Link Of The Month voyager spacecraft recordings
“At almost 70 times farther from the Sun than the Earth, Voyager 1 is at the very edge of the Solar System. The Sun there is only 1/5,000th as bright as here on Earth — so it is extremely cold and there is very little solar energy to keep the spacecraft warm or to provide electrical power. The reason we can continue to operate at such great distances from the Sun is because we have radioisotope thermal electric generators (RTGs) on the spacecraft that create electricity and keep the spacecraft operating,” Stone said. “The fact that the spacecraft is still returning data is a remarkable technical achievement.”
The spacecraft are now so far from home that it takes nine hours and 36 minutes for a radio signal traveling at the speed of light to reach Earth,”said Ed B. Massey, project manager for the Voyager Interstellar Mission. “That signal, produced by a 20 watt radio transmitter, is so faint that the amount of power reaching our antennas is 20 billion times smaller than the power of a digital watch battery,”
Heliospheric 2-3 kHz radio emissions are produced when an interplanetary shock interacts with the heliopause, which is the boundary between the solar wind and the interstellar plasma. When the shock crosses the heliopause into the cooler, more dense interstellar medium it generates radio emissions at the electron plasma frequency, fp, and its harmonic, 2fp.