This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionSolar spectral irradiance.svg
English: Sun spectral irradiance measured with a calibrated spectrometer (Flame S-XR1-ES, Ocean Insight) mounted with a cosine corrector. The measurement was made on a sunny day on 13 June 2022 at noon from Hauterive, Switzerland (47°1′N 6°58′E). For photometry and colorimetry, standard measurements are usually carried out in the range 360 - 830 nm (highlighted area). Correlated color temperature (CCT): 5470 K.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible licence as the original.