𝒮_phot is shown in light blue in the lower part of each panel, along with the detected high-energy peaks marked by dark blue crosses. For better clarity, the full 27-year time series is divided into three panels (from top to bottom). For each peak, when it corresponds to a peak in σ_phot (resp. in 𝒞_phot or in 𝒮_vel), within a window of δt = 1.45 days, a red (resp. pink or brown) circle highlights it in the top light beige area of each panel. Similarly, when at least one X-class flare (or one CME) occurred within the δt-window around the peak, it is marked by an orange (or green) circle. Peaks not coinciding with any of these events are marked by violet circles. Furthermore, if a peak is detected within one of the three defined frequency bands, it is highlighted with a black marker: a square for low frequencies, a star for medium frequencies, and a triangle for high frequencies. Gaps due to the SoHO recovery mission are represented as grey shaded areas. Minor ticks represent months.