Features of auroral breakup obtained using data of ground-based television observations: case study
The knowledge about the relative timing of events during the substorm expansion phase onset is very important for understanding the physics of substorms. In this work ground-based television (TV) imaging technique was used for observations of the first auroral arc brightening near zenith of TV c...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2009-04-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/1413/2009/angeo-27-1413-2009.pdf |
| Summary: | The knowledge about the relative timing of events during the substorm
expansion phase onset is very important for understanding the physics of
substorms. In this work ground-based television (TV) imaging technique was
used for observations of the first auroral arc brightening near zenith
of TV chamber for the case of an isolated substorm. The method of the TV
image filtration was used giving the possibility to analyze motion of sub
visual auroral arcs. The analysis of the connection between the first
auroral arc brightening and the beginning of magnetic disturbance was
carried out. It was shown that luminosity disturbance is absent to the pole
of breakup arc before the breakup and there exist a delay time between the
brightening and start of intense magnetic fluctuations in the Pi1–Pi2
frequency ranges. The results obtained have been compared with predictions
of theories of auroral breakup. |
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| ISSN: | 0992-7689 1432-0576 |