Example of FF IP shock observed by SolO on 2023 February 21. (a) Magnetic field magnitude, (b) proton bulk speed, and (c) proton density and differential ion energy flux. (d) Illustration of 1 minute sliding computation intervals in upstream (subscript “u”) and downstream (subscript “d”) within ±85 s of the shock passage. Blue (red) shaded regions mark the nearest upstream (downstream) interval. (e) Magnetic field spectra for 10 minute intervals at up- and downstream, including the MAG instrument transition range noise floor (see green solid and dashed lines). Gray dashed lines with asterisks indicate the fitted slopes with spectral breaks. (f) A full set of power spectra within ±10 minutes of the shock crossing.