...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Rapidly moving sources of upper band ELF/VLF chorus near the magnetic equator
【24h】

Rapidly moving sources of upper band ELF/VLF chorus near the magnetic equator

机译：快速移动的上层精灵带/甚低频来源合唱团在磁赤道附近

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Multiple simultaneous wideband (Gurnett et al., 2001) measurements on the Cluster spacecraft of upper band chorus emissions near the magnetic equator (at magnetic latitudes between ?20° and 10° and L shells ranging between L = 4 and L = 5) are used to deduce the properties of the compact source regions of ELF/VLF chorus emissions. The frequency differences exhibited by the same chorus emissions observed on different spacecraft are interpreted (Inan et al., 2004) in terms of a differential Doppler shift, using a simple model involving rapidly moving sources traveling at speeds comparable to the parallel resonant velocity of counter-streaming gyroresonant electrons. Cluster observations are used to determine the location and extent along the Earth's magnetic field lines of the source of chorus. Frequency and time differences between spacecraft are interpreted as a direct consequence of the rapid motion of highly localized source regions of chorus. In this paper, we examine the previously presented model of rapid motion of sources of chorus, extending the calculations to a three-dimensional space, using measurements of the four Cluster spacecraft. These calculations of source location and velocity as a function of frequency indicate that chorus sources move a distance of ～6000 km along the field lines. The emitted chorus waves at the source are assumed to have a wide range of wave normal angles, but the rays reaching the spacecraft seem to be the ones with lower angles (with some exceptions). The ranges of velocity obtained vary with frequency around values ranging from ～0.01c to ～0.04c.
机译：多个同时宽带(Gurnett et al .,2001)集群航天器的测量上乐队合唱排放附近的磁场赤道(磁纬度之间? 20°10°和L贝壳介于L = 4 L = 5)是用来推断出紧凑的属性源地区的精灵/甚低频合唱排放。表现出同样的频率差异合唱排放观察在不同的宇宙飞船解释(阿齐兹·伊南et al ., 2004)的吗差动多普勒频移,使用一个简单的模型涉及快速移动的速度来源速度与并联谐振速度counter-streaming gyroresonant电子。确定的位置和程度地球磁场的来源合唱。宇宙飞船直接解释高度的快速运动的结果局部源地区的合唱。篇文章中,我们检查之前提出的模型快速运动的合唱,扩展计算一个三维空间,使用测量的四个集群宇宙飞船。和速度作为频率的函数合唱来源移动的距离~ 6000公里沿电场线。在假定有一个广泛的来源波正常角度,但射线到达宇宙飞船似乎较低的角度(也有例外)。获得随频率值从c ~ 0.01 ~ 0.04 c。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号