NASA SDO - Transit of Venus, 211 Angstrom @LittleSDOHMI

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)

NASA SDO - Transit of Venus, 211 Angstrom

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