A plasma field is ignited
A plasma field was an energetic plasma disruption located in the Badlands. These fields were quite extensive and made starship navigation very difficult. Sensors are also limited by plasma fields. (DS9: "Heart of Stone", "For the Cause", "For the Uniform")
The Denorios belt was a charged plasma field. (DS9: "Emissary")
The USS Defiant created a wake in the plasma fields of the Badlands, so much so that they were almost detectable, even under cloak. (DS9: "For the Cause")
While on their way back to the USS Enterprise-D in 2369, Geordi La Forge told Deanna Troi, Captain Picard, and Data about his experience to touch a plasma field at the psychological conference they had just visited. He described this as an amazing experience and explained that the plasma moved up onto his arm and was very warm, like "taking a bath in pure energy". (TNG: "Timescape")
In 2369 Benjamin Sisko and Kira Nerys detected elevated thoron emissions in the plasma field of Deep Space 9, suggesting it came from the high traffic in the area. (DS9: "If Wishes Were Horses")
A plasma field generated by a band of Jem'Hadar pulled Julian Bashir and Miles O'Brien's runabout onto the surface of Bopak III in 2372. (DS9: "Hippocratic Oath")
In 2373, Benjamin Sisko and Michael Eddington used the impulse exhaust of a Danube-class runabout to detonate a plasma field aft of them, hoping to damage or destroy several pursuing Jem'Hadar attack ships. The plan worked and the detonation of the plasma field knocked the enemy ships off course. (DS9: "Blaze of Glory")
A Federation troop convoy used the plasma fields of the Badlands to hide their movements from the Dominion in 2374. (DS9: "Waltz")