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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Thermal coupling of protons and neutral hydrogen with anisotropic temperatures in the fast solar wind
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Thermal coupling of protons and neutral hydrogen with anisotropic temperatures in the fast solar wind

机译：快速太阳风中质子和中性氢与各向异性温度的热耦合

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The thermal coupling between the neutral hydrogen and protons in the inner corona is explored by extending the study of Alien ct al. [1998] to include anisotropic proton temperature to determine what the neutral hydrogen Ly alpha spectral line measurements reveal about the proton temperature, temperature anisotropy, and outflow Velocity in the fast solar wind. The anisotropic proton temperature is produced by ion cyclotron resonant interaction of protons with high-frequency waves, produced by a nonlinear cascade at the Kolmogorov dissipation rate from dominant lower-frequency Alfven waves. As a result of the coupling between the respective parallel and perpendicular components of the neutral hydrogen and proton temperatures, a greater temperature anisotropy in the neutral hydrogen develops as compared to the case when the proton temperature is isotropic. The neutral hydrogen and proton effective temperatures (T-e (f) (f) ), incorporating: both random and wave motions of the particles, and outflow velocities: are comparable below similar to 3 R-s. Neutral hydrogen and anisotropy ratios, T-H (e f f )/T-parallel to, similar to 4 below 3 R-s are readily attained, in agreement with observations. Below similar to 3 R-s, these reflect the proton anisotropy ratio. For plasma conditions typical of the fast solar wind, these results imply that the measured Ly alpha spectral line profiles, from which the neutral hydrogen temperature, anisotropy ratio, and outflow velocity are inferred, are equivalent to measurements of protons below similar to 3 R-s. Beyond this distance the width of the measured Ly alpha spectral lines provides a lower limit to the proton effective temperature and temperature anisotropy in the inner corona. [References: 57]
机译：通过扩展Alien等人的研究，探索了内部电晕中中性氢与质子之间的热耦合。 [1998]将各向异性质子温度包括在内，以确定中性氢Lyα谱线测量结果揭示了快速太阳风中质子温度，温度各向异性和流出速度。质子温度的各向异性是由质子与高频波的离子回旋共振产生的，这是由非线性级联以主要低频Alfven波在Kolmogorov耗散率下产生的。由于中性氢和质子温度的相应平行和垂直分量之间的耦合，与质子温度是各向同性的情况相比，中性氢中产生了更大的温度各向异性。中性氢和质子有效温度（T-e（f）（f））包括：粒子的随机运动和波动运动，以及流出速度：在下面与3 R-s类似。与观察结果一致，很容易获得中性氢和各向异性比率，T-H（e f f）/ T-平行，类似于3 R-s以下的4。低于3 R-s，这些反映了质子各向异性比。对于典型的快速太阳风的等离子体条件，这些结果意味着从中推断出的中性氢温度，各向异性比率和流出速度的测得的Ly alpha谱线轮廓等效于低于3 R-s的质子的测量值。超过此距离，测得的Lyα谱线的宽度为质子有效温度和内部电晕中的温度各向异性提供了下限。 [参考：57]

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