SPRITES ABOVE HURRICANE MATTHEW: On Oct. 1st, Earth weather met space weather above Hurricane Matthew. As the giant storm system was approaching the Greater Antilles, Frankie Lucena of Puerto Rico photographed red sprites shooting up from the thunderclouds:
Sprites are a strange and beautiful form of lightning that shoot up from the tops of electrical storms. They reach all the way up to the edge of space alongside meteors, auroras, and noctilucent clouds. Some researchers believe cosmic rays help trigger sprites, making them a true space weather phenomenon.
Seeing sprites above a hurricane is rare. Many hurricanes don't even have regular lightning because the storms lack a key ingredient for electrical activity: vertical winds. (For more information read the Science@NASA article "Electric Hurricanes.") But Matthew is not a typical hurricane. It's one of the most powerful in recent years, briefly reaching Category 5 at about the time Lucena photographed the sprites. Perhaps extra-strong winds in the vicinity of the storm set the stage for upward-reaching bolts.