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

mdl:-K97RVF06-G
  skos:prefLabel "whistler wave"@en, "onde siffleuse"@fr ;
  a skos:Concept ;
  skos:related mdl:-M97SDCN5-B .

mdl:-N2JTH5BP-5
  skos:prefLabel "onde radioélectrique"@fr, "radio wave"@en ;
  a skos:Concept ;
  skos:narrower mdl:-M97SDCN5-B .

mdl:-V0J9WFJ3-9
  skos:prefLabel "souffle auroral"@fr, "auroral hiss"@en ;
  a skos:Concept ;
  skos:related mdl:-M97SDCN5-B .

mdl:-M97SDCN5-B
  skos:hiddenLabel "rayonnements VLF"@fr, "Rayonnement très basses fréquences"@fr, "rayonnements TBF"@fr, "veries low frequencies"@en, "Very low frequency radiation"@en, "Rayonnement très basse fréquence"@fr, "très basses fréquences"@fr ;
  skos:exactMatch <https://fr.wikipedia.org/wiki/Tr%C3%A8s_basse_fr%C3%A9quence>, <https://en.wikipedia.org/wiki/Very_low_frequency> ;
  skos:definition "Very low frequency or VLF is the ITU designation for radio frequencies (RF) in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively. The band is also known as the myriameter band or myriameter wave as the wavelengths range from one to ten myriameters (an obsolete metric unit equal to 10 kilometers). Due to its limited bandwidth, audio (voice) transmission is highly impractical in this band, and therefore only low data rate coded signals are used. The VLF band is used for a few radio navigation services, government time radio stations (broadcasting time signals to set radio clocks) and for secure military communication. Since VLF waves can penetrate at least 40 meters (131 ft) into saltwater, they are used for military communication with submarines. (Wikipedia, The Free Encyclopedia, <a href=\"https://en.wikipedia.org/wiki/Very_low_frequency\" target=\"_blank\">https://en.wikipedia.org/wiki/Very_low_frequency</a>)"@en, "La très basse fréquence, en anglais Very low frequency (VLF), désigne la bande de radiofréquences qui s'étend de 3 kHz à 30 kHz (longueur d'onde de 100 à 10 km). Les ondes VLF sont aussi appelées ondes myriamétriques (le myria- est un préfixe obsolète valant 10 000). (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/Tr%C3%A8s_basse_fr%C3%A9quence\" target=\"_blank\">https://fr.wikipedia.org/wiki/Tr%C3%A8s_basse_fr%C3%A9quence</a>)"@fr ;
  skos:inScheme mdl: ;
  skos:prefLabel "very low frequency"@en, "très basse fréquence"@fr ;
  skos:broader mdl:-N2JTH5BP-5 ;
  a skos:Concept ;
  skos:altLabel "rayonnement VLF"@fr, "rayonnement TBF"@fr, "VLF"@en ;
  skos:related mdl:-V0J9WFJ3-9, mdl:-K97RVF06-G .

mdl: a skos:ConceptScheme .