@prefix mdl: <http://data.loterre.fr/ark:/67375/MDL> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

mdl: a skos:ConceptScheme .
mdl:-RSH5G01P-P
  skos:hiddenLabel "Rayonnement kilométriques auroraux"@fr, "Rayonnement kilométrique auroral"@fr, "auroral kilometric radiations"@en, "rayonnements kilométriques auroraux"@fr, "Auroral kilometric radiation"@en ;
  skos:inScheme mdl: ;
  skos:exactMatch <https://fr.wikipedia.org/wiki/Rayonnement_kilom%C3%A9trique_auroral>, <https://en.wikipedia.org/wiki/Auroral_kilometric_radiation> ;
  skos:definition "Le rayonnement kilométrique auroral (en anglais, auroral kilometric radiation ou AKR) est généré au-dessus de la Terre par les mêmes particules solaires qui produisent les aurores boréales et australes. La Terre n'est pas la seule planète du système solaire à en émettre. Jupiter et Saturne sont également le siège d'un tel phénomène. (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/Rayonnement_kilom%C3%A9trique_auroral\" target=\"_blank\">https://fr.wikipedia.org/wiki/Rayonnement_kilom%C3%A9trique_auroral</a>)"@fr, "Auroral kilometric radiation (AKR) is the intense radio radiation emitted in the acceleration zone (at a height of three times the radius of the Earth) of the polar lights. The radiation mainly comes from cyclotron radiation from electrons orbiting around the magnetic field lines of the Earth. The radiation has a frequency of between 50 and 500 kHz and a total power of between about 1 million and 10 million watts. The radiation is absorbed by the ionosphere and therefore can only be measured by satellites positioned at vast heights, such as the Fast Auroral Snapshot Explorer (FAST). According to the data of the Cluster mission, it is beamed out in the cosmos in a narrow plane tangent to the magnetic field at the source. The sound produced by playing AKR over an audio device has been described as \"whistles\", \"chirps\", and even \"screams\". As some other planets emit cyclotron radiation too, AKR could be used to learn more about Jupiter, Saturn, Uranus and Neptune, and to detect extrasolar planets. (Wikipedia, The Free Encyclopedia, <a href=\"https://en.wikipedia.org/wiki/Auroral_kilometric_radiation\" target=\"_blank\">https://en.wikipedia.org/wiki/Auroral_kilometric_radiation</a>)"@en ;
  skos:broader mdl:-N2JTH5BP-5 ;
  skos:prefLabel "auroral kilometric radiation"@en, "rayonnement kilométrique auroral"@fr ;
  a skos:Concept ;
  skos:altLabel "AKR"@en .

mdl:-N2JTH5BP-5
  skos:prefLabel "onde radioélectrique"@fr, "radio wave"@en ;
  a skos:Concept ;
  skos:narrower mdl:-RSH5G01P-P .