Luminosity variations in several parallel auroral arcs before auroral breakup

Details Luminosity variations in several parallel auroral arcs before auroral breakup Luminosity variations in several parallel auroral arcs before auroral breakup

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997angeo..15..959s&link_type=abstract

Annales Geophysicae, vol. 15, Issue 8, pp.959-966

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6

Scientific paper

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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