Scientists have used Solar Orbiter's EUI camera in a new mode of operation to record part of the sun's atmosphere at extreme ultraviolet wavelengths that has been almost impossible to image until now. This new mode of operation was made possible with a last-minute 'hack' to the camera and will almost certainly influence new solar instruments for future missions.
Solar Orbiter's Extreme Ultraviolet Imager returns high-resolution images of the structures in the sun's atmosphere. Scientists call this region the. During EUI's construction, a last-minute modification to the safety door on the front of the instrument has allowed it to see deeper into its target region than originally specified.
It involved adding a small, protruding"thumb," weighing a few grams, to the door of the instrument. As the door slides out of the way to let the light into the camera, if it is stopped halfway, the thumb covers the sun's bright disk, and EUI can detect the million-times fainter ultraviolet light coming from the surrounding corona.
The movie shows an ultraviolet image of the sun's corona taken using the EUI occulter. An ultraviolet image of the sun's disk has been superimposed in the middle, in the area left blank by the occulter. The image of the sun's disk has been taken by NASA's STEREO mission, which happened to be looking at the sun from almost the same direction as Solar Orbiter at the same time, so the features on the surface have a good correlation to the features in the corona.
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