measured in units of apparent magnitude per square arcsecond of sky.

Calculation

In order to calculate the relative intensity of airglow, the apparent magnitudes must be converted into fluxes of photons; this clearly depends on the spectrum of the source, but we will ignore that initially. At visible wavelengths, we need the parameter S₀(V), the power per square centimetre of aperture and per micrometre of wavelength produced

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