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首页> 外文期刊>Geophysical Research Letters >Sudden compression of the outer magnetosphere associated with an ionospheric mass ejection
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Sudden compression of the outer magnetosphere associated with an ionospheric mass ejection

机译：与电离层质量喷射有关的外磁层突然压缩

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摘要

On September 24, 1998 at 2345 UT the magnetosphere was suddenly compressed as the dynamic pressure of the solar wind rapidly rose from 2 to 15 nPa. At the Polar spacecraft, at high altitudes above the center of the northern polar cap, a remarkably smooth increase in the field strength occurred while the plasma properties changed abruptly, as described in an accompanying paper. Comparisons with models and an examination of the wave amplitudes during the compression indicate that the initial change in plasma properties was most probably due to convection of pre-existing boundary layer plasma to the location of Polar rather than due to local heating by betatron acceleration and ion cyclotron waves. The smoothness of the increase in field strength is attributed to the very high velocity of compressional waves in the tail that outrun the advancing solar wind disturbance. The signatures as measured by GOES 10 at 1444 LT and at GOES 8 at 1846 LT in low latitude geosynchronous orbit are the more familiar sudden jump on the dayside, where the density is high and the compressional wave velocity low, and a weak change on the nightside, where tail current changes oppose the effects of the dayside magnetopause currents. This event is an ideal candidate for collaborative investigation of the effects of a classical sudden storm commencement on the magnetosphere.
机译：1998年9月24日，在2345 UT，随着太阳风的动态压力从2 nPa迅速上升到15 nPa，磁层被突然压缩。在极地飞船上，在北极极顶中心上方的高海拔处，场强显着平稳增加，而等离子体性质突然改变，如随附论文所述。与模型的比较以及压缩过程中波幅的检查表明，等离子体特性的初始变化最可能是由于预先存在的边界层等离子体对流到了Polar的位置，而不是由于电子感应加速器和离子的局部加热回旋波。场强增加的平滑性归因于尾部压缩波的极高速度，它超过了前进的太阳风扰动。在低纬度地球同步轨道上，GOES 10在1444 LT和GOES 8在1846 LT所测量的特征是在白天更为常见的突然跳跃，其密度高而压缩波速低，而在该位置上的变化很小。在夜间，尾电流的变化与白天的磁更年期电流的影响相反。该事件是合作研究经典突波暴发对磁层影响的理想人选。

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