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  • Other Sources  (2)
  • Geophysics  (2)
  • 1995-1999  (2)
  • 1985-1989
  • 1
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    Spherical Harmonics Analysis of the ECMWF Global Wind Fields at the 10-Meter Height Level During 1985: A Collection of Figures Illustrating Results (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Half-daily global wind speeds in the east-west (u) and north-south (v) directions at the 10-meter height level were obtained from the European Centre for Medium Range Weather Forecasts (ECMWF) data set of global analyses. The data set covered the period 1985 January to 1995 January. A spherical harmonic expansion to degree and order 50 was used to perform harmonic analysis of the east-west (u) and north-south (v) velocity field components. The resulting wind field is displayed, as well as the residual of the fit, at a particular time. The contribution of particular coefficients is shown. The time variability of the coefficients up to degree and order 3 is presented. Corresponding power spectrum plots are given. Time series analyses were applied also to the power associated with degrees 0-10; the results are included.
    Keywords: Geophysics
    Type: NASA-TM-104648 , NAS 1.15:104648 , Rept-97B00064
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Tests of Substorm Models' Predictions Using ISTP Observations (1998)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: This report provides progress to test the predictions of substorm models using ISTP observations. During the first year, two investigations were initiated in collaboration with a number of ISTP researchers. Both investigations use a combination of simultaneous measurements from high-, low-, and ground-altitude instruments to: (1) explore the role of MHD resonances in the onset and evolution of substorms, and (2) establish the timing of events in the magnetosphere and ionosphere during the substorm evolution beginning with the growth phase and ending with the recovery phase.
    Keywords: Geophysics
    Type: NASA/CR-1998-207796 , NAS 1.26:207796
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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