Explore: Spectral Irradiance

with radiant intensity. In astrophysics, irradiance is called radiant flux. Spectral irradiance is the irradiance of a surface per unit frequency or wavelength

surface element perpendicular to the Sun. Spectral versions of the above irradiances (e.g. spectral TSI, spectral DNI, etc.) are any of the above with units

E for radiant energy, P or F for radiant flux, I for irradiance, W for radiant exitance. Spectral quantities given per unit frequency are denoted with

induced erythema in human skin". CIE Journal. 6 (1): 17–22. "UV Spectral Irradiances & Erythemal Action Spectrum". NOAA. 2006. Webb, Ann R.; Slaper, Harry;

infrequently to verify the sensitivity of the first. The Solar Stellar Irradiance Comparison Experiment was designed to measure solar radiation. The instrument

mounted on a satellite observatory orbiting the Earth. Spectral measurements identify the irradiance of the Sun by characterizing the Sun's energy and emissions

incident wavelength. Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: M ( λ ) = ∂ 2 Φ ∂ A ∂ λ ≈ Φ

change. Since 2003, the SORCE Spectral Irradiance Monitor (SIM) has monitored Spectral solar irradiance (SSI) – the spectral distribution of the TSI. Data

surface per unit area, or equivalently the irradiance of a surface, integrated over time of irradiation, and spectral exposure is the radiant exposure per unit

EUV High-throughput Spectroscopic Telescope (EUVST) and the Solar Spectral Irradiance Monitor (SoSpIM). It is scheduled to launch in fiscal year 2028.