论文标题
评估太阳风的加热率
On the evaluation of solar wind's heating rates
论文作者
论文摘要
太阳能加热速率通常是通过将等离子体和磁场数据与一组模型功能拟合来计算的。在这封信中，我们表明，通过这种方法获得的利率很大程度上取决于人们对这些模型功能做出的相当任意的选择。一种基于局部和始终测量的血浆和磁场参数的绝热不变剂的径向演化的替代方法，没有这种缺陷。我们将此技术应用于最近发布的Helios质子数据集，并确认存在太阳风质子的明显垂直加热。另一方面，数据在数据中没有显着变化。我们得出的结论是，迄今为止，在0.3至1 au的距离范围内，已经有了对太阳风质子与平行绝热性的偏差的明确观察。
Solar wind heating rates have often been calculated by fitting plasma and magnetic field data with a set of model functions. In this letter, we show that the rates obtained by such an approach strongly depend on the rather arbitrary choice one makes for these model functions. An alternative approach, consisting in monitoring the radial evolution of the adiabatic invariants, based on locally and consistently measured plasma and magnetic field parameters, is free from such a flaw. We apply this technique to a recently released Helios proton dataset, and confirm the existence of a clear perpendicular heating of solar wind's protons. On the other hand, no significant change in the parallel adiabatic invariant is visible in the data. We conclude that to date, and in the distance range of 0.3 to 1 AU, no clear observation of a deviation of solar wind's protons from parallel adiabaticity has ever been made.
