Abstract
Exposure of spacecraft presented as two semi-spherical layers of different inside diameters to radiation-belt protons is simulated. The proton angular distributions are calculated by converting the global trapped-proton flux defined by the model description (Russian State Standard 25645.138-86), making allowance for the proton flux west-east asymmetry. The calculation results have shown that the occurrence of the west-east asymmetry effect at altitudes of < 500 km in the Brazil magnetic anomaly permits the equivalent dose received by a crew to be reduced additionally by a factor of 1.5-2.0 by means of an appropriate reorientation of a spacecraft and the choice of an optimal distribution of the shielding matter masses.
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