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  • 1
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    Comparison of earth rotation as inferred from radio interferometric, laser ranging and astrometric observations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results of measurements of the earth's rotation vector for a 400-day period from late September 1980 to December 1981, for which date from VLBI, satellite laser ranging (SLR), and lunar laser ranging (LLR) were available, are compared. The acquisition of the data and their evaluation are described. VLBI, SLR, and classical astrometric determinations of the X-parameter required to describe the location of the rotation pole on the earth's surface are shown, and VLBI, LLR, and classical astrometric determinations of the angle of rotation about this pole (UT1) are presented. The results indicate that VLBI and SLR, at their present stages of development, yield standard errors under 20 cm in the determinations of X, about twofold smaller than obtained from classical measurements, and that VLBI and LLR yield determination of UT1 with standard errors less than 40 cm, somewhat smaller than that of the corresponding determinations from classical observations. Methods for improving these types of intercomparisons are suggested.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 302; April 7
    Format: text
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  • 2
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    Atmospheric study relating to pad lift-off and entry landing (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A relationship between the atmospheric general circulation and geophysical hydrodynamic experiments was sought by attempting to find a relationship between wave number and temperature gradient at mid-latitudes at 500 mb. To this end data were gathered from four winter seasons and analyzed. The statistical analysis failed to provide convincing support for the hypothesis of a direct relationship between wave number and temperature gradient, although an indication that the transient waves may be so related was noted.
    Keywords: GEOPHYSICS
    Type: NASA-CR-150621 , SAI-78-780-HU
    Format: application/pdf
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  • 3
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    Aerodynamic size distribution of suspended particulate matter in the ambient air in the city of Cleveland, Ohio (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The City of Cleveland Division of Air Pollution Control and NASA jointly investigated the chemical and physical characteristics of the suspended particulate matter in Cleveland, and as part of the program, measurements of the particle size distribution of ambient air samples at five urban locations during August and September 1972 were made using high-volume cascade impactions. The distributions were evaluated for lognormality, and the mass median diameters were compared between locations and as a function of resultant wind direction. Junge-type distributions were consistent with dirty continental aerosols. About two-thirds of the suspended particulate matter observed in Cleveland is less than 7 microns in diameter.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-3124 , E-8024
    Format: application/pdf
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  • 4
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    Statistical summary of air quality data for metropolitian Cleveland, Ohio, 1967 - 1972: Total suspended particulates, nitrogen dioxide, and sulfur dioxide (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Air-quality data for metropolitan Cleveland, Ohio, from 1967 through 1972 were collated and statistically analyzed. Total suspended particulates (TSP) departed from lognormal distribution in 1972. Nitrogen dioxide and sulfur dioxide, departed significantly from lognormal distributions in 1972. In Cleveland the Ohio standards were not met. However, the data indicate a general improvement in air quality. Unusually high precipitation (43% above the average in 1972) may be responsible in lowering these values from the 1971 levels. The mean values of TSP, NO2, and SO2 are 104, 191, and 83 microgram/cu m respectively.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-3113 , E-7850
    Format: application/pdf
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  • 5
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    Atmospheric angular momentum and the length of day - A common fluctuation with a period near 50 days (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Four astronomical measures of changes in the length of day obtained in 1979 have been shown to exhibit the same, approximately 50-day fluctuation. To find whether this fluctuation was persistent, and of meteorological origin, lunar laser ranging observations and wind data deduced from sources distributed over the globe were analyzed. A high degree of correlation was found between the two sets of data. It is implied that the 50-day period fluctuations in length of day are real and related to meteorological effects. Observed changes in length of day can provide a constraint for models for atmospheric flow, and a partial check for global analyses of such motions.
    Keywords: GEOPHYSICS
    Type: Nature; 294; Dec
    Format: text
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  • 6
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    A computer version of the US Standard Atmosphere, 1978 (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer version of the U.S. Standard Atmosphere, 1976, was developed. The computer program was developed in modular form for easy incorporation into the user's program and for easy modification for specialized uses.
    Keywords: GEOPHYSICS
    Type: NASA-CR-150778
    Format: application/pdf
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  • 7
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    Earth rotation from lunar laser ranging (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Since the time when the first laser retroreflector was placed on the lunar surface by the Apollo 11 astronauts, lunar laser ranging (LLR) has led to advances in a wide range of disciplines, including the study of variations in the rotation of the earth. The conventional techniques used to monitor earth rotation suffer from lack of precision on time scales of a few months and less. LLR, by contrast, makes it possible to monitor small changes in earth rotation with a temporal resolution of the order of 1 day. Studies of earth rotation by LLR are discussed, taking into account data sensitivity, aspects of data analysis, the variation of latitude, and UTO, the mean solar time at the site as affected by polar motion.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; Dec. 10
    Format: text
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  • 8
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    Preliminary analysis of an extensive one year survey of trace elements and compounds in the suspended particulate matter in Cleveland, Ohio (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Preliminary review of a study of trace elements and compound concentrations in the ambient suspended particulate matter in Cleveland, Ohio, measured from August 1971 through June 1973, as a function of source, monitoring location, and meteorological conditions. The study is aimed at the development of techniques for identifying specific pollution sources which could be integrated into a practical system readily usable by an enforcement agency.
    Keywords: GEOPHYSICS
    Type: Earth Environmental Resources Conference; Sept. 10-12, 1974; Philadelphia, PA
    Format: text
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  • 9
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    Length of day and atmospheric angular momentum - A comparison of 1981-1983 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: In connection with the availability of observations of increasingly greater accuracy and higher time resolution, studies have been conducted regarding the relationship between the earth's rotation and the angular momentum of its atmosphere. The present paper reports an investigation conducted on the basis of earth rotation values determined during the time from 1981 to 1983 with the aid of very long baseline interferometry (VLBI), lunar laser ranging (LLR), and satellite laser ranging (SLR). The values obtained with the different techniques were compared, and a combined series of length of day (LOD) values were computed. A similar computation procedure was applied to the atmospheric angular momentum (AAM) values of U.S. and European origin to obtain corresponding series of LOD values.
    Keywords: GEOPHYSICS
    Type: AD-A164708 , AFGL-TR-85-0035 , Journal of Geophysical Research (ISSN 0148-0227); 90; 12
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