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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The Interplay Between Ambipolar Electric Field and Coulomb Collisions in the Solar Wind Acceleration Region
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The Interplay Between Ambipolar Electric Field and Coulomb Collisions in the Solar Wind Acceleration Region

机译：双极性电场和之间的相互作用太阳风的库仑碰撞加速度地区

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摘要

The solar wind protons are accelerated to supersonic velocities within the distance of 10 solar radii from the Sun, as a consequence of a complex physical mechanism including particle kinetic effects as well as the field-particle energy and momentum exchange. We use a numerical kinetic model of the solar wind, accounting for Coulomb collisions (BiCoP), and model a solar wind accelerated only by the ambipolar electrostatic filed (E) arising due to the difference in mass between electron and proton, and assuring quasi-neutrality and zero current. We study the effect E, which was found to be on the order of Dreicer electric field (E_D) (Dreicer, 1959), has on the resulting electron velocity distribution functions. The strahl electron radial evolution is represented by means of its pitch-angle width (PAW), and the strahl parallel temperature (T_(s,‖)). A continuous transition between collisional and weakly collisional regime results in broader PAW, compared to the single-exobase prediction imposed by the exospheric models. Collisions were found to scatter strahl electrons below 250 eV, which in turn has an effect on the measured T_(s,‖). A slight increase was found in T_(s,‖) with radial distance, and was stronger for the more collisional run. We estimate that the coronal electron temperature inferred from the observations of T_(s,‖) in the solar wind, would be overestimated for between 8% and 15%.
机译：太阳风质子加速超声波的距离内速度10太阳能来自太阳的半径,因此复杂的物理机制包括粒子以及场粒子的动力学影响能量和动量交换。动力学模型的太阳风,占库仑碰撞(BiCoP),太阳能和模型风加速仅由双极性静电产生由于(E)电子和质子之间的质量差异,和保证准中立和零电流。我们研究影响E,它被发现的顺序Dreicer电场(E_D)(Dreicer, 1959),对生成的电子速度分布函数。电子径向进化为代表的意思螺旋角的宽度(爪子),和特拉平行的温度(T_(年代,为)识别)。碰撞之间的过渡和弱碰撞机制导致更广泛的爪子,相比single-exobase预测外逸层的模型。strahl散射电子低于250 eV,进而影响测量T_(年代,为)识别。轻微的增加被发现与径向T_(年代,为)识别距离,是越强碰撞运行。电子温度的推断观察T_(年代,为)识别的太阳风,被高估了8%至15%。

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