists of a thin disklike, quasi-trapping region extending from about 20 to 100 planetary radii. This magnetodisk is confined to the vicinity of the magnetic equatorial plane and appears to be an approximate figure of revolution about the magnetic axis of the planet. Hard trapping is observed within a radial distance of about 20 Jovian radii. The omnidirectional intensity of electrons with energy above 21 MeV between 3 and 20 Jovian radii is described by a provisional expression in terms of radial distance and magnetic latitude. There is tentative evidence for mild effects of the Galilean satellite Europa and possibly Io and Ganymede but not Callisto.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Jan. 25
    Format: text
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  • 7
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    The lunar laser ranging experiment. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The scientific objectives achievable through high-accuracy range measurements to lunar retroreflectors are considered. A specific study of design questions related to the operation of retroreflectors on the lunar surface indicated that a reflector panel containing a number of solid fused silica corner reflectors would be capable of maintaining essentially diffraction limited performance under direct solar illumination. Initial Apollo 11 observations are discussed together with the installation of additional lunar retroreflectors in connection with the Luna 17, Apollo 14, Apollo 15, and Luna 21 missions. Range measurements at the McDonald Observatory are considered along with new results from lunar range data, and prospects regarding future lunar ranging stations.
    Keywords: SPACE SCIENCES
    Type: Science; 182; Oct. 19
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  • 8
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    Mission design for a ballistic slow-flyby of comet Encke 1980 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preliminary mission analyses for a proposed 1980 slow flyby (7 to 9 km/sec) of comet Encke are presented. Among the topics covered are: science objectives, Encke's physical activity and ephemeris accuracy, trajectory and launch-window analysis, terminal guidance, and spacecraft concepts. The nominal mission plan calls for a near-perihelion intercept with two spacecraft using a single launch vehicle. Both spacecraft arrive at the same time, one passing within 500 km from Encke's nucleus on its sunward side, the other cutting through the tail region. By applying a small propulsive correction about three weeks after the encounter, it is possible to retarget both spacecraft for a second Encke intercept in 1984. The potential science return from the ballistic slow flyby is compared with other proposed mission modes for the 1980 Encke flyby mission including the widely advocated slow flyby using solar-electric propulsion. It is shown that the ballistic slow flyby is superior in every respect.
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 74-219 , Aerospace Sciences Meeting; Jan 30, 1974 - Feb 01, 1974; Washington, DC
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  • 9
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    Nuclear microprobe analysis of solar proton implantation profiles in lunar rock surfaces (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Discussion of the results of hydrogen (proton) depth profile concentration analyses conducted on selected Apollo 16 rocks. A modeling of solar particle implantation profiles in lunar rocks is shown to trace the evolvement of these profiles under the combined influence of diffusion of atomic particles implanted in the rock, and rock surface erosion. It is also demonstrated that such diffusion may have a significant effect on the shape of the implantation profiles in certain rock materials.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
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  • 10
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    Celestial mechanics experiment (1973)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The efforts and accomplishments of the CME Team are summarized. The objectives and experiment status, gravity field of Mars, test of general relativity, and the generation of normal points are discussed.
    Keywords: SPACE SCIENCES
    Type: Mariner Mars 1971 Proj., Vol. 5; p 13-31
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