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    Development and Implementation of an Empirical Ionosphere Variability Model (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Spacecraft designers and operations support personnel involved in space environment analysis for low Earth orbit missions require ionospheric specification and forecast models that provide not only average ionospheric plasma parameters for a given set of geophysical conditions but the statistical variations about the mean as well. This presentation describes the development of a prototype empirical model intended for use with the International Reference Ionosphere (IRI) to provide ionospheric Ne and Te variability. We first describe the database of on-orbit observations from a variety of spacecraft and ground based radars over a wide range of latitudes and altitudes used to obtain estimates of the environment variability. Next, comparison of the observations with the IRI model provide estimates of the deviations from the average model as well as the range of possible values that may correspond to a given IRI output. Options for implementation of the statistical variations in software that can be run with the IRI model are described. Finally, we provide example applications including thrust estimates for tethered satellites and specification of sunrise Ne, Te conditions required to support spacecraft charging issues for satellites with high voltage solar arrays.
    Keywords: Geophysics
    Type: 34th COSPAR Sessions World Space Conference; Oct 10, 2002 - Oct 19, 2002; Houston, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Ground Test of the Urine Processing Assembly for Accelerations and Transfer Functions (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This viewgraph presentation gives an overview of the ground test of the urine processing assembly for accelerations and transfer functions. Details are given on the test setup, test data, data analysis, analytical results, and microgravity assessment. The conclusions of the tests include the following: (1) the single input/multiple output method is useful if the data is acquired by tri-axial accelerometers and inputs can be considered uncorrelated; (2) tying coherence with the matrix yields higher confidence in results; (3) the WRS#2 rack ORUs need to be isolated; (4) and future work includes a plan for characterizing performance of isolation materials.
    Keywords: Man/System Technology and Life Support
    Type: MG-01-677 , Microgravity Integrated Product Team/Microgravity Analysis Team Meeting; Mar 12, 2002; Houston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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