Examples of ionograms recorded at Průhonice station during daytime (08–11 UT) on 25 August (a–c), on 26 August (d–f) and on 27 August (g–i). F traces without TID signatures (white in Table 3) are shown in Figures 8a and 8c, while weak TID signatures which affect <0.5 and 0.5 < f < 1.5 MHz frequency range are seen on plots b, d, e and f respectively (pale orange colours in Table 3). Very distorted ionograms (essentially the whole observed F trace is affected) are seen on plots g–i. All times are given in UT.