Space probes designed to study the Sun are the last places you'd expect to have a moisture problem.
, launched in 1995) both have the same issue. In the first six months, SOHO's Solar EUV Monitor degraded by about 35 percent; in the five years following, it degraded by a further 60 percent.
Now they've figured out what it is, and it's surprising: oxidation of the aluminum, caused by the presence of water and induced by ultraviolet radiation. As the layers of oxidized metal build up, the filter becomes foggy, preventing it from admitting the light waves the sensor is designed to monitor.
To test the water hypothesis, the researchers used the NIST's Synchrotron Ultraviolet Radiation Facility to generate EUV radiation, blasting it at an aluminum filter in a vacuum chamber into which water vapor had been introduced. "It had to be something that can emit water for five years continuously at reasonably constant rates,"."That set Bobby [Berg] off on this quest to find, what the heck could this be? What could be a source that fits? And he found it."
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