The statistical studies of the inner boundary of plasma sheet
The statistical studies of the inner boundary of plasma sheet
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等离子体片内边界的统计研究
DOI：
10.5194/angeo-29-289-2011
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发表时间：
2011-02
影响因子：
1.9
通讯作者：
W. Z. Ding
中科院分区：
文献类型：
--
作者：
J. B. Cao;W. Z. Ding
摘要。由于等离子体片离子是风暴期间环电流的主要粒子源之一，因此等离子体片离子在磁层内部的渗透对磁层内部动力学具有重要意义。然而，由于6.6 R E外近赤道轨道上的卫星数量有限，对等离子层内界的直接观测相当罕见。本文利用TC-1卫星2004 ~ 2006年记录的离子数据，研究了离子等离子体片（IBIPS）的内边界分布，首次得到了离子等离子体片在赤道平面上的观测分布。IBIPS具有黎明-黄昏不对称，在06:00 - 08:00 LT bin中离地球最远，在18:00-20:00 LT bin中离地球最近。此外，IBIPS还具有昼夜不对称性，这可能是由于白天侧的离子在其漂移路径上暴露于损失机制的时间更长。随着Kp指数的增加，IBIPS的径向距离普遍减小。静时IBIPS的平均径向距离基本大于6.6 R E，活跃时小于6.6 R E。当对流电场强度增大时，夜侧（22:00-02:00 LT） IBIPS向内移动最为显著。当Kp≤0 +时，只有16%的ibips穿透地球同步轨道。然而，对于2≤Kp +， 70%的ibips穿透地球同步轨道内部。IBIPS与AE和Dst指数呈弱相关。R i与Kp的平均相关系数为- 0.58，而R i与AE/Dst的相关系数仅为- 0.29/0.17。相关系数与当地时间有关。特别是在夜间扇区，R i和Kp高度相关（R = - 0.72），这意味着IBIPS在夜间扇区的径向距离R i对Kp指数有很好的响应。这些观测结果表明，Kp在决定IBIPS位置方面起着关键作用。
Abstract. The penetration of plasma sheet ions into the inner magnetosphere is very important to the inner magnetospheric dynamics since plasma sheet ions are one of the major particle sources of ring current during storm times. However, the direct observations of the inner boundary of the plasma sheet are fairly rare due to the limited number of satellites in near equatorial orbits outside 6.6 R E . In this paper, we used the ion data recorded by TC-1 from 2004 to 2006 to study the distribution of inner boundary of ion plasma sheet (IBIPS) and for the first time show the observational distribution of IBIPS in the equatorial plane. The IBIPS has a dawn-dusk asymmetry, being farthest to the Earth in the 06:00 08:00 LT bin and closest to the Earth in the 18:00–20:00 LT bin. Besides, the IBIPS has also a day-night asymmetry, which may be due to the fact that the ions on the dayside are exposed more time to loss mechanisms on their drift paths. The radial distance of IBIPS decrease generally with the increase of Kp index. The mean radial distance of IBIPS is basically larger than 6.6 R E during quiet times and smaller than 6.6 R E during active times. When the strength of convection electric field increases, the inward shift of IBIPS is most significant on the night side (22:00–02:00 LT). For Kp ≤ 0 + , only 16% of IBIPSs penetrate inside the geosynchronous orbit. For 2 ≤ Kp + , however, 70% of IBIPSs penetrate inside the geosynchronous orbit. The IBIPS has weak correlations with the AE and Dst indexes. The average correlation coefficient between R i and Kp is −0.58 while the correlation coefficient between R i and AE/Dst is only −0.29/0.17. The correlation coefficients are local time dependent. Particularly, R i and Kp are highly correlated ( r =−0.72) in the night sector, meaning that the radial distance of IBIPS R i in the night sector has the good response to the Kp index These observations indicate that Kp plays a key role in determining the position of IBIPS.
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影响因子：
5.2
作者：
A. Runov;V. Angelopoulos;N. Ganushkina;R. Nakamura;J. Mcfadden;D. Larson;I. Dandouras;K. Glassmeier;C. Carr
通讯作者：
A. Runov;V. Angelopoulos;N. Ganushkina;R. Nakamura;J. Mcfadden;D. Larson;I. Dandouras;K. Glassmeier;C. Carr
影响因子：
5.2
作者：
N. Ganushkina;T. Pulkkinen;V. Bashkirov;D. Baker;Xinlin Li
通讯作者：
N. Ganushkina;T. Pulkkinen;V. Bashkirov;D. Baker;Xinlin Li
影响因子：
--
作者：
S. Maurice;M. Thomsen;D. McComas;R. Elphic
通讯作者：
S. Maurice;M. Thomsen;D. McComas;R. Elphic
影响因子：
--
作者：
Y. Ebihara;M. Fok;S. Sazykin;M. Thomsen;M. Hairston;D. Evans;F. Rich;M. Ejiri
通讯作者：
Y. Ebihara;M. Fok;S. Sazykin;M. Thomsen;M. Hairston;D. Evans;F. Rich;M. Ejiri
DOI：
10.1029/2000ja900062
发表时间：
2000-11
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
--
作者：
N. Ganushkina;T. Pulkkinen;V. Sergeev;M. Kubyshkina;D. Baker;N. Turner;M. Grande;B. Kellett;J. Fennell;J. Roeder;J. Sauvaud;T. Fritz
通讯作者：
N. Ganushkina;T. Pulkkinen;V. Sergeev;M. Kubyshkina;D. Baker;N. Turner;M. Grande;B. Kellett;J. Fennell;J. Roeder;J. Sauvaud;T. Fritz