Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Sodium_layer> ?p ?o }
Showing triples 1 to 50 of
50
with 100 triples per page.
- Sodium_layer abstract "The sodium layer refers to a layer within the Earth's mesosphere of unbound, non-ionized atoms of sodium. The altitude of this layer is usually located between 80–105 km (50–65 miles) and has a depth of about 5 km (3.1 mi). The sodium comes from the ablation of meteors. Atmospheric sodium below this layer is normally chemically bound in compounds such as sodium oxide, while above the layer the atoms tend to be ionized.The density varies with season; the average column density is roughly 4 billion sodium atoms/cm3.Atoms of sodium in this layer are typically in an excited state, and radiate weakly at a wavelengths around 589 nm, which is in the yellow portion of the spectrum. These radiation bands are known as the sodium D lines. The resulting radiation has been termed night glow.Astronomers have found the sodium layer to be useful for creating an artificial laser guide star in the upper atmosphere. The star is used by adaptive optics to compensate for movements in the atmosphere. As a result, optical telescopes can perform much closer to their theoretical limit of resolution.The sodium layer was first discovered in 1929 by American astronomer Vesto Slipher. In 1939 the British-American geophysicist Sydney Chapman proposed a reaction-cycle theory to explain the night-glow phenomenon.".
- Sodium_layer thumbnail Starfire_Optical_Range_-_sodium_laser.jpg?width=300.
- Sodium_layer wikiPageExternalLink sodium.htm.
- Sodium_layer wikiPageID "4220063".
- Sodium_layer wikiPageLength "2691".
- Sodium_layer wikiPageOutDegree "22".
- Sodium_layer wikiPageRevisionID "683263613".
- Sodium_layer wikiPageWikiLink Ablation.
- Sodium_layer wikiPageWikiLink Adaptive_optics.
- Sodium_layer wikiPageWikiLink Airglow.
- Sodium_layer wikiPageWikiLink Astronomer.
- Sodium_layer wikiPageWikiLink Atom.
- Sodium_layer wikiPageWikiLink Category:Astronomical_imaging.
- Sodium_layer wikiPageWikiLink Category:Atmosphere.
- Sodium_layer wikiPageWikiLink Earth.
- Sodium_layer wikiPageWikiLink Fraunhofer_lines.
- Sodium_layer wikiPageWikiLink Geophysics.
- Sodium_layer wikiPageWikiLink Ion.
- Sodium_layer wikiPageWikiLink Laser_guide_star.
- Sodium_layer wikiPageWikiLink Mesosphere.
- Sodium_layer wikiPageWikiLink Meteoroid.
- Sodium_layer wikiPageWikiLink Sodium.
- Sodium_layer wikiPageWikiLink Sodium_oxide.
- Sodium_layer wikiPageWikiLink Sydney_Chapman_(mathematician).
- Sodium_layer wikiPageWikiLink Telescope.
- Sodium_layer wikiPageWikiLink United_Kingdom.
- Sodium_layer wikiPageWikiLink United_States.
- Sodium_layer wikiPageWikiLink Vesto_Slipher.
- Sodium_layer wikiPageWikiLink File:Starfire_Optical_Range_-_sodium_laser.jpg.
- Sodium_layer wikiPageWikiLinkText "Sodium layer".
- Sodium_layer wikiPageWikiLinkText "mesospheric upper atmosphere".
- Sodium_layer wikiPageWikiLinkText "sodium layer".
- Sodium_layer wikiPageUsesTemplate Template:Convert.
- Sodium_layer wikiPageUsesTemplate Template:Reflist.
- Sodium_layer wikiPageUsesTemplate Template:Science-stub.
- Sodium_layer subject Category:Astronomical_imaging.
- Sodium_layer subject Category:Atmosphere.
- Sodium_layer comment "The sodium layer refers to a layer within the Earth's mesosphere of unbound, non-ionized atoms of sodium. The altitude of this layer is usually located between 80–105 km (50–65 miles) and has a depth of about 5 km (3.1 mi). The sodium comes from the ablation of meteors.".
- Sodium_layer label "Sodium layer".
- Sodium_layer sameAs Q993038.
- Sodium_layer sameAs Natriumschicht.
- Sodium_layer sameAs ナトリウム層.
- Sodium_layer sameAs 나트륨_층.
- Sodium_layer sameAs m.0bqnpr.
- Sodium_layer sameAs சோடியம்_அடுக்கு.
- Sodium_layer sameAs Q993038.
- Sodium_layer sameAs 钠层.
- Sodium_layer wasDerivedFrom Sodium_layer?oldid=683263613.
- Sodium_layer depiction Starfire_Optical_Range_-_sodium_laser.jpg.
- Sodium_layer isPrimaryTopicOf Sodium_layer.