...
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Geospace Plume and Its Impact on Dayside Magnetopause R_(eco)nnection Rate
【24h】

Geospace Plume and Its Impact on Dayside Magnetopause R_(eco)nnection Rate

机译:地球空间的光面羽流及其影响磁层R_ (eco) nnection率

获取原文
获取原文并翻译 | 示例
           

摘要

The role a geospace plume in influencing the efficiency of magnetopause reconnection is an open question with two contrasting theories being debated. A local-control theory suggests that a plume decreases both local and global reconnection rates, whereas a global-control theory argues that the global reconnection rate is controlled by the solar wind rather than local physics. Observationally, limited numbers of point measurements from spacecraft cannot reveal whether a local change affects the global reconnection. A distributed observatory is hence needed to assess the validity of the two theories. We use THEMIS and Los Alamos National Laboratory spacecraft to identify the occurrence of a geospace plume and its contact with the magnetopause. Global evolution and morphology of the plume is traced using GPS measurements. SuperDARN is then used to monitor the distribution and the strength of dayside reconnection. Two storm-time geospace plume events are examined and show that as the plume contacts the magnetopause, the efficiency of reconnection decreases at the contact longitude. The amount of local decrease is 81% and 68% for the two events, and both values are consistent with the mass loading effect of the plume if the plume's atomic mass is ~4 amu. R_(eco)nnection in the surrounding is enhanced, and when the solar wind driving is stable, little variation is seen in the cross polar cap potential. This study illuminates a pathway to resolve the role of cold dense plasma on solar wind-magnetosphere coupling, and the observations suggest that plumes redistribute magnetopause reconnection activity without changing the global strength substantially.
机译:地球空间柱作用的影响磁重联是一个效率悬而未决的问题有两个截然不同的理论讨论。羽减少本地和全球重联率,而全球控制理论认为,全球重联率是由太阳风而不是本地的吗物理。从飞船不能透露点测量当地的变化是否会影响全球重新连接。需要评估的有效性理论。实验室飞船来识别发生地球空间的羽流及其接触磁层。那是使用GPS跟踪测量。然后使用SuperDARN监控分布和的光面的力量重新连接。事件检测和显示,羽接触磁层的效率重新连接减少接触经度。当地的减少量为81%和68%这两个事件,两个值是一致的羽流的质量负载效应,如果羽流的相对原子质量是~ 4阿姆河。周围的增强,当太阳风驾驶是稳定的,小的变化在十字架的极冠潜力。照亮一个途径来解决冷的作用在太阳能wind-magnetosphere稠密等离子体耦合,观察表明,羽流分配的磁重联活动不改变全球力量很多。

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