Electrodynamic turbulence is an atmospheric phenomenon caused by solar flares. A thermal inversion gradient is created in the ionosphere, resulting in strong, unpredictable currents. This turbulence poses a hazard to shuttlecraft, and interferes with sensors and transporters. Ships can be protected from electrodynamic turbulence by a dielectric field.
In 2372, heavy solar flare activity caused electrodynamic turbulence throughout the Drayan star system, including on their crysata moon. This turbulence caused the crash of a Drayan shuttle and a shuttle carrying Lieutenant Tuvok and Ensign Bennet, and impeded USS Voyager's efforts to rescue them. (VOY: "Innocence")