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  • Other Sources  (3)
  • GEOPHYSICS  (3)
  • Chemical Engineering
  • FLUID MECHANICS
  • 2005-2009
  • 1990-1994  (3)
  • 1970-1974
  • 1990  (3)
  • 1
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    A compressed marine data set for geomagnetic field modeling (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Some 13 million scalar magnetic field data points that have been collected from the world's ocean areas reside in the collection of the National Geophysical Data Center. In order to derive a suitable data set for modeling the geomagnetic field of the earth, each ship track is divided into 220 km segments. The distribution of the reduced data in position, time and local time is discussed. The along-track filtering process described has proved to be an effective method of condensing large numbers of shipborne magnetic data into a manageable and meaningful data set for field modeling. This process also provides the benefits of smoothing short-wavelength crystal anomalies, discarding data recorded during magnetically noisy periods, and assigning reasonable error estimates to be utilized in the least squares modeling.
    Keywords: GEOPHYSICS
    Type: Journal of Geomagnetism and Geoelectricity (ISSN 0022-1392); 42; 9, 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Topographic distribution of clear-sky radiation over the Konza Prairie, Kansas (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A method for exploring the topographic modulation of clear-sky incoming radiation using a two-stream atmospheric model together with digital elevation data is presented to obtain the temporal and spatial distribution of this energy. Utilizing this methodology for the Konza Prairie, it is observed that the variance and spatial autocorrelation of the simulated radiation data changed with sun angle and elevation grid spacing. An analytical formula that describes the behavior of the variance as a function of optical depth, sun angle, and mean terrain slope can be developed by considering direct solar radiation variability on a constant-slope terrain which has a uniform albedo and a uniform distribution of slopes. The decrease in mean slope and the increase in slope and autocorrelation is attributed to a loss of some of the shorter-wavelength terrain features at coarser grid spacings.
    Keywords: GEOPHYSICS
    Type: Water Resources Research (ISSN 0043-1397); 26; 679-690
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Observed and model-calculated NO2/NO ratios in tropospheric air sampled during the NASA GTE/CITE-2 field study (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Airborne measurements of NO2/NO ratios in the free troposphere, obtained using two-photon LIF (TP-LIF) and chemiluminescence (CL) detectors during the NASA Global Tropospheric Experiment Chemical Instrumentation Test and Evaluation 2 (CITE 2) program in summer 1986, are analyzed and compared with the predictions of a photochemical model. The derivation of the model is outlined, with an emphasis on the role of peroxy radicals in the fast photochemical cycling of NO and NO2 and the production of O3; the CITE 2 instruments and flight protocols are described; and the results are presented in extensive tables and graphs and discussed in detail. It was found that on three CITE 2 flights the CL data were systematically greater than the TP-LIF data; when these data were removed, the averaged values of the two instruments agreed to within 1 percent. The NO2/NO ratios predicted by the model are shown to be consistent with the measurements, although usually 20-25 percent lower.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 10235-10
    Format: text
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    NASA TECHNICAL REPORTS
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