magnetic field disturbances

"Strong electromagnetic signals were observed from the burst, as were significant magnetic field disturbances and earth currents."

The Pioneer Venus Orbiter detected magnetic field disturbances that are correlated with 2201 Oljato.

Substorms can cause magnetic field disturbances in the auroral zones up to a magnitude of 1000 nT, roughly 2% of the total magnetic field strength in that region.

On April 20, 2007, STEREO-A observed the tail of Comet Encke to be temporarily torn off by magnetic field disturbances caused by a coronal mass ejection (a blast of solar particles from the Sun).