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  • LUNAR AND PLANETARY EXPLORATION  (9)
  • AIR TRANSPORTATION AND SAFETY  (5)
  • 1985-1989  (14)
  • 1955-1959
  • 1
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Voyager 2 radio science observations of the Uranian system Atmosphere, rings, and satellites (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The results of preliminary analyses of radio occultation data obtained by Voyager 2 as it passed Uranus are described. The occultations took place between 2-7 deg S latitude and yielded atmospheric temperature profiles between pressure levels of 10-900 mbar, an altitude range of 100 km. The mole fractions of hydrogen and helium in the tropopause were estimated, in conjunction with IR data, to about 0.85 and 0.10-0.20, respectively. Radio signal intensity data indicated the presence of a cloud deck of CH4 ice at a pressure level of 1300 mbar and a temperature of 81 K, implying a CH4 mole fraction of 0.02 at very low altitudes. The ionosphere extended upward, in two levels, to more than 10,000 km altitude. The ring system was different than the one around Saturn and possessed cylindrical substructures. The radio data also permitted mass density estimates for the five major moons, i.e., about 1.40 gr/cu cm, a value which rules out cometary origins.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 233; 79-84
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Investigation of air transportation technology at Massachusetts Institute of Technology, 1986 (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: There were three areas of research sponsored in the Flight Transportation Lab. at MIT under the Joint University Research Program during 1986. The first was the completion of efforts investigating the possibility of using Loran-C for final approach guidance to a runway; the second is a preliminary exploration of the application of automated speech recognition in Air Traffic Control; the third is a continuation of a series of research topics into aircraft icing problems.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA, Langley Research Center, Joint University Program for Air Transportation Research, 1986; p 3-6
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Investigation of air transport technology at Massachusetts Institute of Technology, 1983 (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The limitations in providing both centerline and altitude guidance for runways in good Loran-C signal coverage were determined. The high data rate (10/sec) and good repeatable accuracy of Loran-C indicate that it will be possible to provide the pilot with continuous, cross pointer display of guidance information similar to that provided by ILS/MLS, at least when good signal-to-noise ratios and good geometry from Loran-C Lines of Position (LOP) exist at the airport.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA Langley Research Center Joint University Program for Air Transportation Research, 1983; p 3-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Uranus - Beneath that bland exterior (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Findings made by the Voyager missions regarding the atmosphere, magnetic field, rings, and satellites of Uranus are reviewed. The reasons for the bland appearance of the planet are addressed, and the use of radio and infrared instruments to determine the rotational speeds of the planet and atmosphere, the equatorial radius, and the atmospheric temperature is discussed. The corkscrew magnetic field and the dark, almost dust-free rings are described. The most significant features of the largest Uranian moons are mentioned.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Planetary Report (ISSN 0736-3680); 9; 16-18
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Investigation of air transportation technology at Massachusetts Institute of Technology, 1985 (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Two areas of research are discussed, an investigation into runway approach flying with Loran C and a series of research topics in the development of experimental validation of methodologies to support aircraft icing analysis. Flight tests with the Loran C led to the conclusion that it is a suitable system for non-precision approaches, and that time-difference corrections made every eight weeks in the instrument approach plates will produce acceptable errors. In the area of aircraft icing analysis, wind tunnel and flight test results are discussed.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA, Langley Research Center, Joint University Program for Air Transportation Research, 1985; p 3-6
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Investigation of air transportation technology at Massachusetts Institute of Technology, 1984 (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Three projects sponsored by the Joint University Program at MIT are summarized. Two projects were focussed on the potential application of Loran-C in flying nonprecision approaches to general aviation runways, and the third project involved research on aircraft icing. In one Loran-C project, Aircraft Approach Guidance Using Relative Loran-C Navigation, the concept was flight tested. It used the difference in TD's from those of the touchdown point to simplify and speed navigation computer processing and took advantage of the short term accuracy of less than 100 feet for Loran-C. The goal of the project, Probabilistic Modelling of Loran-C Error for Nonprecision Approaches, was to develop a mathematical model which would predict the probability that an approach flown to a runway with a particular Loran-C receiver would fall within a given standard. The Aircraft Icing project focussed on measurement of droplet trajectories and droplet impingement/runback characteristics and measurement of real time ice accretion using ultrasonic pulse echo techniques.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA. Langley Research Center Joint University Program for Air Transportation Research, 1984; p 3-7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Statistics of Aeolian Surface of Mars (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-09
    Description: Aeolian control of large scale surface texture is apparent in orbiter images from selected regions of Mars -- the polar areas, equatorial canyons, and some craters. At other locations on Mars there is evidence suggesting aeolian control on meter scales within a context provided by larger landforms.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984; p 463
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Mars Radar Catalog (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-09
    Description: Radar observations of Mars have been conducted since 1963 using four Earth based facilities. Wavelengths have ranged from about 3 to about 70 cm. Experiments have been conducted in ranging, spectral, and mixed modes. Results include topographic profiles, estimates of dielectric constant and meter scale surface roughness, and qualtitative determinations of centimeter scale structure.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984; p 461-462
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Investigation of technology needs for avoiding helicopter pilot error related accidents (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Pilot error which is cited as a cause or related factor in most rotorcraft accidents was examined. Pilot error related accidents in helicopters to identify areas in which new technology could reduce or eliminate the underlying causes of these human errors were investigated. The aircraft accident data base at the U.S. Army Safety Center was studied as the source of data on helicopter accidents. A randomly selected sample of 110 aircraft records were analyzed on a case-by-case basis to assess the nature of problems which need to be resolved and applicable technology implications. Six technology areas in which there appears to be a need for new or increased emphasis are identified.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-3895 , NAS 1.26:3895 , ORI-TR-2384
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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