We use long-term electron and proton in-situ measurements made by the CXD particle instruments, developed by Los Alamos National Laboratory and carried on board GPS satellites, to determine total ionizing dose (TID) values and daily/yearly dose rate (DR) values in medium Earth orbits (MEOs) caused by the natural space radiation environment. Here measurement-based TID and DR values on a simplified sample geometry-a small (with a radius of 0.1 mm) Silicon detector within an Aluminum shielding sphere with a thickness of 100 mil-are compared to those calculated from empirical radiation models. Results over the solar cycle 24 show that electron TID from measurements in GPS orbit is well above the values calculated from the median/mean fluences from AE8 and AE9 models, but close to model fluences at high percentiles. Also, it is confirmed that in MEOs proton contributions to TID are minor and mainly dominated by solar energetic protons. Several factors affecting those dose calculations are discussed and evaluated. Results from this study provide us another out-of-sample test on the reliability of existing empirical space radiation models, and also help estimate the margin factors on calculated dose values in MEOs that pass through the heart of the Earth's outer radiation belt.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Determining Ionizing Doses in Medium Earth Orbits Using Long-Term GPS Particle Measurements


    Beteiligte:
    Chen, Yue (Autor:in) / Carver, Matthew R. (Autor:in) / Morley, Steven K. (Autor:in) / Hoover, Andrew S. (Autor:in)


    Erscheinungsdatum :

    06.03.2021


    Format / Umfang :

    8460870 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Calculating Ionizing Doses in Geosynchronous Orbit from In-situ Particle Measurements and Models

    Chen, Yue / Larsen, Brian A. / Henderson, Michael G. | IEEE | 2020



    Long-Term Lunar Effects on Orbits of Earth Satellites - Abstract

    Broucke, R. A. / American Astronautical Society| American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 1996


    LET-distributions and doses of HZE radiation components at near-earth orbits

    Silberberg, R. / Tsao, C.H. / Adams, J.H. Jr et al. | Elsevier | 1984