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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Joint control of region-2 field-aligned currents by the east-west component of the interplanetary electric field and polar cap illumination
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Joint control of region-2 field-aligned currents by the east-west component of the interplanetary electric field and polar cap illumination

机译：通过行星际电场的东西向分量和极帽照明共同控制2区磁场对准电流

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摘要

Passes of the Polar spacecraft through the region-2 field-aligned currents at geocentric distances from 1.7 to 2.3 Earth radii in the southern hemisphere are used to measure the magnetic perturbation associated with these currents. Examination of the interplanetary electric field (IEF) measured by ACE and Wind reveals a linear dependence of the strength of the region-2 currents on the east-west component of the IEF when it is from dawn to dusk and no dependence when it is from dusk to dawn. Thus in the steady-state conditions examined herein, the region-2 currents exhibit a linear dependence on the dawn-dusk component of the IEF as do the ring-current injection and the cross-polar-cap potential drop. Examination of the state of illumination of the ionosphere at the foot of the magnetic field line through Polar reveals that the dependence of the field-aligned currents on the IEF has on average twice the slope for the sunlit ionosphere (387 nT/mV) than for the dark ionosphere (175 nT/mV). We interpret the result as consistent with the expected grater drag on the convective flow over the sunlit regions than at night due to the greater Pedersen conductivity in sunlight.
机译：极地飞船在南半球的地心距为1.7到2.3的地心距离处通过2区磁场对准的电流，用于测量与这些电流相关的磁扰动。通过ACE和Wind测量的行星际电场（IEF），揭示了当黎明到黄昏时，区域2电流强度对IEF东西向分量的线性依赖性，而当它来自黎明和黄昏时则无依赖性。黄昏到黎明。因此，在本文检查的稳态条件下，区域2电流表现出对IEF的黎明黄昏分量的线性依赖性，就像环电流注入和跨极电容电位降一样。通过Polar对磁场线脚下电离层照明状态的检查表明，场对准电流对IEF的依赖性平均是日照电离层的斜率（387 nT / mV）的两倍。黑暗电离层（175 nT / mV）。我们认为该结果与阳光照射下对流流动比预期的刨丝器阻力要晚（夜间）一致，这是由于Pedersen在阳光下的电导率更高。

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