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

mdl: a skos:ConceptScheme .
mdl:-V0J9WFJ3-9
  skos:prefLabel "souffle auroral"@fr, "auroral hiss"@en ;
  a skos:Concept ;
  skos:related mdl:-RN0HCZ1W-5 .

mdl:-N2JTH5BP-5
  skos:prefLabel "onde radioélectrique"@fr, "radio wave"@en ;
  a skos:Concept ;
  skos:narrower mdl:-RN0HCZ1W-5 .

mdl:-RN0HCZ1W-5
  skos:hiddenLabel "Rayonnement ultras basses fréquences"@fr, "rayonnements UBF"@fr, "ultralow frequencies"@en, "Ultralow frequency radiation"@en, "Rayonnement ultra basse fréquence"@fr, "ultras basses fréquences"@fr, "rayonnements ULF"@fr ;
  a skos:Concept ;
  skos:prefLabel "ultra basse fréquence"@fr, "ultralow frequency"@en ;
  skos:exactMatch <https://fr.wikipedia.org/wiki/Ultra_basse_fr%C3%A9quence>, <https://en.wikipedia.org/wiki/Ultra_low_frequency> ;
  skos:broader mdl:-N2JTH5BP-5 ;
  skos:definition "Ultra low frequency (ULF) is the ITU designation for the frequency range of electromagnetic waves between 300 hertz and 3 kilohertz, corresponding to wavelengths between 1,000 to 100 km. In magnetosphere science and seismology, alternative definitions are usually given, including ranges from 1 mHz to 100 Hz, 1 mHz to 1 Hz, and 10 mHz to 10 Hz. Many types of waves in the ULF frequency band can be observed in the magnetosphere and on the ground. These waves represent important physical processes in the near-Earth plasma environment. The speed of the ULF waves is often associated with the Alfvén velocity that depends on the ambient magnetic field and plasma mass density. (Wikipedia, The Free Encyclopedia, <a href=\"https://en.wikipedia.org/wiki/Ultra_low_frequency\" target=\"_blank\">https://en.wikipedia.org/wiki/Ultra_low_frequency</a>)"@en, "On appelle ultra basse fréquence (ULF), Ultra low frequency en anglais, la bande de radiofréquences qui s'étend de 300 à 3 000 Hz (longueur d'onde de 100 à 1 000 km). (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/Ultra_basse_fr%C3%A9quence\" target=\"_blank\">https://fr.wikipedia.org/wiki/Ultra_basse_fr%C3%A9quence</a>)"@fr ;
  skos:altLabel "ULF"@en, "rayonnement ULF"@fr, "rayonnement UBF"@fr ;
  skos:inScheme mdl: ;
  skos:related mdl:-V0J9WFJ3-9 .