Fig. 7
a) SDO/AIA 171 Å image. The box marks the region where the 171 Å fluxes are computed. b) SDO/AIA 171 Å flux normalized to the background level, which is defined as the flux in the quiet Sun region (see Sect. 2.1 for more details). The vertical dashed line marks the time of the 171 Å image in panel a). A movie showing the evolution of this figure from 03:00 to 05:00 UT is available online.
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