Plasma eddy
A plasma eddy is a destructive and energetic phenomenon that can be found in neutronic storms. Venturing too close to a plasma eddy can be extremely dangerous, and even lead to the destruction of one's ship.

In 2152, while inside a neutronic storm,  set a course for a cluster of plasma eddies in an attempt to persuade members of the Takret Militia, who had taken control of Enterprise, to leave the ship. ()

See also 
 Astral eddy
 Subspace eddy
Astronomical phenomena