The geocorona is the luminous part of the outermost region of the Earth's atmosphere, the exosphere. It is seen primarily via far-ultraviolet light (Lyman-alpha) from the Sun that is scattered from neutral hydrogen.[1] It extends to at least 15.5 Earth radii and probably up to about 100 Earth radii.[2] The geocorona has been studied from outer space by the Astrid satellites and the Galileo spacecraft (among others), using its ultraviolet spectrometer (UVS) during an Earth flyby.

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  1. Kameda, S.; Ikezawa, S.; Sato, M.; Kuwabara, M.; Osada, N.; Murakami, G.; Yoshioka, K.; Yoshikawa, I.; Taguchi, M.; Funase, R.; Sugita, S.; Miyoshi, Y.; Fujimoto, M. (16 December 2017). "Ecliptic North-South Symmetry of Hydrogen Geocorona". Geophysical Research Letters. 44 (23): 11, 706–11, 712. doi:10.1002/2017GL075915.
  2. Baliukin, I. I.; Bertaux, J.-L.; Quémerais, E.; Izmodenov, V. V.; Schmidt, W. (15 February 2019). "SWAN/SOHO Lyman‐α mapping: the Hydrogen Geocorona Extends Well Beyond The Moon". Journal of Geophysical Research: Space Physics. doi:10.1029/2018JA026136.

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