Waves

The Juno Waves instrument consists of an electric dipole antenna and a magnetic search coil and corresponding receivers. Its spectral coverage goes from 50 Hz up to 40 MHz (electric) or 20 kHz (magnetic) to measure the large variety of Jovian radio emissions.

Waves has measured electron and proton whistlers, lightning whistlers, impacting dust particles, Langmuir waves, electron cyclotron waves, auroral plasma waves, quasi-periodic radio bursts, as well as kilometric, hectometric, and decametric radio emissions. The unique trajectory of Juno should lead the spacecraft through the source region of auroral radio emissions, which is uncharted territory. Besides in-situ measurements at the sources, the rotating dipole technique can also be used to locate the source locations of radio waves.

IWF scientists have calibrated the Juno Waves antenna using grid models for numerical computer simulations (see figure) and the experimental technique of rheometry, in which a metallic scale model of the spacecraft was immersed in an electrolytic tank.