Volcanic Lightning in Eruptions of Sakurajima Volcano
In May 2015 a field program was undertaken to study volcanic lightning at the Sakurajima volcano in southern Japan. One of the main goals of the study was to gain a better understanding of small electrical discharges in volcanic eruptions, expanding on our earlier studies of volcanic lightning at Au...
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ftusouthflorida:oai:digitalcommons.usf.edu:geo_facpub-2676 2023-07-30T04:03:23+02:00 Volcanic Lightning in Eruptions of Sakurajima Volcano Edens, Harald E. Thomas, Ronald J. Behnke, Sonja A. McNutt, Stephen R. Smith, Cassandra M. Farrell, Alexandra Van Eaton, Alexa R. Cimarelli, Corrado Cigala, Valeria Eack, Ken Aulich, Graydon Michael, Christopher Miki, Daisuke Iguchi, Masato 2016-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/geo_facpub/1633 https://digitalcommons.usf.edu/context/geo_facpub/article/2676/viewcontent/EGU2016_11021.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/geo_facpub/1633 https://digitalcommons.usf.edu/context/geo_facpub/article/2676/viewcontent/EGU2016_11021.pdf http://creativecommons.org/licenses/by/3.0/ School of Geosciences Faculty and Staff Publications Earth Sciences presentation 2016 ftusouthflorida 2023-07-13T21:56:45Z In May 2015 a field program was undertaken to study volcanic lightning at the Sakurajima volcano in southern Japan. One of the main goals of the study was to gain a better understanding of small electrical discharges in volcanic eruptions, expanding on our earlier studies of volcanic lightning at Augustine and Redoubt volcanoes in Alaska, USA, and Eyjafjallajökull in Iceland. In typical volcanic eruptions, electrical activity occurs at the onset of an eruption as a near-continual production of VHF emissions at or near to the volcanic vent. These emissions can occur at rates of up to tens of thousands of emissions per second, and are referred to as continuous RF. As the ash cloud expands, small-scale lightning flashes of several hundred meters length begin to occur while the continuous RF ceases. Later on during the eruption larger-scale lightning flashes may occur within the ash cloud that are reminiscent of regular atmospheric lightning. Whereas volcanic lightning flashes are readily observed and reasonably well understood, the nature and morphology of the events producing continuous RF are unknown. During the 2015 field program we deployed a comprehensive set of instrumentation, including a 10-station 3-D Lightning Mapping Array (LMA) that operated in 10 µs high time resolution mode, slow and fast ∆E antennas, a VHF flat-plate antenna operating in the 20-80 MHz band, log-RF waveforms within the 60-66 MHz band, an infra-red video camera, a high-sensitivity Watec video camera, two high-speed video cameras, and still cameras. We give an overview of the Sakurajima field program and present preliminary results using correlated LMA, waveforms, photographs and video recordings of volcanic lightning at Sakurajima volcano. Conference Object Eyjafjallajökull Iceland Alaska University of South Florida St. Petersburg: Digital USFSP |
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Open Polar |
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University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Edens, Harald E. Thomas, Ronald J. Behnke, Sonja A. McNutt, Stephen R. Smith, Cassandra M. Farrell, Alexandra Van Eaton, Alexa R. Cimarelli, Corrado Cigala, Valeria Eack, Ken Aulich, Graydon Michael, Christopher Miki, Daisuke Iguchi, Masato Volcanic Lightning in Eruptions of Sakurajima Volcano |
topic_facet |
Earth Sciences |
description |
In May 2015 a field program was undertaken to study volcanic lightning at the Sakurajima volcano in southern Japan. One of the main goals of the study was to gain a better understanding of small electrical discharges in volcanic eruptions, expanding on our earlier studies of volcanic lightning at Augustine and Redoubt volcanoes in Alaska, USA, and Eyjafjallajökull in Iceland. In typical volcanic eruptions, electrical activity occurs at the onset of an eruption as a near-continual production of VHF emissions at or near to the volcanic vent. These emissions can occur at rates of up to tens of thousands of emissions per second, and are referred to as continuous RF. As the ash cloud expands, small-scale lightning flashes of several hundred meters length begin to occur while the continuous RF ceases. Later on during the eruption larger-scale lightning flashes may occur within the ash cloud that are reminiscent of regular atmospheric lightning. Whereas volcanic lightning flashes are readily observed and reasonably well understood, the nature and morphology of the events producing continuous RF are unknown. During the 2015 field program we deployed a comprehensive set of instrumentation, including a 10-station 3-D Lightning Mapping Array (LMA) that operated in 10 µs high time resolution mode, slow and fast ∆E antennas, a VHF flat-plate antenna operating in the 20-80 MHz band, log-RF waveforms within the 60-66 MHz band, an infra-red video camera, a high-sensitivity Watec video camera, two high-speed video cameras, and still cameras. We give an overview of the Sakurajima field program and present preliminary results using correlated LMA, waveforms, photographs and video recordings of volcanic lightning at Sakurajima volcano. |
format |
Conference Object |
author |
Edens, Harald E. Thomas, Ronald J. Behnke, Sonja A. McNutt, Stephen R. Smith, Cassandra M. Farrell, Alexandra Van Eaton, Alexa R. Cimarelli, Corrado Cigala, Valeria Eack, Ken Aulich, Graydon Michael, Christopher Miki, Daisuke Iguchi, Masato |
author_facet |
Edens, Harald E. Thomas, Ronald J. Behnke, Sonja A. McNutt, Stephen R. Smith, Cassandra M. Farrell, Alexandra Van Eaton, Alexa R. Cimarelli, Corrado Cigala, Valeria Eack, Ken Aulich, Graydon Michael, Christopher Miki, Daisuke Iguchi, Masato |
author_sort |
Edens, Harald E. |
title |
Volcanic Lightning in Eruptions of Sakurajima Volcano |
title_short |
Volcanic Lightning in Eruptions of Sakurajima Volcano |
title_full |
Volcanic Lightning in Eruptions of Sakurajima Volcano |
title_fullStr |
Volcanic Lightning in Eruptions of Sakurajima Volcano |
title_full_unstemmed |
Volcanic Lightning in Eruptions of Sakurajima Volcano |
title_sort |
volcanic lightning in eruptions of sakurajima volcano |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2016 |
url |
https://digitalcommons.usf.edu/geo_facpub/1633 https://digitalcommons.usf.edu/context/geo_facpub/article/2676/viewcontent/EGU2016_11021.pdf |
genre |
Eyjafjallajökull Iceland Alaska |
genre_facet |
Eyjafjallajökull Iceland Alaska |
op_source |
School of Geosciences Faculty and Staff Publications |
op_relation |
https://digitalcommons.usf.edu/geo_facpub/1633 https://digitalcommons.usf.edu/context/geo_facpub/article/2676/viewcontent/EGU2016_11021.pdf |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
_version_ |
1772814379557847040 |