Revised prediction of LDEF exposure to trapped protons

Details Revised prediction of LDEF exposure to trapped protons Revised prediction of LDEF exposure to trapped protons

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ldef.symp..137w&link_type=abstract

In NASA. Langley Research Center, LDEF: 69 Months in Space. Part 1: Second Post-Retrieval Symposium p 137-145 (SEE N93-29621 11-

Computer Science

Galactic Cosmic Rays, Long Duration Exposure Facility, Protons, Radiation Belts, Radiation Dosage, Magnetic Fields, Radiation Shielding, Solar Activity Effects

Scientific paper

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

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