MODEL RELEASED. Laser radar. Scientist Dan Walsh at the controls of a laser radar (lidar) which measures atmospheric aerosols,ozone levels & temperatures. The lidar projects 2 vertical beams at different wavelengths. The intensity of radiation scattered back (shown on screen) is analysed to determine the stratosphere's composi- tion at altitudes of 15-75 kilometres (km). Stratospheric aerosols come from volcanic erupt- ions,& are mainly comprised of sulphur and water. Ozone gas,mainly found above 19km,blocks harmful ultraviolet rays from the Sun. Photograph- ed at Mauna Loa Observatory on Hawaii,USA | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Fraser, Simon / Mauna Loa Observatory |
Taille de l’image : | 5505 px × 4490 px |
Model Release : | Disponible |
Property Release : | Non requis |
Restrictions : | - |