Solar X-Ray Spectrum below 25 Angstroms.
Below 25 A, the solar spectrum consists primarily of the emission lines of Fe XVII, O VIII, O VII, and N VII. The lines of the more highly ionized atoms, Fe XVII and O VIII, originate in localized active regions. Lines of O VII and N VII emanate from the full disk.
Blake
R L
RL
Chubb
T A
TA
Friedman
H
H
Unzicker
A E
AE