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Mlynarczyk J.,AGH University of Science and Technology | Bor J.,Hungarian Academy of Sciences | Kulak A.,AGH University of Science and Technology | Popek M.,AMSos | Kubisz J.,Jagiellonian University
Journal of Geophysical Research A: Space Physics | Year: 2015

We present an extraordinary case of sprites in rapid succession-four sprite clusters in only 400ms-followed by a secondary jet. Simultaneous ELF and optical observations, as well as lightning data, enabled us to thoroughly document this unique event. Locations of the transient luminous events (TLEs) were triangulated using video recordings from Nydek (Czech Republic) and Sopron (Hungary). We found that sprites were displaced up to 70km from their parent lightning. The current moment waveform and charge moment changes associated with the event were reconstructed from the ELF electromagnetic signature recorded at the Hylaty station (Poland) by a new method. The results suggest that both a short-delayed and a long-delayed sprite were generated by a single positive cloud-to-ground discharge that had an intense continuing current. It had an unusual progression and lasted 200ms. A large increase in the current moment during the development of a massive carrot sprite provides evidence in favor of sprite current. Our results also support the formation of an electric environment hypothesized to be necessary for the generation of the secondary TLEs. ©2015. American Geophysical Union. Source


Mlynarczyk J.,AGH University of Science and Technology | Bor J.,Hungarian Academy of Sciences | Kulak A.,AGH University of Science and Technology | Kulak A.,Jagiellonian University | And 2 more authors.
Journal of Geophysical Research A: Space Physics | Year: 2015

We present an extraordinary case of sprites in rapid succession - four sprite clusters in only 400 ms - followed by a secondary jet. Simultaneous ELF and optical observations, as well as lightning data, enabled us to thoroughly document this unique event. Locations of the transient luminous events (TLEs) were triangulated using video recordings from Nydek (Czech Republic) and Sopron (Hungary). We found that sprites were displaced up to 70 km from their parent lightning. The current moment waveform and charge moment changes associated with the event were reconstructed from the ELF electromagnetic signature recorded at the Hylaty station (Poland) by a new method. The results suggest that both a short-delayed and a long-delayed sprite were generated by a single positive cloud-to-ground discharge that had an intense continuing current. It had an unusual progression and lasted 200 ms. A large increase in the current moment during the development of a massive carrot sprite provides evidence in favor of sprite current. Our results also support the formation of an electric environment hypothesized to be necessary for the generation of the secondary TLEs. ©2015. American Geophysical Union. All Rights Reserved. Source

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