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DOI | 10.1029/2019GL086676 |
Explicit IMF B-y Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons | |
Holappa, L.; Asikainen, T.; Mursula, K. | |
2020-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Finland |
英文摘要 | The most important driver of geomagnetic activity is the north-south (B-z) component of the interplanetary magnetic field (IMF), which dominates the solar wind-magnetosphere coupling and all solar wind coupling functions. While the east-west (B-y) IMF component is also included in most coupling functions, its effect is always assumed to be symmetric with respect of its sign. However, recent studies have shown that, for a fixed value of any coupling function, geomagnetic activity is stronger for B-y > 0 than for B-y < 0 in Northern Hemisphere winter. In Southern Hemisphere winter, the dependence on the By sign is reversed. In this paper, we use measurements of National Oceanic and Atmospheric Administration Polar-Orbiting Operational Environmental Satellites to show that the flux of magnetospheric electrons precipitating into the atmosphere also exhibits an explicit By dependence. This B-y dependence is strong in the midnight and dawn sectors where it causes a related By effect in the westward electrojet and geomagnetic activity by modulating ionospheric conductivity. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529120100046 |
WOS关键词 | MAGNETIC-FIELD ; ENERGY DEPOSITION ; DIPOLE TILT ; RECONNECTION ; FLUXES |
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/279670 |
专题 | 气候变化 |
作者单位 | Univ Oulu, ReSoLVE Ctr Excellence, Space Phys & Astron Res Unit, Oulu, Finland |
推荐引用方式 GB/T 7714 | Holappa, L.,Asikainen, T.,Mursula, K.. Explicit IMF B-y Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(4). |
APA | Holappa, L.,Asikainen, T.,&Mursula, K..(2020).Explicit IMF B-y Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons.GEOPHYSICAL RESEARCH LETTERS,47(4). |
MLA | Holappa, L.,et al."Explicit IMF B-y Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons".GEOPHYSICAL RESEARCH LETTERS 47.4(2020). |
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