Abstract IMAGE (Imager for Magnetopause-to-Aurora Global Exploration), NASA’s first Medium-class Explorer (MIDEX) mission, was led by Southwest Research Institute, successfully captured global neutral atom images of the Earth’s inner magnetosphere and far and extreme ultraviolet images of the aurora and plasmasphere, respectively, and performed radio sounding of various magnetospheric boundaries and regions, during the period May 2000 to December 2005. During the in-orbit checkout and deployment phase of IMAGE, two significant spacecraft attitude modes meriting further study became apparent. The first was an unanticipated forced precession of the core body driven by the spin-plane wire antennas of the Radio Plasma Imager (RPI), with an initial period on the order of 20 minutes. The second was a slower precession of the entire system, driven by gravity gradient acting on the extended wire spin plane and having a period of approximately 105 days. Star Trackers onboard the spacecraft enabled the periods of both motions to be very well constrained by attitude observations. Both motions are analyzed and calculated rates are compared to rates observed in star-tracker data for the actual system.


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    Titel :

    Forced Precessions of the IMAGE Spacecraft


    Beteiligte:
    Tapley, Mark (Autor:in)


    Erscheinungsdatum :

    2009




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch



    Klassifikation :

    BKL:    55.60 Raumfahrttechnik
    Lokalklassifikation TIB:    770/7040



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    Tapley, Mark | Online Contents | 2009


    Forced Precessions of the IMAGE Spacecraft

    Tapley, Mark | Springer Verlag | 2009




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