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NASA Technical Reports Server (NTRS) 19930020444: Revised predictio... |
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by NASA Technical Reports Server (NTRS) |
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The Long Duration Exposure Facility (LDEF) spacecraft |
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flew in a 28.5 deg inclination circular orbit with an |
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altitude in the range from 319.4 to 478.7 km. For this |
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orbital altitude and inclination, two components |
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contribute most of the penetrating charge particle |
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radiation encountered - the galactic cosmic rays and the |
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geomagnetically trapped Van Allen protons. Where |
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shielding is less than 1.0 g/sq cm geomagnetically |
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trapped electrons make a significant contribution. The |
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'Vette' models together with the associated magnetic |
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field models and the solar conditions were used to obtain |
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the trapped electron and proton omnidirectional fluences |
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reported previously. Results for directional proton |
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spectra using the MSFC anisotropy model for solar minimum |
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and 463 km altitude (representative for the LDEF mission) |
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were also reported. The directional trapped proton flux |
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as a function of mission time is presented considering |
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altitude and solar activity variation during the mission. |
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These additional results represent an extension of |
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previous calculations to provide a more definitive |
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description of the LDEF trapped proton exposure. |
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Date Published: 2016-10-02 19:39:39 |
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Identifier: NASA_NTRS_Archive_19930020444 |
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Item Size: 8991044 |
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Language: english |
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Media Type: texts |
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