'Musical' Waves Detected in Earth's Magnetic Field

In Norway, a space weather observatory detected sine waves of exceptional purity rippling through Earth's polar magnetic field.

The waves, which persisted for hours with nearly perfect pitch, have been linked to "tearing instabilities" and explosions in Earth's magnetic tail--not to mention bright auroras in Arctic skies.

More Information - https://spaceweatherarchive.com/2018/11/24/quiet-sun-makes-musical-waves-in-earths-magnetic-field/