(covers information from several alternate timelines)
The plasma storms of the Badlands
Planetary plasma storm
A plasma storm is a type of spatial disturbance that involves energetic particles in a state called plasma. Plasma storms were commonly found in places such as the Badlands. (DS9: "The Maquis, Part I", "For the Cause", "Blaze of Glory", "Penumbra"; VOY: "Caretaker")
A plasma storm swept through the Denorios Belt on stardate 47182.1. As of then, they were considered extremely rare, according to Jadzia Dax. (DS9: "Invasive Procedures")
Occurrences of plasma storms apparently became more frequent by 2373. While trying to figure out what had happened to a group of officers who encountered a type 2 plasma storm on their way back to Deep Space 9, Doctor Julian Bashir did a search in the medical files about such a phenomenon and found 5,021 entries. (DS9: "Things Past")
Professor Jennifer Sisko was working on a transpectral sensor array, a device that might have been able to penetrate the plasma storms, in an effort to find hidden Terran Rebellion bases in 2371 in the mirror universe. Sisko halted work on the device when she defected to the Rebellion after being persuaded to do so by Commander Benjamin Sisko. (DS9: "Through the Looking Glass")
In 2372, a plasma storm hit the planet New Earth, on which Captain Kathryn Janeway and Commander Chakotay were marooned due to a viral infection. The storm wrecked their scientific equipment and Janeway's insect traps, putting an end to her research to try to find a cure for the infection. (VOY: "Resolutions")