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Relative difference between computed ambient dose equivalent H*(10) at the altitude of 35 kft a.s.l. and the reference data (Menzel 2010). (a) January 1998, modulation potential 427 MV, (b) January 2000, modulation potential 752 MV, (c) January 2002, modulation potential 977 MV. The modulation potential is according to Usoskin et al. (2011).
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