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During a literature review (abstract), I found that the intensity of FeII (298.5 nm) ions in the last solar minimum was higher than the two previous solar minima 21 & 22. The velocity of FeII ions increases with decreasing density of the medium and increasing plage surfaces/region.

How are plage regions related to the density of medium and velocity FeII ions?

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  • $\begingroup$ I have now edited the question, pls find the relevant paper $\endgroup$
    – Autodidact
    May 16 at 17:22
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    $\begingroup$ @uhoh now I have linked the paper, pls check $\endgroup$
    – Autodidact
    May 17 at 6:05
  • $\begingroup$ That's great, thanks! :-) $\endgroup$
    – uhoh
    May 17 at 7:21

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