X-ray Emissions in a Multiscale Fluid Model of a Streamer Discharge

dc.bibliographicCitation.firstPage6935
dc.bibliographicCitation.issue13
dc.bibliographicCitation.journalTitleJournal of Geophysical Research: Atmospheres
dc.bibliographicCitation.lastPage6953
dc.bibliographicCitation.volume123
dc.contributor.authorLehtinen, Nikolai G.
dc.contributor.authorØstgaard, Nikolai
dc.date.accessioned2025-01-28T08:47:33Z
dc.date.available2025-01-28T08:47:33Z
dc.date.issued2018
dc.description.abstractWe use a three-specie fluid model of electric discharge in air to simulate streamer evolution from the avalanche-to-streamer transition to the collision of opposite-polarity streamers. We estimate the upper limit on the production of thermal runaway electrons, which is dominant during the second of these processes. More thermal runaways are produced if the ionization due to natural background and photoionization is reduced, due to possibility of creation of higher electric fields at streamer tips. The test-particle simulation shows, however, that these thermal runaway electrons have insufficient energies to become relativistic runaways. The simulations are done in constant uniform background fields of E0=4 and 6 MV/m. A simulation was also performed in E0=2 MV/m after formation of streamers in 4-MV/m field, in order to approximate the average background field created by ∼1-MV voltage over a ∼1-m electrode gap used in laboratory spark experiments. We conclude that the used fluid model is insufficient to explain X-ray observations during such experiments. We discuss the possible role of mechanisms which were not included in this or previous modeling but may play the deciding role in the electron acceleration and X-ray production during a streamer collision.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/18532
dc.identifier.urihttps://doi.org/10.34657/17552
dc.language.isoeng
dc.publisherHoboken, NJ : Wiley
dc.relation.doihttps://doi.org/10.1029/2018jd028646
dc.relation.essn2169-8996
dc.relation.issn2169-897X
dc.rights.licenseCC BY-NC-ND 4.0 Unported
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0
dc.subject.ddc550
dc.subject.otheradaptive mesh refinementeng
dc.subject.otherelectric discharge modeleng
dc.subject.otherrunaway electronseng
dc.subject.otherstreamer collisioneng
dc.subject.otherterrestrial gamma ray flasheng
dc.titleX-ray Emissions in a Multiscale Fluid Model of a Streamer Dischargeeng
dc.typeArticle
dc.typeText
tib.accessRightsopenAccess
wgl.contributorINP
wgl.subjectGeowissenschaftenger
wgl.typeZeitschriftenartikelger
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