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Persistent Observations and Characteristics of Jovian Anomalous Continuum Radiation Post-Cassini Jupiter Flyby

This study analyzes the consistent detection of Jovian Anomalous Continuum (JAC) by Cassini RPWS after the Jupiter flyby for over two years. It reveals a 1/r dependence in wave power versus radial distance, suggesting a linear source. The JAC exhibits clock-like modulation at Jupiter's System III period and is theorized to propagate through a leaky waveguide mechanism in Jupiter's magnetotail. The polarized characteristics of JAC support this model, with frequency changes linked to solar wind plasma density variations. This research sheds light on using JAC as a remote diagnostic tool for monitoring solar wind conditions at Jupiter.

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Persistent Observations and Characteristics of Jovian Anomalous Continuum Radiation Post-Cassini Jupiter Flyby

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  1. Sheng-Yi Ye1, D. A. Gurnett1, J. D. Menietti1, W. S. Kurth1, G. Fischer2 1The University of Iowa 2Austrian Academy of Sciences Jovian Anomalous Continuum Radiation

  2. Cassini RPWS DAM HOM nKOM JAC

  3. Persistent observation of JAC by Cassini after Jupiter flyby Jupiter flyby

  4. Cassini trajectory in Jupiter Solar ecliptic frame 2004 2001

  5. Detection of JAC before SOI

  6. JAC wave power falls off as a function of 1/r

  7. Modulation of Jovian Anomalous Continuum

  8. Jupiter flyby Jupiter flyby Comparison with bKOM and HOM JAC • The modulation power of JAC is much higher than the other radio emissions. • The duration JAC is observed (2+ years) is much longer than that of bKOM and HOM (several months). • JAC is mostly observed after Jupiter flyby, whereas bKOM and HOM are observed both before and after the flyby. bKOM HOM

  9. Simultaneous observations of Jovian Anomalous Continuum Kaiser et al. [2004]. Cassini was at 18.6 LT, 5.6 AU from Jupiter. Ulysses was at 8.8 LT, 2.4 AU from Jupiter.

  10. Simultaneous observations by Cassini and Galileo Solar wind Solar wind Hospodarsky et al. [2004].

  11. Solar wind Magnetosphere Hospodarsky et al. [2004].

  12. Total apparent polarization degree = 0. JAC is unpolarized

  13. QP bursts are highly circularly polarized. Opposite to the circular polarization sense of DAM.

  14. Magnetosheath waveguide for JAC

  15. Frequency change of JAC reflects change of fpSW at Jupiter

  16. Conclusions • Jovian anomalous continuum near 10 kHz was consistently detected by Cassini RPWS after the Jupiter flyby for more than two years. • Wave power versus radial distance analyses revealed a 1/r dependence which is consistent with a linear source rather than a point source. • The rotational modulation analyses show that Jovian anomalous continuum is modulated like a clock at the system III period of Jupiter. • A leaky wave guide mechanism is proposed, where QP bursts wave energy is channeled down the magnetotail of Jupiter and reradiated by the magnetosheath. • The polarization characteristics of Jovian anomalous continuum are consistent with the leaky wave guide model, where the magnetosheath depolarizes the L-O mode waves through multiple reflections. • The frequency of the Jovian anomalous continuum is controlled by solar wind plasma density. So the observation of the Jovian anomalous continuum can be used as a remote diagnosis of the solar wind condition at Jupiter.

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