Fig. 1.
Top: structure of the solar wind and changes in coronal appearance and solar wind characteristics over a full cycle, as observed by Ulysses and SOHO. Middle: corresponding sunspot number. Adapted from McComas et al. (2013). Bottom: sunspot numbers for cycle 24 as a proxy for the activity expected in Cycle 25 during the PSP and SO mission time lines (sunspot numbers have been corrected; Clette & Lefèvre 2016).
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