An empirical plasmasphere and trough density model: CRRES observations
An empirical plasmasphere and trough density model: CRRES observations
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DOI：
10.1029/2000ja000286
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发表时间：
2001-11-01
影响因子：
2.8
通讯作者：
Anderson, RR
中科院分区：
文献类型：
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作者：
Sheeley, BW;Moldwin, MB;Anderson, RR
释放和辐射效应综合卫星（CRRES）扫频接收器数据被用来开发一个经验模型的等离子体散射和槽数密度。超过1000 CRRES轨道提供了良好的统计覆盖所有本地时间之间的L壳3至7。CRRES密度数据被分为plasmaspheric-like和trough-like通过假设一个最小的密度值的plasmaspheric-like作为L壳的函数。对于等离子体，发现作为L壳（3小于或等于L小于或等于7）的函数的平均数密度（cm（-3））为：n（p）= 1390（3/L）（4.8）+/- 440（3/L）（3.6）。对于波谷，平均数密度（cm（-3））作为L壳层的函数（3小于或等于L小于或等于7）和磁地方时（0小于或等于LT小于或等于24）发现n（t）= 124（3/L）（4.0）+36（3/L）（3.5）cos（{LT-[7.7（3/L）（2.0）+12]}pi /12）+/- {78（3/L）（4.7）+17（3/L）（3.7）cos[（LT - 22）pi /12]}。没有明确的依赖于磁活动被发现的密度模型。该经验模型是对早期模型的改进，因为它在当地时间上是连续的，并且可用于根据再填充历史跟踪密度。模型标准偏差代表谷的早期或晚期再填充或新填充或饱和等离子体层密度。
Combined Release and Radiation Effects Satellite (CRRES) sweep frequency receiver data were used to develop an empirical model of the plasmasphere and trough number density. The over 1000 CRRES orbits provided good statistical coverage of all local times between an L shell of 3 to 7. The CRRES density data were separated into plasmaspheric-like and trough-like by assuming a minimum density value for the plasmasphere as a function of L shell. For the plasmasphere the average number density (in cm(-3)) as a function of L shell (3 less than or equal to L less than or equal to 7) was found to be: n(p) = 1390 (3/L)(4.8) +/- 440 (3/L)(3.6). For the trough the average number density (in cm(-3)) as a function of L-shell (3 less than or equal to L less than or equal to 7) and magnetic local time (0 less than or equal to LT less than or equal to 24) was found to be n(t) = 124 (3/L)(4.0) + 36(3/L)(3.5) cos({LT-[7.7(3/L)(2.0)+12]}pi /12) +/- {78 (3/L)(4.7) + 17(3/L)(3.7) cos[(LT - 22)pi /12]}. No clear dependence on magnetic activity was found for either density model. This empirical model is an improvement over earlier models in that it is continuous in local time and can be used to track densities based on refilling history. The model standard deviations are representative of either early time or late time refilling of the trough or newly filled or saturated plasmaspheric densities.