Multi‐point observations of the inner boundary of the plasma sheet during geomagnetic disturbances
Multi‐point observations of the inner boundary of the plasma sheet during geomagnetic disturbances
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DOI：
10.1029/2008gl033982
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发表时间：
2008-09
影响因子：
5.2
通讯作者：
A. Runov;V. Angelopoulos;N. Ganushkina;R. Nakamura;J. Mcfadden;D. Larson;I. Dandouras;K. Glassmeier;C. Carr
中科院分区：
文献类型：
--
作者：
A. Runov;V. Angelopoulos;N. Ganushkina;R. Nakamura;J. Mcfadden;D. Larson;I. Dandouras;K. Glassmeier;C. Carr
我们报告了2007年3月23日在亚暴期间在地心距离3 < R < 8 RE的THEMIS和双星星星TC-1观测结果。THEMIS以珍珠串的形式穿过赤道黄昏侧等离子体的内边界，使粒子群的动力学在数小时到10分钟的时间范围内得以追踪。观测显示在4 < R < 6 RE时等离子体片离子群（5 - 30 keV）与环电流离子群（100 - 1000 keV）共存。等离子体片群的特征在于明显的“鼻”状色散，光谱密度最大值在10 keV。等离子体片的边界，由急剧减少的101 keV的电子通量，向内移动到R = 4和向外返回到108 RE约1小时内。在5 < R < 6 RE的亚暴区，等离子体片（1 - 5 keV）电子通量的局部增强具有2 - 10 min的特征时间尺度。
We report on the THEMIS and Double Star TC‐1 observations at the geocentric distances of 3 < R < 8 RE during substorms on March 23, 2007. THEMIS crossed the inner boundary of the equatorial dusk‐side plasma in the string‐of‐pearls configuration, allowing the dynamics of particle populations to be traced within time ranges from hours to 10 minutes. Observations show co‐existence of the plasma sheet ion population (5 – 30 keV) with the ring current ion population (100 – 1000 keV) at 4 < R < 6 RE. The plasma sheet population was characterized by pronounced “nose”‐like dispersion with the spectral density maximum at ∼10 keV. The plasma sheet boundary, defined by a sharp decrease of the ∼1 keV electron flux, moved inward to R = 4 and outward back to ∼8 RE within about 1 hour. Local enhancements of the plasma sheet (1 – 5 keV) electron flux with the characteristic time scale of 2 – 10 min were detected at 5 < R < 6 RE during the substorm.