On the possibility of nonlinear phase bunching effects in the extraordinary mode decametric radio emission of Jupiter.
Abstract
Electron phase bunching can become important on a millisecond time scale in coherent extraordinary-mode waves of the amplitude estimated for the Jovian and terrestrial radio emissions, assuming that the emission frequency is slightly above the local cyclotron frequency. Through a coherent interaction, a significant fraction of the energy of cyclotron-resonant electrons can be transferred to such waves. If the in situ wave fields are sufficiently coherent, phase-bunching effects may control the high-resolution dynamic spectrum of the emissions. Field gradients may prevent such phase bunching in the terrestrial magnetosphere, but not in the Jovian decametric source region. Phase-coherent theories suggest two possible explanations of the frequency drift of Jovian millisecond radio bursts.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1976
- DOI:
- 10.1086/154793
- Bibcode:
- 1976ApJ...209..945R
- Keywords:
-
- Decametric Waves;
- Electron Bunching;
- Jupiter (Planet);
- Planetary Radiation;
- Radio Emission;
- Coherent Electromagnetic Radiation;
- Planetary Magnetospheres;
- Trapped Particles;
- Wave Amplification;
- Lunar and Planetary Exploration