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DOI | 10.1029/2018JD028646 |
X-ray Emissions in a Multiscale Fluid Model of a Streamer Discharge | |
Lehtinen, Nikolai G.; Ostgaard, Nikolai | |
2018-07-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:13页码:6935-6953 |
文章类型 | Article |
语种 | 英语 |
国家 | Norway |
英文摘要 | We 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 E-0=4 and 6MV/m. A simulation was also performed in E-0=2MV/m after formation of streamers in 4-MV/m field, in order to approximate the average background field created by approximate to 1-MV voltage over a approximate to 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. |
英文关键词 | streamer collision electric discharge model terrestrial gamma ray flash adaptive mesh refinement runaway electrons |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439799300016 |
WOS关键词 | ELECTRIC-FIELD ; SIMULATION ; PROPAGATION ; COLLISIONS ; BREAKDOWN ; SPARKS ; GASES |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32695 |
专题 | 气候变化 |
作者单位 | Univ Bergen, Birkeland Ctr Space Sci, Bergen, Norway |
推荐引用方式 GB/T 7714 | Lehtinen, Nikolai G.,Ostgaard, Nikolai. X-ray Emissions in a Multiscale Fluid Model of a Streamer Discharge[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(13):6935-6953. |
APA | Lehtinen, Nikolai G.,&Ostgaard, Nikolai.(2018).X-ray Emissions in a Multiscale Fluid Model of a Streamer Discharge.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(13),6935-6953. |
MLA | Lehtinen, Nikolai G.,et al."X-ray Emissions in a Multiscale Fluid Model of a Streamer Discharge".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.13(2018):6935-6953. |
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