loading
City:

Ultraviolet radiation

Ultraviolet radiation is an electromagnetic radiation in the wavelength interval between x-rays and visible Light, i.e. from about 5 nanometers (nm) to about 400 nm. Ultraviolet (UV) radiation was discovered in 1801 by the German physicist, Johann Wilhelm Ritter, who found that the radiation outside the violet end of the visible solar spectrum could decompose silver chloride (AgCl).

Physiologically, ultraviolet radiation is extremely powerful, producing sunburn and causing the formation of vitamin D in the skin. Ultraviolet radiation is invisible, but can be harmful to the human eye.


Together with other kinds of radiation, UV radiation is generated by the Sun. The ultraviolet radiation in sunlight is divided into three bands: UV-A (320-400 nm), which can cause skin damage and may cause melanomatous skin cancer; UV-B (280-320 nm), stronger radiation that increases in the summer and is a common cause of sunburn and most common skin cancer; and UV-C (below 280 nm), the strongest and potentially most harmful form.


Much UV-B and most UV-C radiation is absorbed by the ozone layer of the atmosphere before it can reach the earth's surface; the depletion of this layer is increasing the amount of ultraviolet radiation that can pass through it. The radiation that does pass through is largely absorbed by ordinary window glass or impurities in the air (e.g., water, dust, and smoke) or is screened by clothing.


Add to social bookmarking:  | more |
A is for Air
Accessory clouds
Advection
Air masses and their sources
Air-mass Thunderstorm
Alpine Glow
Altocumulus
Anticyclone
Atmosphere - Diagram
Aurorae - Northern Lights
Average rainfall over England and Wales
Azores High
Banner Cloud - the peak's flag
Beaufort Scale
Blizzard
British Weather Terms
Brocken Spectre
Bubble High
Burning Time
CAPE - Convective Available Potential Energy
Cap cloud
Cc floccus
Cc lacunosus
Cc stratiformis
Cc undulatus
Central England Temperature
Centres of action
Ci fibratus
Ci radiatus
Ci spissatus
Ci uncinus
Ci vertebratus
Cirrocumulus
Cirrostratus
Cirrus
Clocks go Back from BST to GMT
Cloud classification
Cloud seeding
Cloud species
Cloud streets
Cloud types (genera)
Cloud variety
Clouds - sentry of the sky
Cold low
Comma Cloud
Comma Cloud
Convection
Coriolis effect
Corona
Crepuscular rays
Cut-off low
Dew Point
Dew
Discovery of the Jet Stream
Doppler radar
Drifting snow - blowing snow
Drought
Earth's Atmosphere
Easterly wave - the Hurricane's cradle
El Nino
Föhn (foehn) wind
Föhn wall
Flash Flood
Fog and Mist
Fogbow
Forecasting weather
Frost hollow
Fujita Scale Statistics
Fujita Tornado Scale
Funnel cloud
Genoa Low
Geostationary Satellites
Geostrophic Wind
Glaze and Black Ice
Glory
Grass Minimum Temperature
Gustnado
Hail
Hailstorms in Britain
Highs and Lows and Winds
History of Hurricane Names
Hoar Frost
Humidity
Inversions
Isobars on surface maps
Jack Frost
Jet stream cirrus from space
Katabatic winds
Key to our weather symbols
Lake-effect snow
Latent Heat
Levanter cloud
Millibar and hectopascal
Mirages
Mizzle
NOAA satellites
Nimbostratus
North Atlantic Drift (Gulf Stream)
Polar Orbiting Satellites
Polar low - the arctic hurricane
Precipitation Map
Radiosonde
Rain gauge
Rime
Roll cloud
Rotor cloud
Saffir-Simpson scales
Sc duplicatus
Sc perlucidus
Sc undulatus
Shelf Cloud
Sometimes a bit fishy
Sounding
Southern Oscillation
St. Swithun's Day
Standard Reference Period
Stevenson Screen
Stratocumulus
Stratosphere
Sun pillar
Supercooled clouds
Surface wind
Swell
TORRO
Thermocline
Thunderstorm Probability
Thunderstorms
Tornado Alley
Troposphere
Troposphere - Diagram
UV Index
Ultraviolet radiation
Virga or Fallstreak
What Makes Northern Lights Happen?
What does it mean?
Why Skies are Blue
Why Thunder Rumbles
World Meteorological Organisation (WMO)