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Sporadic E (usually abbreviated Es) is an unusual form of radio propagation using a low level of the Earth's ionosphere that normally does not refract radio waves. Sporadic E propagation reflects signals off relatively small "clouds" in the lower E region located at altitudes of about 95~150 km (50~100 miles). These "clouds" are composed of ionized metals ablated off micrometeoroids. Whereas E layer propagation depends on the temporary abundance of metallic meteor dust, the more conventional forms of skywave propagation in the ionosphere's higher F region refract off layers of electrons knocked off of gasses by intense UV light, which are renewed on a fairly regular daily cycle. In both cases, the ionized material, when present, refracts (or "bends") radio signals back toward the Earth's s

AttributesValues
rdfs:label
  • Sporadic-E (de)
  • E sporadico (it)
  • Propagation sporadique E (fr)
  • スポラディックE層 (ja)
  • Sporadic E propagation (en)
  • Camada E Esporádica (pt)
  • 偶发E层传播 (zh)
rdfs:comment
  • La propagation sporadique E est une forme de propagation ionosphérique des ondes radio par réflexion sur des couches sporadiques notées Es, situées dans la région E de l'ionosphère. (fr)
  • E Sporadico o Es è una rara forma di radiopropagazione che utilizza le caratteristiche della ionosfera terrestre. Considerando che la maggior parte delle forme di propagazione skywave si avvalgono delle proprietà di ionizzazione normale e ciclico dello strato F della ionosfera, situato tra i 130 e 450 km, per riflettere o curvare nuovamente segnali radio verso la superficie della Terra, la propagazione E sporadica, rimbalza i segnali radio tramite piccole nubi di gas atmosferico insolitamente ionizzato nello strato E, regione della ionosfera più bassa e adiacente allo strato F, che si estende tra i 90 a 130 km. Questo permette la comunicazione sporadica e a lunga distanza su frequenze VHF, in genere non adatte a tale tipo di comunicazione. (it)
  • スポラディックE層（スポラディックイーそう、Es層、略称はEスポ、または、Es、英語：Sporadic E layer）とは、春から夏ごろにかけて、主に昼間に上空約100km付近に局地的・突発的（スポラディック）に発生する特殊な電離層である。 Eスポの電子密度が極度に高い場合は、F層でも反射できないVHF（Very High Frequency）帯の電波をも反射するという特殊な性質がある。 (ja)
  • A camada E esporádica tem a particularidade de ficar mais ativa no verão e em condições em que o ciclo solar (que se repete a cada 11 anos aproximadamente) estiverem propícias.Quanto mais perpendiculares são os raios solares que incidem sobre a ionosfera maiores serão as probabilidades de aparição da E esporádica. (pt)
  • 偶发E层传播（英語：Sporadic E propagation）是超短波（尤其是VHF波段）在电离层的偶发E层（又称Es层）上的反射和散射传播，利用Es层可以实现数千公里的超短波超视距通信。 (zh)
  • Als sporadische E-Schicht (Sporadic-E, Es) werden wolkenartige Gebiete hoher Ionisierung in der Ionosphäre in Höhe der E-Schicht bezeichnet. Die sporadische E-Schicht tritt unregelmäßig und nicht vorhersehbar auf, allerdings vorzugsweise in den Monaten Mai bis Juli (in der nördlichen Hemisphäre) und tagsüber, also zu Zeiten von allgemein relativ hoher Ionisierung. Als Ursache für die Es-Bildung werden Windscherungen in der entsprechenden Höhe und Metalleinträge durch Meteore diskutiert. Die Auswirkungen auf den Kurzwellen-Funkverkehr sehen wie folgt aus: (de)
  • Sporadic E (usually abbreviated Es) is an unusual form of radio propagation using a low level of the Earth's ionosphere that normally does not refract radio waves. Sporadic E propagation reflects signals off relatively small "clouds" in the lower E region located at altitudes of about 95~150 km (50~100 miles). These "clouds" are composed of ionized metals ablated off micrometeoroids. Whereas E layer propagation depends on the temporary abundance of metallic meteor dust, the more conventional forms of skywave propagation in the ionosphere's higher F region refract off layers of electrons knocked off of gasses by intense UV light, which are renewed on a fairly regular daily cycle. In both cases, the ionized material, when present, refracts (or "bends") radio signals back toward the Earth's s (en)
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