Observed Sprite Streamer Growth Rates

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
H. C. Stenbaek-Nielsen, M. G. McHarg, N. Y. Liu
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引用次数: 0

Abstract

Sprites have been recorded at ∼100,000 frames per second. One hundred and sixty five essentially vertically propagating streamers, 110 downward and 55 upward, have been selected for analysis. The initial velocity increase is exponential as predicted by theory. Growth rates could be determined for 76 downward and 46 upward propagating streamers, and, in individual streamers, they are independent of altitude. The average growth rate increases from 1.6 103 in C-sprites, to 2.6 103 in carrots, to 8.4 103/s in jellyfish sprites. With a streamer model the driving electric field can be derived. Evaluating the field at 70 km altitude, we find fields of 98 (0.45 Ek), 121 (0.56 Ek), and 188 (0.87 Ek) V/m for the 3 sprite types, indicating that jellyfish sprites are the most energetic. High-speed imaging can provide streamer growth rates and combined with a streamer model, the electric fields associated with various sprite features can be investigated.

Abstract Image

观察到Sprite Streamer的增长率
精灵以每秒10万帧的速度被记录下来。165条基本垂直传播的拖缆,110条向下,55条向上,被选中进行分析。初速度的增加与理论预测的一样呈指数增长。76条向下传播的飘带和46条向上传播的飘带的生长速率可以确定,并且在单个飘带中,它们与海拔无关。平均生长速率从c精灵的1.6 103/s,到胡萝卜的2.6 103/s,到水母精灵的8.4 103/s。利用拖缆模型可以推导出驱动电场。在海拔70 km处,三种精灵的能量场分别为98 (0.45 Ek)、121 (0.56 Ek)和188 (0.87 Ek) V/m,表明水母精灵能量最高。高速成像可以提供流光的生长速率,并结合流光模型,可以研究与各种精灵特征相关的电场。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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