PROBA2 LYRA radiometer

Observing the eclipse from space - clouds or not

These timelines provide the intensity in four extreme ultraviolet (EUV) wavelength bands as a function of time measured by PROBA2. This satellite orbits the Earth in 90 minutes. On the morning of 20 March, 2015, the Moon passed clearly 2 times through the LYRA field of view (FOV). The FOV is the angle through which LYRA is sensitive to EUV light. As the Moon moves in front of the Sun, slowly blocking EUV light, it will cause gradual decreases in the curves. Spikes in the curves usually correspond to solar flares.