| Spectral
Analysis of Flux Variation |
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| • | Cause
of time variability |
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| – | Elementary
flare bursts (de Jager) |
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| – | Sub-second
structures à magnetic islands in |
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| current
sheet |
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| – | Current-loop
coalescence (Sakai) |
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| – | LRC-circuit
(Zaitsev) |
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| • | Quasi-periodic
intensity oscillation |
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| à Quasi-periodic acceleration or |
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| modulation by loop oscillation |
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