The effects of dynamic ionospheric outflow on the ring current
The effects of dynamic ionospheric outflow on the ring current
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DOI：
10.1029/2010ja015642
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发表时间：
2011-02
影响因子：
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通讯作者：
D. Welling;V. Jordanova;S. Zaharia;A. Glocer;G. Tóth
中科院分区：
文献类型：
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作者：
D. Welling;V. Jordanova;S. Zaharia;A. Glocer;G. Tóth
[1]电离层O+对暴时环电流发展的重要性已得到公认，但尚未得到很好的理解。在全球MHD模型中加入这种外流有可能改变磁场结构、粒子密度和温度以及对流电场。这使得在环电流模拟中包括重离子流出变得困难，因为这种增加不能容易地与许多其他变化解耦。本研究试图克服这个问题，使用三个耦合模型，PWOM，RIM，和BATS-R-US，驱动环电流模型，RAM-SCB。当流出包括和不包括驱动程序的差异进行比较，看看流出如何改变环电流输入。据发现，包括这种外流减少对流电场，降低等离子体片数密度和温度，并增加了复杂的等离子体片离子组成的时间和空间。这些变化导致环电流能量密度的总体降低。进一步的模拟，试图隔离这些影响发现，环电流发展方面最重要的变化是对流电场的下降。本地时间依赖的O+注入被发现是不平凡的。捕捉所有这些影响需要一个完整的系统，第一原则的方法。
[1] The importance of ionospheric O+ on the development of the storm time ring current is recognized but not well understood. The addition of this outflow in global MHD models has the potential to change the magnetic field configuration, particle densities and temperatures, and the convection electric field. This makes including heavy ion outflow in ring current simulations difficult, as this addition cannot be easily decoupled from a host of other changes. This study attempts to overcome this problem by using three coupled models, PWOM, RIM, and BATS-R-US, to drive a ring current model, RAM-SCB. The differences in drivers when outflow is included and is not included are compared to see how outflow changes ring current input. It is found that including this outflow reduces the convection electric field, lowers the plasma sheet number density and temperature, and increases the complexity of the plasma sheet ion composition both temporally and spatially. These changes cause an overall reduction in ring current energy density. Further simulations that attempt to isolate these effects find that the most important change in terms of ring current development is the drop in convection electric field. Local time dependencies of O+ injections are found to be nontrivial as well. Capturing all of these effects requires a whole system, first-principles approach.