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DOI | 10.1029/2020GL087391 |
The Photoelectron-Driven Upper Hybrid Instability as the Cause of 150-km Echoes | |
Longley, William J.1,2; Oppenheim, Meers M.3; Pedatella, Nick M.4; Dimant, Yakov S.3 | |
2020-04-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | 150 kilometer echoes are strong, coherent echoes observed by equatorial radars looking close to perpendicular to Earth's magnetic field. Observations over a day show a distinct necklace pattern with echoes descending from 170 km at sunrise to 130 km at noon, before rising again and disappearing overnight. This paper shows that the upper hybrid instability will convert photoelectron energy into plasma wave energy through inverse Landau damping. Using parameters from a WACCM-X simulation, the upper hybrid wave growth rates over a day show a nearly identical necklace pattern, with bands of positive growth rate following contours of the plasma frequency. Small gaps in altitude with no echoes are explained by thermal electrons Landau damping the instability where the upper hybrid frequency is a multiple of the gyrofrequency. This theory provides a mechanism that likely plays a crucial role in solving a long-standing mystery on the origin of 150-km echoes. |
英文关键词 | 150 km echoes radar valley region ionosphere plasma instability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000530332600011 |
WOS关键词 | REGION ; RADAR |
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/279850 |
专题 | 气候变化 |
作者单位 | 1.Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA; 2.Univ Corp Atmospher Res, Boulder, CO 80301 USA; 3.Boston Univ, Ctr Space Phys, Boston, MA 02215 USA; 4.Natl Ctr Atmospher Res, High Altitude Observ, Pob 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Longley, William J.,Oppenheim, Meers M.,Pedatella, Nick M.,et al. The Photoelectron-Driven Upper Hybrid Instability as the Cause of 150-km Echoes[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(8). |
APA | Longley, William J.,Oppenheim, Meers M.,Pedatella, Nick M.,&Dimant, Yakov S..(2020).The Photoelectron-Driven Upper Hybrid Instability as the Cause of 150-km Echoes.GEOPHYSICAL RESEARCH LETTERS,47(8). |
MLA | Longley, William J.,et al."The Photoelectron-Driven Upper Hybrid Instability as the Cause of 150-km Echoes".GEOPHYSICAL RESEARCH LETTERS 47.8(2020). |
条目包含的文件 | 条目无相关文件。 |
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