Satellite imagery shows the “thermal signature” of the volcanic fissure that erupted on Iceland’s Reykjanes Peninsula on Monday, December 18.These satellite images, posted to X by the Cooperative Institute for Research in the Atmosphere (CIRA), were captured overnight into Tuesday.The volcano’s eruption size “continues to diminish” and the “lava flow is estimated to be about one-quarter of what it was at the beginning of the eruption,” the Icelandic Met Office said on Tuesday. Credit: CIRA/CSU & NOAA via Storyful