Uploaded June 2012 | Updated September 2026, 2 weeks ago
AIA 211: This channel (as well as AIA 335) highlights the active region of the outer atmosphere of the Sun -- the corona. Active regions, solar flares, and coronal mass ejections will appear bright here. The dark areas -- called coronal holes -- are places where very little radiation is emitted, yet are the main source of solar wind particles.
Where: Active regions of the corona
Wavelength: 211 angstroms (0.0000000211 m) = Extreme Ultraviolet
Primary ions seen: 13 times ionized iron (Fe XIV)
Characteristic temperature: 2 million K (3.6 million ˚F)
AIA 211: This channel (as well as AIA 335) highlights the active region of the outer atmosphere of the Sun -- the corona. Active regions, solar flares, and coronal mass ejections will appear bright here. The dark areas -- called coronal holes -- are places where very little radiation is emitted, yet are the main source of solar wind particles.
Where: Active regions of the corona
Wavelength: 211 angstroms (0.0000000211 m) = Extreme Ultraviolet
Primary ions seen: 13 times ionized iron (Fe XIV)
Characteristic temperature: 2 million K (3.6 million ˚F)
