Geocorona refers to the outermost part of the Earth's atmosphere, which consists of a tenuous layer of hydrogen gas that extends up to about 10,000 kilometers (6,200 miles) above the planet's surface. The geocorona is created by a process known as photoionization, where ultraviolet light from the Sun ionizes hydrogen atoms in the upper atmosphere, causing them to emit light and creating a glowing halo around the Earth. The geocorona is most easily visible during twilight, when the Sun is just below the horizon and the Earth's shadow creates a distinct boundary between the illuminated and unilluminated parts of the atmosphere. Astronomers have studied the geocorona using a variety of instruments, including ultraviolet telescopes and spacecraft, in order to better understand the Earth's upper atmosphere and its interaction with the solar wind and other phenomena in space.
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