Reflection of the solar wind ions at the Earth's bow shock: Energization
Reflection of the solar wind ions at the Earth's bow shock: Energization
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太阳风离子在地球弓激波处的反射：能量化
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
C. Russell
中科院分区：
文献类型：
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作者：
C. Bonifazi;G. Moreno;C. Russell
在统计基础上，针对简单的反射模型，测试了在地球弓形激波上游观测到的场对准质子束的能量。使用 ISEE 2 航天器收集的等离子体和磁场数据进行比较。观测涉及1977年11月5日至12月20日期间。根据该模型，一些入射到地球激波锋面的太阳风质子在向上游反射时通过平行于行星际电场的位移获得能量。反射中获得的能量可以描述为行星际磁场、太阳风整体速度和局部激波法线之间角度的函数。找到这些角度的任务，即地球冲击波前沿反射离子的预期源点，已经使用测量的磁场方向和实际的束轨迹解决了。后一种方法考虑了离子漂移速度，当远离激波时，理论与观察结果之间可以更好地吻合。特别是，它使我们能够检查场对准光束的能量，即使是在远离地球弓形激波（距离可达 10-15 RE）的地方观察到的光束。我们在统计基础上确认了最近使用洛斯阿拉莫斯国家实验室/马克斯普朗克地外观测对 ISEE 1 和 2 进行的模型测试。我们推断反射光束有时可以传播到地球弓激波上游很远的地方，而不会改变其能量特性。
The energies of the field-aligned proton beams observed upstream of the earth's bow shock are tested, on a statistical basis, against a simple reflection model. The comparison is carried out using both plasma and magnetic field data collected by the ISEE 2 spacecraft. The observations refer to the period from November 5 to December 20, 1977. According to this model, some of the solar wind protons incident upon the earth's shock front when reflected upstream gain energy by displacement parallel to the interplanetary electric field. The energy gained in the reflection can be described as a function of the angles between the interplanetary magnetic field, the solar wind bulk velocity, and the local shock normal. The task of finding these angles, i.e., the expected source point of the reflected ions at the earth's shock front, has been resolved using both the measured magnetic field direction and the actual beam trajectory. The latter method, which takes into account the ion drift velocity, leads to a better agreement between theory and observations when far from the shock. In particular, it allows us to check the energies of the field-aligned beams even when they are observed far from the earth's bow shock (at distances up to 10–15 RE). We confirm, on a statistical basis, the test of the model recently carried out using the Los Alamos National Laboratory/Max-Planck-extraterrestrische observations on ISEE 1 and 2. We infer that reflected beams can sometimes propagate far upstream of the earth's bow shock without changing their energy properties.