By adding a small, Sun-blocking 'thumb' to an instrument door, astronomers working on the Solar Orbiter boosted its performance.
The spacecraft carries a suite of instruments to achieve its objectives, and one of them is the Extreme Ultraviolet Imager Belgium contributed the EUI to the mission, and its job is to image the layers and structures in the Sun’s atmosphere from the chromosphere to the corona.The EUI is actually three instruments in one: A full Sun imager and two high-resolution telescopes.
During the instrument’s final construction phase, one Solar Orbiter team member got a brilliant idea. The EUI has its own safety door to protect it during spaceflight and when it’s not in use. What if that door could be modified to improve the imager’s functioning? “Physics is changing there, the magnetic structures are changing there, and we never really had a good look at it before. There must be some secrets in there that we can now find.”The team calls this thumb and half-opened door the occulter mode of operation. It’s basically a new type of instrument. It combines theThis image shows the small “thumb” added to the door of the Full Sun Imager, a part of the EUI.
Auchère’s little addition to the EUI’s instrument door solves a problem that plagues extreme UV imagers. The depths of the Sun’s atmosphere are beyond the view of most of them, and traditional separate coronagraphs usually totally block this region out of necessity. But the EUI’s new occulter can more easily image this difficult region than ever before.
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