气候变化领域集成服务门户(CCPortal): Diffuse auroral precipitation driven by lower-band chorus second harmonics

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DOI	10.1038/s41467-023-36095-x
	Diffuse auroral precipitation driven by lower-band chorus second harmonics
	Yu, Xiongdong; Yuan, Zhigang; Yu, Jiang; Wang, Dedong; Deng, Dan; Funsten, H. O.
发表日期	2023
EISSN	2041-1723
卷号	14 期号:1 页码:9
英文摘要	Diffuse aurora at the Earth's high latitude regions is mainly caused by the low-energy (0.1-30 keV) electron precipitation which carries the major energy flux into the nightside upper atmosphere. Previous studies have demonstrated that combined scattering by the upper- and lower- band chorus waves acts as the dominant cause of diffuse auroral precipitation, but that is not necessarily the case as these two types of waves do not always occur simultaneously, with the lower-band more often. Here we report that the lower-band chorus satisfying the preferred condition can generate their second harmonics so as to trigger the diffuse auroral electron precipitation. We find that the lower-band chorus alone can only cause the precipitation of electrons greater than 4 keV, while the self-consistently generated second harmonic is weak but still able to result in the electron precipitation below 4 keV. The combined effect of those modes results in the observed pancake electron distributions and the diffuse aurora. Our results clearly demonstrate an alternative but universal mechanism of chorus-driven diffuse aurora in the Earth, which may also apply to the auroral formation in other planetary magnetospheres. Scattering by the upper- and lower-band chorus waves are the dominant cause of diffuse auroral precipitation. Here, the authors show that the lower-band chorus alone satisfies the preferred condition for the generation of second harmonics to trigger the diffuse auroral electron precipitation.
学科领域	Multidisciplinary Sciences
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS记录号	WOS:000923177700008
来源期刊	NATURE COMMUNICATIONS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/274023
作者单位	Wuhan University; Sun Yat Sen University; Helmholtz Association; Helmholtz-Center Potsdam GFZ German Research Center for Geosciences; United States Department of Energy (DOE); Los Alamos National Laboratory
推荐引用方式 GB/T 7714	Yu, Xiongdong,Yuan, Zhigang,Yu, Jiang,et al. Diffuse auroral precipitation driven by lower-band chorus second harmonics[J],2023,14(1):9.
APA	Yu, Xiongdong,Yuan, Zhigang,Yu, Jiang,Wang, Dedong,Deng, Dan,&Funsten, H. O..(2023).Diffuse auroral precipitation driven by lower-band chorus second harmonics.NATURE COMMUNICATIONS,14(1),9.
MLA	Yu, Xiongdong,et al."Diffuse auroral precipitation driven by lower-band chorus second harmonics".NATURE COMMUNICATIONS 14.1(2023):9.