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(Upper row of plots) Extracted from the COSMIC data 9-day zonally symmetric (s = 0) waves seen in the ionospheric parameters: foF2 (left plot) and hmF2 (right plot); (bottom row of plots) Phase difference between the ionospheric parameters foF2 and the PI (left plot) and between hmF2 and PI (right plot); the thick white line shows the zero phase difference (Mukhtarov & Pancheva 2012).
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