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[–] KillerMech 0 points 7 points (+7|-0) ago 

They are saying the wavelength that the light is seen in is ultraviolet, that the ionized iron particles are 2.8 million degrees Celsius.

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[–] carlip 1 points -1 points (+0|-1) ago 

Ok that makes sense, except for iron particles. The sun is not fusing anything into iron yet.

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[–] FructuoSo 0 points 4 points (+4|-0) ago 

And never will fuse. It already has iron because it is not a first generation star

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[–] aeschynanthus 0 points 2 points (+2|-0) ago 

Also I think the temperature is the temperature required for that particular iron spectral line to form. Another spacecraft, STEREO, says in its site about observations made at 284 Å (= 28.4 nm) in the extreme ultraviolet region:

Light at this wavelength is emitted by Fe XV (iron ionized fourteen times) at 2.2 million degrees K.

"Ionized fourteen times" means 'having fourteen electrons removed'. I would think 2.8 million degrees gives iron with even more electrons removed.