Highly Elliptical Orbits for Arctic observations: Assessment of ionizing radiation |
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Authors: | L.D. Trichtchenko L.V. Nikitina A.P. Trishchenko L. Garand |
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Affiliation: | 1. Geological Survey of Canada, Earth Sciences Sector, Natural Resources Canada, Ottawa, ON, Canada;2. Canada Centre for Remote Sensing, Earth Sciences Sector, Natural Resources Canada, Ottawa, ON, Canada;3. Data Assimilation and Satellite Meteorology Research, Science and Technology Branch, Environment Canada, Dorval, QC, Canada |
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Abstract: | The ionizing radiation environment was analyzed for a variety of potential Highly Elliptical Orbits (HEOs) with orbital periods ranging from 6 h to 24 h suitable to continuously monitor the Arctic region. Several models available from the ESA Space Environment Information System (SPENVIS) online tool were employed, including the new-generation AE9/AP9 model for trapped radiation. Results showed that the Total Ionizing Dose (TID) has a well-pronounced local minimum for the 14-h orbit, which is nearly identical to the overall minimum observed for the longest orbital period (24 h). The thickness of slab aluminum shielding required to keep the annual TID below 10, 5 and 3.33 krad (i.e. 150, 75 and 50 krad for 15 years of mission duration) for a 14-h orbit is 2.1, 2.7 and 3.1 mm respectively. The 16-h orbit requires an additional 0.5 mm of aluminum to achieve the same results, while the 24-h orbit requires less shielding in the order of 0.2–0.3 mm. Comparison between the AE8/AP8 and AE9/AP9 models was conducted for all selected orbits. Results demonstrated that differences ranged from −70% to +170% depending on orbit geometry. |
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Keywords: | Space environment Arctic Highly Elliptical Orbit Earth radiation belts Total Ionizing Dose |
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