(electromagnetic radiation in the range of 10-124 nm)
Extreme ultraviolet (EUV or XUV) is
the shortest wavelength
ultraviolet radiation, adjacent to X-ray and
at the far end of the UV spectrum from visible light.
A typical cited wavelength-range is 10-124 nm
(ultraviolet's is 10-400 nm).
EUV is completely absorbed by Earth atmosphere
and its astronomical observation is carried out by space observatories.
Observation is used to study the corona of the Sun
(revealing the Sun's magnetic topology)
and to study the interstellar medium.
It is ionizing radiation, capable of significant photoionization,
a significant factor in some astrophysical processes, and a quality
that makes it a danger both to humans and to spacecraft.
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Referenced by pages:
Extreme Ultraviolet Explorer (EUVE)
high-energy astrophysics (HEA)
Lyman alpha (Ly-α)
Lyman series (L)
Solar Dynamics Observatory (SDO)
Solar and Heliospheric Observatory (SOHO)
Solar Orbiter (SolO)
Wien's displacement law