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| Titel |
Electromagnetic Signatures of European North Atlantic Winter Thunderstorms |
| VerfasserIn |
Ivana Kolmasova, Ondrej Santolik, Jiri Guth Jarkovsky, Radek Lan, Ludek Uhlir |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140351
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| Publikation (Nr.) |
 EGU/EGU2017-3725.pdf |
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| Zusammenfassung |
| We present results of three-component VLF measurements of unusual daytime tweek atmospherics, which we have recorded in a favorable electromagnetic environment on the summit of La Grande Montagne (1028 m, 43.9410N, 5.4836E), Plateau d'Albion, France in January 2015. The observed daytime tweek atmospherics have a clear frequency dispersion which we are able to analyze above the first ionospheric cutoff. We estimate model parameters of the characteristic frequency dispersion as a function of time. Using the obtained parameters we are able to evaluate the tweek reflection heights and propagation distances from their source lightning discharges. The three-component measurement allows us to estimate the arrival direction. The source lightning strokes of observed unusual daytime tweeks were found to originate in a sequence of severe winter thunderstorms which hit Ireland, the UK, Norway, Denmark, Germany, and Poland in January 2015. Based on our analysis we show that a thunderstorm occurring at higher latitudes of northern and north-western Europe during winter months is an ideal candidate for the source of tweeks, which could be observed unexpectedly during the day. |
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