The temperature of the sunspot is 5290K.
Flux is directly proportional to brightness (energy per second falling on a unit area of your detector) (energy per second being radiated away from a unit area of the source).
In turn, flux is proportional to the temperature to the fourth power (Stefan-Boltzmann Law).
Consequently, tsunspot/bphotosphere = T4sunspot/T4photosphere
(bsunspot/bphotosphere) = T4sunspot + T4photosphere
(bsunspot/bphotosphere) Tsunspot =Tphotosphere
By putting in the values, we get,
1/4 = 5780 K (0.7)
1/4 = 5780 x 0.915 = 5290 K
Therefore, temperature of the sunspot is 5290K.
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