Neptune: NASA - Voyager Space Sounds

Voyager II swept past the Neptune system on August 24-25, 1989. Neptune's atmosphere proved surprisingly active, with wind velocities clocked at over 700 MPH. This dynamic climactic activity is powered by Neptune's internal heat, which provides over twice as much energy as the feeble sunlight that the planet receives. Neptune has eight moons and three rings, as well as a highly tilted and offset magnetic field. Neptune's electromagnetic environment is surprising. It is inclined to the planetary axis by 47°. Periodic pulses of radio energy were also recorded, generated by rotation of the planet's deep interior. Neptune's lovely blue color is a result of methane, helium and hydrogen gasses in its atmosphere. The picture of Neptune on the cover of this CD features the great dark spot, which is accompanied by white clouds that undergo rapid changes in appearance. To the south of the great dark spot is the bright feature that scientist's nicknamed "scooter". Still further to the south is the feature called "Dark Spot 2", which has a bright core. For more information about plasma and magnetic fields and their relationship to our sound recordings from space, consult the April 1991 issue of Scientific American Magazine - article entitled "Collisionless Shock Waves". Special thanks to our friends and contacts at various U.S National Space Agencies and Universities. This Space Recording Series is dedicated to the memory of Fred Scarf, PhD, who developed the acoustic recording project for Voyager and is directly responsible for the sounds you hear on these recordings from space.