Plasma field

From Memory Alpha, the free Star Trek reference.

A plasma field is 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 as plasma field at the psychological conference they've just visited. He discribed this as an amazing experience and told that the plasma moved upon his arm and was very warm. (TNG: "Timescape")

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")