Wave diagnostics for the upstream interval 05:45–07:13 UT on 2023 March 13. Panels (a1)–(a4) (left column) and (b1)–(b4) (right column) are time–frequency spectrograms over the full interval; panels (c1)–(c3) (bottom row) are ﹩{B}_{w}^{2}﹩-weighted occurrence maps in (θ_kB, f) integrated over the inner foreshock (06:15–07:13 UT). (a1) Wavelet magnetic wave amplitude B_w (nT). (a2) Signed ellipticity ϵ (positive for right-hand, negative for left-hand). (a3) ∣ϵ∣. (a4) Propagation angle θ_kB between the minimum-variance direction and the local mean field (deg). (b1) Spacecraft-frame phase velocity V_φ = 2πf/k (km s⁻¹). (b2) Signed shock-normal Poynting flux S_n (au). (b3) Magnetic compressibility C_B. (b4) Density–field cross-phase Φ(δn, δ∣B∣) (deg). (c1) RH occurrence map (ϵ ≥ +0.7). (c2) LH occurrence map (ϵ ≤ −0.7). (c3) LP occurrence map (∣ϵ∣ ≤ 0.3).