WASHINGTON: Nasa's twin Radiation Belt Storm Probe (RBSP) satellites have captured the chirping and whistling radio waves emitted by Earth’s magnetosphere, known as 'Earth's chorus'.

It can be heard by human ears but you need to take your helmet off while floating in space which is not medically advisable. You might also encounter the tricky problem of sound not travelling through the vacuum.

Craig Kletzing from the University of Iowa, the principal investigator of the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) instruments on-board the satellites, said “People have known about chorus for decades. Radio receivers are used to pick it up, and it sounds a lot like birds chirping. It was often more easily picked up in the mornings, which along with the chirping sound is why it’s sometimes referred to as "dawn chorus".”

The sounds are emitted by energetic particles in the upper levels of Earth’s magnetosphere, before they get whipped around by the radiation belts circling the Earth.

The Van Allen belts are streams of particles, which arrive in Earth's vicinity from the solar winds and get caught in Earth's magnetic field.