During the years 2000-2011 the radio instruments onboard Cassini, Wind and STEREO spacecraft have recorded a large amount of the Jovian decametric radio emission (DAM). In this paper we report on the analysis of the new type of Jovian periodic radio bursts recently revealed in the decametric frequency range. These bursts, which are non-Io component of DAM, are characterized by a strong periodic reoccurrence over several Jovian days with a period [Formula: see text] longer than the rotation rate of the planet's magnetosphere (System III). The bursts are typically observed between 4 and 12 MHz and their occurrence probability has been found to be significantly higher in the sector of Jovian Central Meridian Longitude between 300° and 60° (via 360°). The stereoscopic multispacecraft observations have shown that the radio sources of the periodic bursts radiate in a non-axisymmetric hollow cone-like pattern and sub-corotate with Jupiter remaining active during several planet's rotations. The occurrence of the periodic non-Io DAM bursts is strongly correlated with pulses of the solar wind ram pressure at Jupiter. Moreover the periodic bursts exhibit a tendency to occur in groups every [Formula: see text] days. The polarization measurements have shown that the periodic bursts are right hand polarized radio emission associated with the Northern magnetic hemisphere of Jupiter. We suggest that periodic non-Io DAM bursts may be connected with the interchange instability in Io plasma torus triggered by the solar wind.

中文翻译：

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木星非 Io 十度射电发射的周期性爆发

在 2000-2011 年期间，卡西尼号、Wind 和 STEREO 航天器上的无线电仪器记录了大量的木星十角无线电发射 (DAM)。在本文中，我们报告了对最近在十米频率范围内揭示的新型木星周期性射电暴的分析。这些爆发是 DAM 的非 Io 成分，其特征是在木星的几天内强烈周期性地重复发生，其周期 [公式：见文字] 比行星磁层（系统 III）的旋转速度长。这些爆发通常在 4 到 12 MHz 之间观察到，并且已经发现它们的发生概率在 300° 到 60°（通过 360°）之间的木星中央子午线经度扇区中显着更高。立体多航天器观测表明，周期性爆发的射电源以非轴对称的空心锥形模式辐射，并与木星在几个行星的自转期间保持活动状态同转。周期性非 Io DAM 爆发的发生与木星太阳风撞击压力的脉冲密切相关。此外，周期性爆发表现出每隔 [公式：见正文] 天成群出现的趋势。极化测量表明，周期性爆发是与木星北磁半球相关的右手极化无线电发射。我们认为周期性的非 Io DAM 爆发可能与太阳风引发的 Io 等离子体环面的互换不稳定性有关。