New Scientist has an update on the so-called "gigantic jets" first discovered in 2003 — these are lightning bolts that reach from cloud tops upward into the ionosphere, as high as 90 kilometers. (There's a video at the link.) What's new is that researchers from Duke University have managed to measure the electrical discharge from a gigantic jet and confirm that they carry as much energy skyward as ordinary lightning strikes carry to the ground. According to the article, "Gigantic jets are one of a host of new atmospheric phenomena discovered in recent years. Other examples are sprites and blue jets."