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Asymmetric auroral intensities in the Earth’s Northern and Southern hemispheres

beimu1009 添加于 2009-7-28 20:55 | 1384 次阅读 | 0 个评论

作者
Laundal KM, Østgaard N
摘要
It is commonly assumed that the aurora borealis (Northern Hemisphere) and aurora australis (Southern Hemisphere) are mirror images of each other because the charged particles causing the aurora follow the magnetic field lines connecting the two hemispheres. The particles are believed to be evenly distributed between the two hemispheres, from the source region in the equatorial plane of the magnetosphere. Although it has been shown that similar auroral features in the opposite hemispheres can be displaced tens of degree in longitude1, 2 and that seasonal effects can cause differences in global intensity3, 4, the overall auroral patterns were still similar. Here we report observations that clearly contradict the common assumption about symmetric aurora: intense spots are seen at dawn in the Northern summer Hemisphere, and at dusk in the Southern winter Hemisphere. The asymmetry is interpreted in terms of inter-hemispheric currents related to seasons, which have been predicted5, 6 but hitherto had not been seen.
详细资料
- 文献种类: Journal Article
- 期刊名称: Nature
- 期刊缩写: Nature
- 期卷页: 2009年第460卷第7254期 491-493页
- ISBN: 0028-0836
学科领域自然科学 » 物理学
标签

hemisphere
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