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首页> 外文期刊>Geomagnetism and Aeronomy >Spatial distribution of the field-aligned current density in the polar ionosphere and the contribution of magnetosound waves
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Spatial distribution of the field-aligned current density in the polar ionosphere and the contribution of magnetosound waves

机译：极性电离层中场取向电流密度的空间分布和磁声波的贡献

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摘要

The regular appearance of the chain of oppositely directed field-aligned current (FAC) pairs near the noon-midnight meridian during three considered substorms has been described. The FAC pairs (FACs flowing into the ionosphere in the morning and flowing out of this region in the evening and vice versa) are observed in each of three Iijima and Potemra zones. The FAC direction in the fixed LT sector periodically varies along the chain. The scenario, according to which each FAC pair (seven pairs) is identified with a hump or trough of one of the waves propagating from the Earth and toward the Earth in different magnetospheric domains, has been described. The estimated wave velocities differ from 100 to >1000 km/s depending on the propagation region but everywhere agree with the corresponding velocities of magnetosound waves (MSWs). The hypothesis is proposed, according to which these MSWs are excited by plasma ejection during current disruption and reconnection near the dayside magnetopause and in the near/middle regions of the nightside tail. [PUBLICATION ABSTRACT]
机译：已经描述了在三个考虑的亚暴期间中午-午夜子午线附近相反方向的场对准电流（FAC）对链的规则出现。在Iijima和Potemra的三个区域中都观察到了FAC对（FAC对（早上流入电离层，晚上流出电离层，反之亦然））。固定LT扇区中的FAC方向沿着链定期变化。已经描述了一种场景，根据该场景，每个FAC对（七对）都被识别为从地球传播到不同磁层域并向地球传播的波之一的波峰或波谷。根据传播区域的不同，估计的波速从100到> 1000 km / s不等，但到处都与磁声波（MSW）的相应速度一致。提出了一种假说，根据该假说，这些杂散声在电流中断和靠近日间磁更年期附近以及夜侧尾巴的近/中区域的电流中断和重新连接期间被等离子体喷射激发。 [出版物摘要]

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