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| Titel |
Model reduction for streamer discharges |
| VerfasserIn |
Alejandro Luque, Marta Gonzalez, Francisco José Gordillo-Vázquez |
| 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 |
250149141
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| Publikation (Nr.) |
 EGU/EGU2017-13466.pdf |
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| Zusammenfassung |
| An advancing lightning channel is composed of a hot, highly conductive core called leader
surrounded by a corona of many thin filaments called streamers where pristine air is turned
conductive by means of impact ionization. Understanding leader progression therefore
requires realistic models for the streamer corona and for the coupling between this corona and
the leader channel that feeds it. However, current streamer models are limited to a
few streamers and they cannot be extended to a full corona due to computational
limitations.
Here we discuss how the knowledge gained from streamer simulations in the past decades
can be used to develop simplified models of the streamer dynamics to serve as building
blocks for future corona models. We focus on a model where a streamer is represented as a
propagating, imperfect conductor with a prescribed shape. Within this one-dimensional,
simplified model we investigate streamer features such as the relationship between
channel conductivity and field enhancement at the tip. We also show that, since this
model can be followed up to long timescales of the order of the microsecond at
atmospheric pressure, it provides clues about channel heating and the streamer-to-leader
transition. |
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