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DOI | 10.1002/2017GL072715 |
Properties of suprathermal electrons associated with discrete auroral arcs | |
Ogasawara, K.1; Livadiotis, G.1; Grubbs, G. A.2; Jahn, J. -M.1; Michell, R.2; Samara, M.2; Sharber, J. R.1; Winningham, J. D.1 | |
2017-04-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We report on the properties of suprathermal electrons observed over three discrete auroral arcs from a sounding rocket. By applying shifted kappa distributions and analyzing kappa parameters (density, temperature, and kappa), we found three novel characteristics to provide clues to understand the auroral acceleration mechanisms and magnetosphere-ionosphere coupling processes. First, the auroral potential drop was proportional to the inverse square of kappa, consistent with previous theoretical investigations by Dors and Kletzing (1999). The observed dependency was slightly stronger than their calculations, suggesting additional contributions from nonlinear plasma processes. Second, the polytropic relation showed nonadiabatic (near isothermal) state of the source electrons. This can provide a restriction on the pressure balance issues in the plasma sheet convection. Third, there was a clear difference in the polytropic and kappa indices for the first arc as opposed to the second and the third arcs, suggesting different source locations in the plasma sheet for the precipitating electrons that cause these nearby arcs. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401847500006 |
WOS关键词 | CENTRAL PLASMA SHEET ; CURRENT-VOLTAGE RELATIONSHIP ; PARTICLE-PRECIPITATION ; KAPPA-DISTRIBUTIONS ; SATELLITE-OBSERVATIONS ; EARTHS MAGNETOTAIL ; ROCKET OBSERVATION ; POLYTROPIC INDEX ; DOUBLE-LAYERS ; QUIET |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/25799 |
专题 | 气候变化 |
作者单位 | 1.Southwest Res Inst, San Antonio, TX 78227 USA; 2.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA |
推荐引用方式 GB/T 7714 | Ogasawara, K.,Livadiotis, G.,Grubbs, G. A.,et al. Properties of suprathermal electrons associated with discrete auroral arcs[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(8). |
APA | Ogasawara, K..,Livadiotis, G..,Grubbs, G. A..,Jahn, J. -M..,Michell, R..,...&Winningham, J. D..(2017).Properties of suprathermal electrons associated with discrete auroral arcs.GEOPHYSICAL RESEARCH LETTERS,44(8). |
MLA | Ogasawara, K.,et al."Properties of suprathermal electrons associated with discrete auroral arcs".GEOPHYSICAL RESEARCH LETTERS 44.8(2017). |
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