气候变化领域集成服务门户(CCPortal): Explicit IMF By Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons

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DOI	10.1029/2019GL086676
	Explicit IMF By Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons
	Holappa L.; Asikainen T.; Mursula K.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	The most important driver of geomagnetic activity is the north–south (Bz) component of the interplanetary magnetic field (IMF), which dominates the solar wind-magnetosphere coupling and all solar wind coupling functions. While the east–west (By) 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 By > 0 than for By < 0 in Northern Hemisphere winter. In Southern Hemisphere winter, the dependence on the (Formula presented.) 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 By 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. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Ionosphere; Magnetosphere; Solar wind; Energetic particles; Geomagnetic activities; Interplanetary magnetic fields; Ionospheric conductivity; National Oceanic and Atmospheric Administration; Polar-orbiting operational environmental satellites; Solar wind-magnetosphere coupling; Space weather; Geomagnetism; electrojet; electron; geomagnetic field; ionosphere; magnetic field; magnetosphere; NOAA satellite; Northern Hemisphere; precipitation (climatology); satellite altimetry; solar wind; Southern Hemisphere; weather
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170656
作者单位	ReSoLVE Centre of Excellence, Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
推荐引用方式 GB/T 7714	Holappa L.,Asikainen T.,Mursula K.. Explicit IMF By Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons[J],2020,47(4).
APA	Holappa L.,Asikainen T.,&Mursula K..(2020).Explicit IMF By Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons.Geophysical Research Letters,47(4).
MLA	Holappa L.,et al."Explicit IMF By Dependence in Geomagnetic Activity: Modulation of Precipitating Electrons".Geophysical Research Letters 47.4(2020).