That is easy if irelevant:
Standard solar theory predicts that all these iron ion wavelengths originate where the temperatures are high enough to ionize the Fe ions.
Duh

!
For example the TRACE spacecraft will see emission from
- Fe II ions in the 1600 A passband.
- Fe IX ions in the 173 A passband.
- Fe XII ions in the 195 A passband.
- Fe XV ions in the 284 A passband.
Therefore we should expect to see "all these iron ion wavelengths" being emitted from regions with appropriate temperatures. Thses regions turn out to be above the photosphere.
How do we know that these regions are above the photosphere? We measure them!
- Block out the light from the Sun except for the corona. Measure the temperature. This ist he temperature of the corona.
- Ditto for the transition region.
- Ditto for the chromosphere.
- Ditto for the photosphere.
Astronomers also have techniques for measuring the positions of features in the 2D data that their instruments return.
Now MM.
What We are looking for is something like:
Your fantasy* "predicts' that all these iron ion wavelengths start .....therefore we should expect to see........in relationship to the photosphere/chromosphere boundary.
We need something to "test" in terms of your fantasy.
*A fantasy because it violates thermodynamics, e.g see
Micheal Mozina's iron crust has been debunked!
The fact that it fails many other observations (an iron crust at a temperature of > 9400 K

) and predicts absolutely nothing just makes it a joke. See the
over 50 questions that Michael Mozina is incapable of answering.