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首页> 外文期刊>Geophysical Research Letters >A simple model of complex cusp ion dispersions during intervals of northward interplanetary magnetic field
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A simple model of complex cusp ion dispersions during intervals of northward interplanetary magnetic field

机译：北向行星际磁场期间复杂尖端离子弥散的简单模型

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During northward IMF intervals, cusp ion energy-latitude dispersions observed by POLAR's TIMAS instrument often have two components. One dispersion decreases in energy with decreasing latitude. The second appears to split from the first and increases in energy as the equatorward edge of the cusp is approached. We present a simple model representing particle entry resulting from reconnection poleward of the cusp. We qualitatively show that split dispersions may arise on reconnected field lines which accelerate as they contract sunward into regions of lower magnetosheath flow velocity. The velocity filter effect produces the first dispersion by spreading particles entering near the reconnection site across a range of latitudes. The second, increasing energy dispersion, results from particles crossing the magnetopause at later times and lower latitudes. These particles are accelerated to higher energies due to the increased contraction speed of reconnected field lines at these latitudes. [References: 16]
机译：在向北的IMF间隔内，由POLAR的TIMAS仪器观测到的尖峰能量-纬度色散通常包含两个成分。一种色散的能量随纬度的减小而减小。第二个似乎与第一个分开，并且随着接近尖端的赤道边缘，能量增加。我们提出了一个简单的模型，表示由于尖头重新连接极点而导致的粒子进入。我们定性地表明，分裂的弥散可能会出现在重新连接的磁力线上，当它们向阳收缩进入较低磁石速流动区域时会加速。速度滤镜效果通过将进入重新连接点附近的粒子散布在一定纬度范围内而产生第一分散。第二，能量散布增加，是由于粒子在较晚的时间和较低的纬度上越过了磁层顶。由于这些纬度处重新连接的场线的收缩速度增加，这些粒子被加速到更高的能量。 [参考：16]

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