Example of the rapid oscillation in frequency of the stripes. Top panel: ZPs observed on 14 Mar., 2015, at 21:47:00–21:57:00 UT in the frequency range 12–20 MHz. Bottom panels: zoomed part (21:53:57–21:54:10.5 UT and 12–17 MHz) of the radio spectrum. Each consecutive zebra stripe is shifted by 1–2 pixels, or 100–200 ms, relative to the next stripe at lower frequency.
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