| DOI: | 10.1002/grl.50408
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| 论文题名: | Sprites in low-frequency radio noise |
| 作者: | Füllekrug M.; Mezentsev A.; Soula S.; Van Der Velde O.; Farges T.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9091
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| EISSN: | 1944-8822
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| 出版年: | 2013
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| 卷: | 40, 期:10 | | 起始页码: | 2395
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| 结束页码: | 2399
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| 语种: | 英语
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| 英文关键词: | lightning
; low-frequency radio noise
; sprite
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| Scopus关键词: | Background radiation
; Discharge process
; Electric field strength
; Electron multiplication
; Exponential growth
; Radio noise
; sprite
; Sprite luminosities
; Digital radio
; Electric fields
; Electromagnetism
; Lightning
; Luminance
; Radiation
; Radio astronomy
; electromagnetic field
; frequency analysis
; luminescence
; noise
; radiation balance
; thundercloud
; videography
|
| 英文摘要: | Low-frequency radio noise is the electromagnetic background radiation which is compared here to the luminosity of 39 sprites recorded with a low-light video camera. It is found that the sprite luminosities coincide with ∼10-30 ms long sudden enhancements of the electromagnetic background radiation ∼6-8 μV m-1Hz-1/2(∼6-9 dB) with a relative maximum near ∼125 kHz as measured with a wideband (∼1-400 kHz) digital radio receiver. The sprites cluster in 10 groups of 2-5 consecutive sprites which are paralleled by up to ∼1 s long slowly varying enhancements of the electromagnetic background radiation ∼4-5 μV m-1Hz -1/2(∼2-4 dB). The observed electric field strengths place an upper bound on the low-frequency radiation from the electron multiplication associated with the exponential growth and branching sprite streamers predicted by Qin et al. [2012a]. This upper bound corresponds to a maximum of ∼300-5000 sprite streamers at ∼40 km height above thunderclouds. Some part of the observed electromagnetic background radiation might result from the superposition of low-frequency radiation emanating from the quick succession of numerous horizontal lightning strokes and/or stepped leaders inside thunderclouds which would constitute a fundamentally novel quasi-static discharge process inside thunderclouds radiating slowly varying low frequency radio noise. © 2013 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879938409&doi=10.1002%2fgrl.50408&partnerID=40&md5=2811e35114fe713cab5e4db5350121ac
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6355
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Electronic and Electrical Engineering, Centre for Space and Atmospheric Science, University of Bath, Bath, United Kingdom
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| Recommended Citation: | |
Füllekrug M.,Mezentsev A.,Soula S.,et al. Sprites in low-frequency radio noise[J]. Geophysical Research Letters,2013-01-01,40(10).
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