Extended Data Fig. 1: Spacetime maps of several spectral lines during the 23rd March 2024 microflare sources observed by SPICE.

H I Lyβ (T ≈ 10 kK; top left), S III 101.249 nm (T ≈ 50 kK; top right), O VI 103.761 nm (T ≈ 280 kK; middle left), C III 97.702 nm (T ≈ 70 kK; middle right), Ne VIII 77.043 nm (T ≈ 630 kK; bottom left), and Fe XX 72.156 nm (T ≈ 10 MK; bottom right). Spectra were integrated in wavelength over the range quoted on each panel, with continuum subtracted only for Ne VIII and Fe XX. Saturation is present in the C III image. The strong, transient flare ribbon appears at Solar-Y ≈ -252”, the weaker ribbon appears at Solar-Y ≈ -285”, and the hot loops from the main M flare are present around Solar-Y ≈ [-190,-170]”. The colour tables have been saturated to highlight both the strong and weak ribbon sources. Note that a -50” offset has been applied to SPICE’s solar-Y pointing information.