论文标题
慢性太阳风在0.13至0.5 au中的热和外电子种群的径向演变：帕克太阳探针观测
Radial evolution of thermal and suprathermal electron populations in the slow solar wind from 0.13 to 0.5 au : Parker Solar Probe Observations
论文作者
论文摘要
我们开发并将定制的拟合程序应用于帕克太阳能探针（PSP）在其前五个轨道上测量的大量太阳风电子分布数据，覆盖了从0.13到0.5 au的径向距离。我们表征了这些轨道中慢性太阳风中电子芯，光晕和Strahl种群的径向演变。这三个电子种群的分数密度为联合外晕和Strahl种群的生长从0.13到0.17 au提供了证据。此外，正如以前在大于0.3 au的距离上的观察结果报道的那样，在这些距离下的strahl种群的减少不匹配光环群的增长。我们还发现，在小型的以heliepentric距离上，光环可以忽略不计。分数strahl密度保持相对恒定的〜1％低于0.2 au，这表明相对光环密度的上升不仅是由于strahl电子转移到晕圈中。
We develop and apply a bespoke fitting routine to a large volume of solar wind electron distribution data measured by Parker Solar Probe (PSP) over its first five orbits, covering radial distances from 0.13 to 0.5 au. We characterise the radial evolution of the electron core, halo and strahl populations in the slow solar wind during these orbits. The fractional densities of these three electron populations provide evidence for the growth of the combined suprathermal halo and strahl populations from 0.13 to 0.17 au. Moreover, the growth in the halo population is not matched by a decrease of the strahl population at these distances, as has been reported for previous observations at distances greater than 0.3 au. We also find that the halo is negligible at small heliocentric distances. The fractional strahl density remains relatively constant ~1 % below 0.2 au, suggesting that the rise in the relative halo density is not solely due to the transfer of strahl electrons into the halo.
