<p>During a <a href="https://www.academia.edu/37785178/THEORETICAL_MODELLING_OF_CHROMOSPHERIC_EMISSION_LINES_THROUGH_THE_SOLAR_ACTIVITY_CYCLES_21_23_ACCORDING_TO_THE_OBSERVATIONAL_ANALYSIS_RESULTS?source=swp_share" rel="nofollow noreferrer">literature review</a> (<a href="https://inis.iaea.org/search/searchsinglerecord.aspx?recordsFor=SingleRecord&amp;RN=50003604" rel="nofollow noreferrer">abstract</a>), 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 &amp; 22. The velocity of FeII ions increases with decreasing density of the medium and increasing plage surfaces/region.</p>
<p>How are plage regions related to the density of medium and velocity FeII ions?</p>

CC BY-SA 4.0
2022-05-16T17:22:25.917Z
I have now edited the question, pls find the relevant paper
Autodidact
CC BY-SA 4.0
2022-05-17T06:05:23.883Z
@uhoh now I have linked the paper, pls check
Autodidact
CC BY-SA 4.0
2022-05-17T07:21:17.987Z
That's great, thanks! :-)
uhoh
<star><observational-astronomy><the-sun><data-analysis><spectra>
How are plage regions related to the density of medium and velocity FeII ions?
Autodidact
# How are plage regions related to the density of medium and velocity FeII ions?

(Asked by: username_0 on 2022-05-16)

During a [literature review](https://www.academia.edu/37785178/THEORETICAL_MODELLING_OF_CHROMOSPHERIC_EMISSION_LINES_THROUGH_THE_SOLAR_ACTIVITY_CYCLES_21_23_ACCORDING_TO_THE_OBSERVATIONAL_ANALYSIS_RESULTS?source=swp_share) ([abstract](https://inis.iaea.org/search/searchsinglerecord.aspx?recordsFor=SingleRecord&RN=50003604)), 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?

**Tags:** star, observational-astronomy, the-sun, data-analysis, spectra
> **Comments:**
> **username_0**: I have now edited the question, pls find the relevant paper  
> **username_0**: @uhoh now I have linked the paper, pls check  
> **username_1**: That's great, thanks! :-)  

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## 0 answers

