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If an X28 flare emits continuously for 5
minutes and then stops, calculate the total
soft x-ray energy emitted. Assume all of the
energy is emitted in the wavelength range
between 1 and 8 Angstroms. Assume the
flare energy is radiated away from the solar
surface evenly into a half-sphere centered
on the Sun.
1.18 x 1023
3.16 x 1022 J
1.18 x 1021 J
8.44 x 1021 J

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