Whistler mode chorus enhancements inassociation with energetic electron signatures in the Jovian magnetosphere
Whistler mode chorus enhancements inassociation with energetic electron signatures in the Jovian magnetosphere
复制标题
惠斯勒模式合唱增强与木星磁层中高能电子特征的关联
DOI：
10.1029/2010ja016183
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
and N. Krupp
中科院分区：
文献类型：
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作者：
Katoh;Y.;F. Tsuchiya;Y. Miyoshi;A.Morioka;H. Misawa;R. Ujiie;W. S. Kurth;A. T. Tomas;and N. Krupp
通过对伽利略号宇宙飞船的波和粒子观测进行统计调查，我们揭示了木星内磁层中哨声模式合唱的增强与高能电子各向异性的发展之间的密切关系。通过分析1995年12月至2003年9月整个伽利略任务在木星内磁层获得的5.6 Hz至20 kHz频率范围内的等离子体波数据，研究了木星磁层中强烈合唱发射的空间分布，并确定了104个合唱增强。在磁赤道附近，在6 ~ 13 RJ的径向距离范围内，观测到综合波能超过10−9V2/m2的合唱发射增强。对29-42 keV能量范围内高能粒子数据的调查表明，所有确定的合唱事件都发生在高能电子的煎饼俯仰角分布区域。利用经验等离子体和磁场模型，估计该区域的电子等离子体频率与电子回旋加速器频率之比在1 ~ 10之间。这个范围适用于有效的哨声模式波的产生。本研究显示了木星磁层中具有统计意义的煎饼俯仰角分布的高能电子的强烈合唱和通量增强之间的对应关系的完整调查。
By conducting a statistical survey of both wave and particle observations of the Galileo spacecraft, we reveal a close relationship between enhancements of whistler mode chorus and development of energetic electron anisotropies in the Jovian inner magnetosphere. We studied the spatial distribution of intense chorus emissions in the Jovian magnetosphere and identified 104 chorus enhancements by analyzing plasma wave data in the frequency range from 5.6 Hz to 20 kHz obtained from the entire Galileo mission in the inner Jovian magnetosphere during the time period from December 1995 to September 2003. Enhanced chorus emissions with integrated wave power over 10−9V2/m2were observed around the magnetic equator in the radial distance range from 6 to 13 RJ. A survey of energetic particle data in the energy range of 29–42 keV reveals that all of the identified chorus events were observed in the region of pancake pitch angle distributions of energetic electrons. The ratio of the electron plasma frequency to the electron cyclotron frequency in this region is estimated to be in the range from 1 to 10 using empirical plasma and magnetic field models. This range is suitable for efficient whistler mode wave generation. The present study shows the complete survey of the correspondence between intense chorus and flux enhancement of energetic electrons having statistically significant pancake pitch angle distributions in the Jovian magnetosphere.