Erupting flux rope seen as a hot channel structure with a central dark cavity in EUV and SXR. (a)–(d) Eruption seen in the SDO/AIA EUV 131 Å passband (shown in reverse grayscale) with dynamic features enhanced using the unsharp mask technique. This passband is sensitive to ∼10 MK plasma. The hot channel structure features a bright core that later develops into a teardrop-shaped cavity. Multiple strands are present at both sides of the cavity (marked by short arrows), interpreted as the flux rope legs connecting to both the northern and southern footpoints (circles; identified from the preeruption filament shown in Figure 1). (e)–(h) The same eruption observed by Hinode/XRT’s Al-Poly passband in SXR, which has a peak response of ∼8 MK. (i)–(l) Emission measure maps of hot plasma at 9–11 MK, derived from six SDO/AIA EUV passband images at 94, 131, 171, 193, 211, and 335 Å.