Figure 8


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LOFAR S4 of CasA (a, b) and CygA (c, d) calculated respectively for days 271 and 275 of 2017, recorded on LOFAR station PL612. ROT values calculated for 1 s (e, f) and 60 s (g, h) for days 271 and 275 of 2017. GNSS S4 index observed on L1, L2 and L5 frequencies recorded with the ionospheric monitor collocated with the PL612 LOFAR station superimposed on CasA and CygA S4 index calculated for the 48.92 MHz channel (i, j).

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