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Explanation of dominant oblique radio emission at Jupiter and comparison to the terrestrial case

机译：对木星主要斜向无线电发射的解释以及与地球情况的比较

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The Io-Jupiter S-bursts are series of quasi-periodic impulsive decameter radio emissions from the magnetic flux tube connecting Jupiter to its closest galilean satellite lo. This paper discusses the possibility, suggested by previous works by Hess et al., that the S-bursts are triggered by upgoing electrons accelerated (downward) by trapped Alfven waves, that have mirrored above the Jupiter ionosphere. According to this theory, the S-bursts would correspond to wave modes that propagate at oblique angles with respect to the magnetic field. Oblique propagation is also inferred for the more slowly varying components of Io-Jupiter radio emissions. Previous works, mainly based on observations of the terrestrial AKR, whose generation process is closely related to those of S-bursts, showed that these waves are emitted on perpendicular wave modes. This discrepancy between the Jovian and Terrestrial cases has led to a controversy about the credibility of the S-bursts model by Hess et al. In the present paper, we show that indeed, the most unstable wave modes for Earth AKR, and Io-Jupiter S-bursts, as they are seen from ground based radio-telescopes, are not the same. Several causes are evaluated: observational bias, the different degree of plasma magnetization above Earth and Jupiter, the role of a cold plasma component and of plasma auroral cavities. Furthermore, we make predictions about what kind of radiation modes a probe crossing the low altitude Io-Jupiter flux tube will see.
机译：Io-Jupiter S爆发是一系列准周期脉冲式十亿无线电发射，这些辐射来自将木星与其最接近的伽利略卫星lo连接的磁通量管。本文讨论了由Hess等人先前的工作提出的可能性，即S爆发是由被捕获的Alfven波（镜像到木星电离层上方）加速（向下）加速的上行电子触发的。根据该理论，S爆发将对应于以相对于磁场倾斜的角度传播的波模式。还可以推断出Io-Jupiter无线电发射的变化较慢的分量的斜向传播。先前的工作主要基于对地面AKR的观测，该观测过程的产生过程与S爆发的发生过程密切相关，结果表明这些波是以垂直波模式发射的。 Jovian和陆地案例之间的这种差异导致了Hess等人关于S-bursts模型的可信度的争议。在本文中，我们确实表明，从地面无线电望远镜看到的地球AKR和Io-Jupiter S爆发的最不稳定波模式是不同的。评估了以下几种原因：观测偏差，地球和木星上等离子磁化的程度不同，冷等离子成分的作用和等离子极光腔的作用。此外，我们对穿过低空Io-Jupiter通量管的探头将看到的辐射模式做出了预测。

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