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Follow science image reduction Pipeline.

Recall the definition of a source magnitude $$m_1 - m_2 = -2.5\log{\frac{F_1}{F_2}}$$

Where $m_1$ and $m_2$ are source magnitudes and $F_1$ and $F_2$ are the fluxes associated with those sources.

Absent a science frame that has already been calibrated to a flux standard, we can still extract source magnitudes from a science image. For this, we will first justify a proxy for the source flux.

Recall that radiant, spectral flux is the amount of radiant energy per second per square meter per wavelength.