On Halloween, NASA’s Solar Dynamics Observatory shared an image of a solar jack-o-lantern in an apparent ghoulish grin. Taking to Instagram, the National Aeronautics and Space Administration informed that the active regions in the image appear brighter because those are areas that emit more light and energy.
The Solar Dynamics Observatory (SDO) captured this image in October 2014. NASA shared that the active regions are markers of an intense and complex set of magnetic fields hovering in the sun’s atmosphere, the corona.
“This image blends together two sets of extreme ultraviolet wavelengths at 171 and 193 Angstroms, typically colourized in gold and yellow, to create a particularly Halloween-like appearance,” NASA said in a press release.