evidence: Eerie sounds triggered by plasma waves hitting Earth's magnetic field captured in new NASA sound clip [...] NASA has released an eerie new sound clip full of high frequency "whistles, crunches, and whooshes" created when waves of plasma slam into our planet's magnetic field lines and make them "vibrate like the plucked strings of a harp," the space agency said. [...] This is not the first time that scientists have recorded sounds coming from the magnetosphere.