| Description: | Magnetized planets of the solar system are powerful auroral radiosources observed between a few kHz and 40 MHz. Over the past decades, they have been widely investigated in situ by exploration probes and remotely by ground-based radiotelescopes (for Jupiter only). These radio waves are driven by a resonant cyclotron instability in magnetized/depleted plasma regions fed in by energetic electrons. These radio waves, which can be tracked remotely over long intervals, thus provide a rich proxy of planetary magnetospheres, probing acceleration/dissipation processes and magnetospheric dynamics (induced by the solar wind, the planetary rotation, planet/satellite interactions etc.). In this seminar, I will review our current knowledge of auroral planetary radio emissions of the solar system with lessons learnt from ground-based observations (such as those of the Nançay Decameter Array) and polar in situ exploration of radiosources by space probes (by Viking/FAST, Cassini or Juno). Comparative planetology is essential to assess universal and specific properties of those radio sources, in the frame of the ongoing search of exoplanets and more massive objects by ground-based radiotelescopes such as LOFAR, NenuFAR, NRT and soon SKA. The figure shows some of Jupiter’s auroral radio sources. |
