This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
This graph image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.
It is recommended to name the SVG file “Mauna Loa atmospheric transmission.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.
Español: Transmisión atmosférica del Observatorio de Mauna Loa en Hawaii. Reducción de la radiación solar debido a las erupciones volcánicas del Monte Agung (1963, Indonesia), Volcán de Fuego (1974, Guatemala), El Chichón (1982, México), Monte Pinatubo (1991, Filipinas).
Mauna Loa Observatory atmospheric transmission. Reduced solar radiation due to volcanicaerosols labeled. {{PD-USGov-DOC-NOAA}} Source: http://www.cmdl.noaa.gov/albums/cmdl_overview/Slide18.sized.png