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A whistler is a very low frequency or VLF electromagnetic (radio) wave generated by lightning. Frequencies of terrestrial whistlers are 1 kHz to 30 kHz, with a maximum amplitude usually at 3 kHz to 5 kHz. Although they are electromagnetic waves, they occur at audio frequencies, and can be converted to audio using a suitable receiver. They are produced by lightning strikes (mostly intracloud and return-path) where the impulse travels along the Earth's magnetic field lines from one hemisphere to the other. They undergo dispersion of several kHz due to the slower velocity of the lower frequencies through the plasma environments of the ionosphere and magnetosphere. Thus they are perceived as a descending tone which can last for a few seconds. The study of whistlers categorizes them into Pure N

AttributesValues
rdf:type
rdfs:label
  • Whistler (Radio) (de)
  • Radio silbido (es)
  • Mode sifflement (fr)
  • Whistler (radio) (it)
  • Whistler (radio) (nl)
  • Whistler (radio) (en)
  • Visslare (sv)
rdfs:comment
  • Le mode sifflement est un mode de propagation dispersif dans les plasmas magnétisés. Excitées par les parasites atmosphériques créés par la foudre, des perturbations se propagent dans la magnétosphère d'un hémisphère à l'autre de la Terre. Son caractère dispersif provoque un étalement des fréquences. L'enregistrement du signal transposé en signal acoustique donne l'impression d'un sifflement. Ce sifflement caractéristique est dénommé « siffleur » (issu de « whistler » en anglais). (fr)
  • Whistlers zijn radiogolven die worden veroorzaakt door bliksemontladingen. Bij een krachtige bliksem wordt niet alleen een lichtflits en een donder geproduceerd, maar wordt ook een heel spectrum van radiogolven uitgezonden. De meeste golflengten van deze "radioknal" worden door de ionosfeer naar het aardoppervlak teruggekaatst. Radiogolven met een zeer lange golflengte (tussen 30 en 300 km) dringen echter wel door de ionosfeer en komen in de exosfeer terecht. Behalve op Aarde zijn deze effecten ook op Jupiter waargenomen. (nl)
  • Ein Whistler ist ein niederfrequentes elektromagnetisches Signal, das beispielsweise durch Gewitter erzeugt werden kann. Die Frequenzen eines Whistlers liegen zwischen 1 und 30 kHz, gewöhnlich mit einem Maximum zwischen 3 und 5 kHz. Somit liegen sie von der Frequenz her im Hörbereich des Menschen und können mit einem geeigneten Empfänger direkt in akustische Signale umgewandelt werden. Whistler wurden auch von Jupiter empfangen, was die dortige Existenz von Gewittern nachweist. (de)
  • Se denomina radio silbido, silbador o silbado (whistler en inglés), a una onda electromagnética de radio de muy baja frecuencia, generada por los relámpagos.​ Los radiosilbidos se detectaron por primera vez durante la Primera Guerra Mundial. En un espectrograma de banda ancha, su principal característica observable es que su tono desciende rápidamente durante unos segundos, origen del nombre "silbador". El estudio de estos silbidos los clasifica en cuatro tipos: "Pure Note", "Diffuse", "2-Hop" y "Echo Train" (Nota pura, Difuso, Doble salto, y Eco de ferrocarril).​ (es)
  • A whistler is a very low frequency or VLF electromagnetic (radio) wave generated by lightning. Frequencies of terrestrial whistlers are 1 kHz to 30 kHz, with a maximum amplitude usually at 3 kHz to 5 kHz. Although they are electromagnetic waves, they occur at audio frequencies, and can be converted to audio using a suitable receiver. They are produced by lightning strikes (mostly intracloud and return-path) where the impulse travels along the Earth's magnetic field lines from one hemisphere to the other. They undergo dispersion of several kHz due to the slower velocity of the lower frequencies through the plasma environments of the ionosphere and magnetosphere. Thus they are perceived as a descending tone which can last for a few seconds. The study of whistlers categorizes them into Pure N (en)
  • Un whistler è un segnale naturale costituito da onde elettromagnetiche di frequenza molto bassa, ossia onde radio nella banda VLF, generato da un fulmine. Le frequenze dei whistlers terrestri sono comprese tra 1 kHz e 30 kHz, con un'ampiezza massima di solito fra 3 kHz e 5 kHz. Anche se i whistlers sono costituiti da onde elettromagnetiche, si verificano a frequenze audio e possono essere convertiti in segnali audio utilizzando un apposito ricevitore. Sono prodotti da fulmini per i quali l'impulso viaggia lungo le linee di forza del campo magnetico terrestre da un emisfero all'altro. Questi impulsi sono soggetti al fenomeno della dispersione che separa le varie frequenze con diverso valore in kHz, a causa della minore velocità delle frequenze più basse attraverso gli ambienti di plasma del (it)
  • En visslare är ett elektromagnetiskt (radio-)vågfenomen i rymden i samma frekvensområde som hörbart ljud, karakteriserat av att frekvensen sjunker flera kHz på några sekunder. Visslarnas frekvens ligger typiskt mellan 1 och 30 kHz, det vill säga i VLF-bandet. När visslarsignalerna omvandlas till ljud i en radiomottagare låter de som i tonhöjd sjunkande visslingar, vilket gett dem deras namn. Visslare har mottagits från Jupiter, och visat att blixtar förekommer där. (sv)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/Whistler_radio_palmer_2004-07-23_T035528.png
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