Astrophysics (Index)About

ultraviolet

(UV, ultraviolet light)
(electromagnetic radiation, wavelength 10-400 nm)

Ultraviolet (UV) is electromagnetic radiation (EMR) with wavelengths in the range of 10-400 nm, situated between visible light and X-ray radiation. Terms for subranges:

Terms used for sunscreen/sunblock:

More than a very small amount of ultraviolet is damaging to human health. Ultraviolet from the Sun is largely blocked from Earth ground level, the short-wavelength end of the visible atmospheric window allowing a fraction of the received UVA and smaller fractions of UVB and very little UVC. At high altitudes, larger fractions are allowed through.

Ultraviolet telescopes are generally space-based: ground telescopes and telescopes such as Hubble Space Telescope cover the NUV range and EUV is often observed by X-ray telescopes. Ultraviolet-specific telescopes include the International Ultraviolet Explorer (IUE), the Extreme Ultraviolet Explorer (EUVE), the Far Ultraviolet Spectroscopic Explorer (FUSE), and the Galaxy Evolution Explorer (GALEX).

Ultraviolet is a factor in a planet's habitability and the chances of life. Some UV is considered helpful in creating some of the molecules associated with Earth life, but too much UV breaks down vital molecules, and factors include the presence of a UV-protective atmosphere on extra-solar planets as well as the number and strength of the host star's stellar flares that include UV.


(EMR,spectrum,band)
Further reading:
http://en.wikipedia.org/wiki/Ultraviolet
WaveLFreqPhoton
Energy
  
10nm30PHz124eVbeginultraviolet
400nm750THz3.1eVendultraviolet

Referenced by pages:
A-type star (A)
Balmer series (H)
B-type star (B)
biofluorescence
black-body radiation
Bok globule
Cassini
cosmic background radiation (CBR)
ionized carbon fine structure line ([CII])
cosmic optical background (COB)
COLD GASS
C+
extragalactic background light (EBL)
evaporating gas globule (EGG)
electromagnetic spectrum
electromagnetic radiation (EMR)
epoch of reionization (EOR)
escape fraction
European Southern Observatory Very Large Telescope (ESO VLT)
ethylene (C2H4)
Europa Clipper
extreme ultraviolet (EUV)
Extreme Ultraviolet Explorer (EUVE)
FAUST
filter
fluorescence
Fabry-Pérot interferometer (FPI)
Far Ultraviolet Spectroscopic Explorer (FUSE)
Galaxy Evolution Explorer (GALEX)
Galileo
High Definition Space Telescope (HDST)
High Energy Transient Explorer (HETE)
ionized hydrogen (HII)
HII region (HII)
Hopkins Ultraviolet Telescope (HUT)
intergalactic medium (IGM)
IM­AGE
ionizing radiation
ionosphere
International Ultraviolet Explorer (IUE)
JUICE
Juno
Kiso Survey of Ultraviolet Excess Galaxies (KUG)
Large Binocular Telescope (LBT)
lunar water
LUVOIR
Lyman series (L)
Lyman-Werner photon
Mars Express
maser
MAVEN
Markarian galaxy (Mkn)
Midcourse Space Experiment (MSX)
MUSCLES
New Horizons (NF1)
nitrogen (N)
Orbiting Astronomical Observatory (OAO)
optical interferometer
optics
PanCET
passband
photodissociation region (PDR)
Palomar-Green Survey (PG)
PG 1159 star
photochemistry
photodissociation
photoevaporation
photoionization
photometric system
photon energy
pre-main-sequence star (PMS)
photomultiplier tube (PMT)
planetary nebula (PN)
protoplanetary disk (PPD)
Pioneer Venus Orbiter (PVO)
Rayleigh-Jeans law
reflector telescope
radio galaxy (RG)
Rosetta
spectral energy distribution (SED)
star formation rate (SFR)
Solar Maximum Mission (SMM)
Solar and Heliospheric Observatory (SOHO)
Spektr-RG (SRG)
standard model of a flare
stellar cluster (SC)
stellar flare
superconducting tunnel junction (STJ)
Strömgren sphere
Strömgren photometric system
Swift
tidal disruption event (TDE)
TIMED
TRACE
transition region
Tubingen Ultraviolet Echelle Spectrometer (TUES)
U
Upper Atmosphere Research Satellite (UARS)
Ultraviolet Imaging Telescope (UIT)
ULTRASAT
ultraviolet astronomy
UVOIR
Ultraviolet Hubble Ultra-deep Field (UVUDF)
visible light
Voyager
vegetation red edge (VRE)
WINGS
Wolf-Rayet star
Wisconsin Ultraviolet Photo-polarimeter Experiment (WUPPE)
XEUV
XMM-Newton
X-ray

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