The Juno mission is providing stunning new information about Jupiter and its environment. A new magnetic field model (JRM09) with much improved accuracy near the planet provides the basis for a better understanding of Io‐related decametric radio emissions (DAM) and implications for auroral processes. Here, we selected Io‐related DAM events observed by the Juno Waves instrument to shed light into the beaming angle, the resonant electron energy, and radio source location by forward modeling. We use the JRM09 model to better constrain the location and observability of DAM and characterize the loss cone‐driven electron cyclotron maser instability. We obtained good agreement between synthetic and observed arcs with calculated beaming angles ranging from 33° to 85° and resonant electron energies up to 23 times higher than previously proposed. In addition, through a quantitative analysis, we provide an explanation regarding the higher likelihood of observing groups of arcs of Io DAM originating in the northern hemisphere relative to those originating in the southern hemisphere. This is primarily a consequence of the asymmetry of the magnetic field geometry, observer location, and pitch angles of the electrons at the equator.

中文翻译：

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Juno揭示了与离子有关的Decameter无线电发射的新见解

朱诺任务正在提供有关木星及其环境的惊人新信息。一种新的磁场模型（JRM09），其行星附近的精度大大提高，为更好地了解与Io相关的十进制无线电发射（DAM）及其对极光过程的影响提供了基础。在这里，我们选择了通过Juno Waves仪器观测到的与Io相关的DAM事件，以通过正向建模将光线照射到波束角，共振电子能量和无线电源位置。我们使用JRM09模型来更好地约束DAM的位置和可观测性，并描述损耗锥驱动的电子回旋加速器maser的不稳定性。我们获得了合成电弧和观察到的电弧之间的良好一致性，计算出的射束角范围为33°至85°，共振电子能量比以前提出的高23倍。另外，通过定量分析，我们提供了一个关于观察起源于北半球的Io DAM弧组相对于起源于南半球的弧组可能性更高的解释。这主要是磁场几何形状，观察者位置以及赤道电子的俯仰角不对称的结果。