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Click on the region to discover what lies below this structure.
While bright loops and dark holes are commonly seen in X-ray images of the sun, other shapes inspire pareidolia but the cause of these shapes are not obvious.
When I first looked at the above thin_Be image, I noted an interesting wishbone shape. XRT observes the hottest parts of the sun's atmosphere and this shape suggests there is a long hot channel embedded in a region with little to no x-rays. There are no coronal holes (black regions) or active regions (bright white regions) anywhere near this structure.
To find out what could cause this, I downloaded an H-alpha (visible red light) image taken at the Cerro Tololo Observatory as part of the GONG network. I used the edge of the sun to align the images and discovered the cause of the long bright channel is a solar prominence.
Solar prominences are long, linear structures composed of cool plasma that is suspended in the atmosphere. They are typically embedded in dark tubes but sometimes, these tubes have a bright x-ray core that solar scientists have dubbed the chewy nougat.