Fig. 20

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Critical Pd and |B|IMF values for the direct precipitation of SW toward the Earth surface for a southward IMF if (a) 5ΩS and (b) 10ΩS. The dashed gray region indicates the space weather conditions that lead to the direct precipitation of the SW toward the Earth surface. The dashed orange region shows the regular space weather conditions. The parameter T = 1.8× 105 K is fixed.
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