Motions of charged particles trapped in the Earth's magnetosphere
Motions of charged particles trapped in the Earth's magnetosphere
复制标题
地球磁层中捕获的带电粒子的运动
DOI：
10.1029/jz068i005p01209
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发表时间：
1963
影响因子：
--
通讯作者：
E. W. Hones
中科院分区：
文献类型：
--
作者：
E. W. Hones
地球卫星最近的测量提供了确凿的证据，证明地球的磁层被太阳风扭曲了，正如一段时间以来在理论基础上所预测的那样。在这里报道的工作中，通过使用弱磁偶极子在强磁偶极子存在下的磁场作为磁层模型，计算了被困在扭曲磁层中的带电粒子的运动。对于运动局限于磁赤道面的粒子和在低海拔处镜像的粒子，计算了通过该场的漂移路径。计算了在磁场梯度漂移和磁场旋转共同作用下，不同能量粒子在磁赤道面上的运动路径。在所使用的模型中发现，磁场旋转使被困粒子在地球的早晨一侧带电，并使它们在地球的黄昏一侧断电。有人提出，这种效应必然出现在任何实际的扭曲磁层模型中，并且它可能在构成范艾伦带的高能粒子的积累中起作用。
Recent measurements by earth satellites provide conclusive evidence that the magnetosphere of the earth is distorted by the solar wind, as has been predicted on theoretical grounds for some time. In the work reported here motions of charged particles trapped in the distorted magnetosphere were computed by using, as a model of the magnetosphere, the field of a weak magnetic dipole in the presence of a strong magnetic dipole. Drift paths through this field were calculated both for particles whose motion is confined to the magnetic equatorial plane and for particles mirroring at low altitudes. The paths of particles of various energies moving in the magnetic equatorial plane under the combined influences of field gradient-induced drift and field rotation were also calculated. It was found that, in the model used, the field rotation energizes trapped particles on the morning side and de-energizes them on the evening side of the earth. It is suggested that this effect must occur in any realistic model of the distorted magnetosphere and that it may play a role in the accumulation of the energetic particles that constitute the Van Allen zones.