ICON ion parameters of (a) ion density N_i, and (b) computed absolute value of residual ion density |∆N_i|, identifying irregularity events for Track 15575 on 2022-08-17. Time at the midpoint of shown track segment is 20:50 UTC. The black dotted line in panel (b) is the threshold of |∆N_i| used for irregular event detection. The yellow shaded sections refer to the irregularity events detected and lasting for 20 s along this satellite track, and the segment later used for investigation is shaded in reddish color.