...
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Van Allen Probes, THEMIS, GOES, and Cluster observations of EMIC waves, ULF pulsations, and an electron flux dropout
【24h】

Van Allen Probes, THEMIS, GOES, and Cluster observations of EMIC waves, ULF pulsations, and an electron flux dropout

机译:范艾伦辐射探测器,忒弥斯,和集群位的波的观测、ULF脉动和一个电子通量辍学

获取原文
获取原文并翻译 | 示例
           

摘要

We examined an electron flux dropout during the 12–14 November 2012 geomagnetic storm using observations from seven spacecraft: the two Van Allen Probes, Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A (P5), Cluster 2, and Geostationary Operational Environmental Satellites (GOES) 13, 14, and 15. The electron fluxes for energies greater than 2.0 MeV observed by GOES 13, 14, and 15 at geosynchronous orbit and by the Van Allen Probes remained at or near instrumental background levels for more than 24 h from 12 to 14 November. For energies of 0.8 MeV, the GOES satellites observed two shorter intervals of reduced electron fluxes. The first interval of reduced 0.8 MeV electron fluxes on 12–13 November was associated with an interplanetary shock and a sudden impulse. Cluster, THEMIS, and GOES observed intense He~+ electromagnetic ion cyclotron (EMIC) waves from just inside geosynchronous orbit out to the magnetopause across the dayside to the dusk flank. The second interval of reduced 0.8 MeV electron fluxes on 13–14 November was associated with a solar sector boundary crossing and development of a geomagnetic storm with Dst<-100 nT. At the start of the recovery phase, both the 0.8 and 2.0 MeV electron fluxes finally returned to near prestorm values, possibly in response to strong ultralow frequency (ULF) waves observed by the Van Allen Probes near dawn. A combination of adiabatic effects, losses to the magnetopause, scattering by EMIC waves, and acceleration by ULF waves can explain the observed electron behavior.
机译:我们检查了一个电子通量期间辍学2012年11月12 - 14日地磁风暴从七个宇宙飞船观察:两车艾伦探针、时间事件和历史宏观尺度的相互作用,在亚暴(裁判)——(P5)集群2,和同步运行环境卫星(GOES) 13日,14和15。大于2.0兆电子伏都观察到13、14,和15在地球同步轨道和范-艾伦探针保持在或接近仪器背景水平超过从12到24小时11月14日。卫星观测到的两个短的时间间隔减少电子通量。11月12 - 13日减少0.8兆电子伏电子通量与行星际激波和有关吗突然的冲动。观察强烈他~ +电磁离子回旋加速器(位的)波从里面地球同步轨道磁层在黄昏侧面的光面。间隔0.8兆电子伏电子通量减少11月13 - 14日与太阳能有关部门边界交叉和发展的磁暴和Dst < -100元。复苏的阶段,0.8和2.0兆电子伏电子通量终于回到prestorm附近值,可能在应对强大的超低频率(ULF)波观察范-艾伦探测器接近黎明。影响,损失磁散射位的海浪,和加速度ULF波解释观察到的电子的行为。

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