Luminosity variations in several parallel auroral arcs before auroral breakup
Variation of the luminosity in two parallel auroral arcs before auroral breakup has been studied by using digitised TV-data with high temporal and spatial resolution. The intervals when a new arc appears near already existing one were chosen for analysis. It is shown, for all cases, that the app...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1997-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/15/959/1997/angeo-15-959-1997.pdf |
| Summary: | Variation of the luminosity in two parallel
auroral arcs before auroral breakup has been studied by using digitised TV-data
with high temporal and spatial resolution. The intervals when a new arc appears
near already existing one were chosen for analysis. It is shown, for all cases,
that the appearance of a new arc is accompanied by fading or disappearance of
another arc. We have named these events out-of-phase events, OP. Another type of
luminosity variation is characterised by almost simultaneous enhancement of
intensity in the both arcs (in-phase event, IP). The characteristic time of IP
events is 10–20 s, whereas OP events last about one minute. Sometimes
out-of-phase events begin as IP events. The possible mechanisms for OP and IP
events are discussed. |
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| ISSN: | 0992-7689 1432-0576 |