...
  • 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 >MESSENGER observations of large dayside flux transfer events: Do they drive Mercury’s substorm cycle?
【24h】

MESSENGER observations of large dayside flux transfer events: Do they drive Mercury’s substorm cycle?

机译：信使号大的光面通量的观测转会事件:他们开车水星的亚暴循环?

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

The large-scale dynamic behavior of Mercury’s highly compressedmagnetosphere is predominantly powered by magnetic reconnection, which transfers energy and momentum from the solar wind to the magnetosphere. The contribution of flux transfer events (FTEs) at the daysidemagnetopause to the redistribution of magnetic flux in Mercury’s magnetosphere is assessed with magnetic field data acquired in orbit about Mercury by the Magnetometer on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft. FTEs with core fields greater than the planetary field just inside the magnetopause are prevalent at Mercury. Fifty-eight such large-amplitude FTEs were identified during February and May 2012, when MESSENGER sampled the subsolar magnetosheath. The orientation of each FTE was determined by minimum variance analysis, and the magnetic flux content of each was estimated using a force-free flux rope model. The average flux content of the FTEs was 0.06 MWb, and their durations imply a transient increase in the cross-polar cap potential of ~25 kV. For a substorm timescale of 2–3min, as indicated by magnetotail flux loading and unloading, the FTE repetition rate (10 s) and average flux content (assumed to be 0.03 MWb) imply that FTEs contribute at least ~30% of the flux transport required to drive the Mercury substorm cycle. At Earth, in contrast, FTEs are estimated to contribute less than 2% of the substorm flux transport. This result implies that whereas at Earth, at which steady-state dayside reconnection is prevalent, multiple X-line dayside reconnection and associated FTEs at Mercury are a dominant forcing for magnetospheric dynamics.
机译：水星的大规模动态行为高度compressedmagnetosphere主要是由磁重联,转移从太阳风的能量和动量磁气圈。在的daysidemagnetopause事件(fte)再分配的水星的磁通量评估磁气圈的磁场数据获得关于水星的轨道磁力仪在水星表面,空间环境、地球化学和范围(MESSENGER)宇宙飞船。大于行星领域内在水星磁层普遍存在。58大幅度,招聘等确定在2月和2012年5月,当信使采样的现世的磁鞘。每个FTE是由最小的方向方差分析和磁通的内容使用自由变化的估计绳模型。0.06 MWb,时间意味着瞬态增加cross-polar帽~ 25 kV的潜力。2-3min,表明磁尾通量加载卸货,FTE重复率(10)和平均通量内容(假定为0.03 MWb)暗示,招聘至少~ 30%的贡献通量传输所需驱动汞亚暴周期。据估计,不到2%的贡献亚暴通量传输。而在地球上,在稳态的光面重新连接是普遍的,多个x轴的光面重新连接和相关的招聘汞是一种占主导地位的磁性层的强迫动力学。

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