Fine structure of auroras during auroral breakup according to the ground-based and satellite observations

Autor: T. A. Kornilova, Elizaveta Antonova, O. I. Kornilov, I. A. Kornilov
Rok vydání: 2008
Předmět:
Zdroj: Geomagnetism and Aeronomy. 48:7-19
ISSN: 1555-645X
0016-7932
DOI: 10.1134/s0016793208010027
Popis: The dynamics and fine structure of auroras before and during 60 auroral breakups, including pseudobreakups and breakups at moderate and high auroral activity, have been studied using the developed method for processing television images. The IMAGE and POLAR satellite and simultaneous ground images of auroras, ground magnetic data, and measurements of IMF and solar wind plasma parameters have been analyzed. The signatures that can be precursors of breakup have been found out in the auroral dynamics and morphology in the spatial—temporal vicinity of breakup. The morphological characteristics of auroral structures have been analyzed statistically. The directions of motion of weak subvisual structures have been determined. The velocities of motion of such structures are presented. The relation of the initial auroral arc bright-ening during breakups and pseudobreakups to the beginning of magnetic activation and formation of rayed structures has been analyzed.
Databáze: OpenAIRE
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