a)−e) Overplots of RHESSI isocontours over the Hα images taken at different times during the rise phase of the X3.8 flare. RHESSI data are integrated for 30 s around 08:04 UT a), 09:42 UT b), 09:43 UT c), 09:45 UT d), and 09:49 UT e). Green isocontours indicate the emission at 12−25 keV, while orange and red isocontours indicate the emission at 25−50 keV and 50−100 keV, respectively. The contour levels are at 50, 60, 70, 80, 90, and 95% of maximum intensity. f) Light curve showing the Hα and X-ray emission during the time interval 09:32−10:05 UT for the region indicated by the white rectangle in b) (note that there is a gap in the Hα data between 09:50 and 09:58 UT).
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