WhereUpper chromosphere and lower transition regionWavelength304 angstroms (0.0000000304 m) = Extreme UVPrimary ions seensingly ionized helium (He II)Characteristic temperature50,000 K (90,000 F)
AIA 171
Where Quiet corona and upper transition regionWavelength71 angstroms (0.0000000171m)=Extreme UVPrimary ions seen8 times ionized iron (Fe IX)Characteristic temperature1 million K (1.8 million F)
HMI Magnetogram
WherePhotosphereWavelength6173 angstroms (0.0000006173 m) = VisiblePrimary ions seenNeutral iron (Fe I)Characteristic temperature6,000 K (11,000 F)