Two-component auroras

J. H. Shue, P. T. Newell, K. Liou, C. I. Meng, Y. Kamide, R. P. Lepping

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


By examining Polar Ultraviolet Imager auroral images at the 160-180 nm N2 Lyman-Birge-Hopfield emission band, we find that the auroral dynamics associated with substorms shows a two-component feature. An auroral feature, which is called the two-cell aurora, is associated with the increased magnetospheric convection in response to a southward interplanetary magnetic field. A substorm expansion may then occur, adding an additional aurora in the midnight sector. As the substorm continuously increases its strength, the substorm aurora connects with the two-cell aurora, forming a well-defined crescent-shape aurora. It is also found that the occurrence rate of the two-cell aurora depends on universal time.

Original languageEnglish
Pages (from-to)17-1-17-4
JournalGeophysical Research Letters
Issue number10
StatePublished - 15 May 2002


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