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(a) Variations of 81-day running averaged F10.7 index from 1995 to 2002. (b–h) Same as Figure 1c but for DMSP F12 nightside measurements around the June Solstice of 1995–2001, respectively. The local time when the DMSP F12 satellite was over the equator is labeled at the top of each panel for reference; it shifted year by year.
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