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Periodic bursts of Jovian non-Io decametric radio emission

机译：木星非Io十进制无线电发射的周期性突发

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摘要

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 ≈1.5% 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-lo 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 ～ 25 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.
机译：在2000-2011年间，卡西尼号，风号和STEREO号航天器上的无线电仪器记录了大量的Jovian十米级无线电发射（DAM）。在本文中，我们报告了在十进制频率范围内最近发现的新型木星周期性无线电脉冲的分析。这些不是DAM的Io成分的爆发，其特征是在木星的几天内发生强烈的周期性重现，其周期比行星磁层（系统Ⅲ）的旋转速率长≈1.5％。通常在4到12 MHz之间观察到这些脉冲串，并且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明显更高。立体多宇宙飞船的观测结果表明，周期性爆发的无线电源以非轴对称的空心锥形辐射，并在木星在几个行星自转期间保持活跃的情况下发生亚同变。周期性的非lo DAM爆发的发生与木星上太阳风夯压力的脉冲强烈相关。此外，周期性爆发表现出每〜25天成群发生的趋势。极化测量结果表明，周期性猝发是与木星北半球相关的右旋极化无线电发射。我们建议周期性的非Io DAM爆发可能与太阳风触发的Io等离子体环面的互换不稳定性有关。

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