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Table 1.

SDO/AIA channels, adapted from Lemen et al. (2012).

Channel [Å] Primary ion(s) Region of atmosphere Char. temp. [K]
1700 Continuum Temperature minimum, photosphere 5000
304 He II Chromosphere, transition region 50 000
171 Fe IX Quiet corona, upper transition region 6.3 × 105
193 Fe XII, XXIV Corona and hot flare plasma 1.6 × 106, 2 × 107

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