Hemispheric asymmetry of subauroral ion drifts: Statistical results

	Hemispheric asymmetry of subauroral ion drifts: Statistical results
	Zhang, X. X.; F. He; W. B. Wang and B. Chen
	2015
发表期刊	Journal of Geophysical Research-Space Physics
卷号	120 期号:6 页码:4544-4554
摘要	A large database of more than 18,000 subauroral ion drift (SAID) events from DMSP observations from 1987 to 2012 is used to systematically investigate the features of SAID. SAID occurs mostly at similar to 62 degrees/-60 degrees magnetic latitude (MLAT) and similar to 22:15/22:45 magnetic local time (MLT) for geomagnetically quiet conditions and at similar to 58 degrees/-56 degrees MLAT and similar to 22:15/22:45 MLT for geomagnetically disturbed conditions in the North Hemisphere (NH)/South Hemisphere (SH), respectively. Significant north-south asymmetries in SAID occurrence, shape, and geomagnetic activity variations are found in this statistical study. The latitudinal width of a SAID is larger in the NH than in the SH. An interesting finding of this work is that the SAID occurrence probability peaks have an similar to 180 degrees difference in longitude between the two hemispheres in the geographic coordinates for both geomagnetically quiet and disturbed conditions. The SAID width peaks in almost the same geomagnetic meridian zone with a geomagnetic longitude of similar to 80 degrees-120 degrees in both hemispheres. Significant hemispheric asymmetries and spike signatures with sharp dips are found in all the latitudinal profiles of the horizontal velocities of SAIDs. The SAID is highly correlated to geomagnetic activity, indicating that the location and evolution of the SAID might be influenced by global geomagnetic activity, auroral dynamics, and the dynamics of ring currents.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55269
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhang, X. X.,F. He,W. B. Wang and B. Chen. Hemispheric asymmetry of subauroral ion drifts: Statistical results[J]. Journal of Geophysical Research-Space Physics,2015,120(6):4544-4554.
APA	Zhang, X. X.,F. He,&W. B. Wang and B. Chen.(2015).Hemispheric asymmetry of subauroral ion drifts: Statistical results.Journal of Geophysical Research-Space Physics,120(6),4544-4554.
MLA	Zhang, X. X.,et al."Hemispheric asymmetry of subauroral ion drifts: Statistical results".Journal of Geophysical Research-Space Physics 120.6(2015):4544-4554.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Hemispheric asymmetr（1195KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	浏览下载