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The knowledge about the relative timing of events during the substormexpansion phase onset is very important for understanding the physics ofsubstorms. In this work ground-based television (TV) imaging technique wasused for observations of the first auroral arc brightening near zenithof TV chamber for the case of an isolated substorm. The method of the TVimage filtration was used giving the possibility to analyze motion of subvisual auroral arcs. The analysis of the connection between the firstauroral arc brightening and the beginning of magnetic disturbance wascarried out. It was shown that luminosity disturbance is absent to the poleof breakup arc before the breakup and there exist a delay time between thebrightening and start of intense magnetic fluctuations in the Pi1–Pi2frequency ranges. The results obtained have been compared with predictionsof theories of auroral breakup

Features of auroral breakup obtained using data of ground-based television observations: case study