In the near future, Parker Solar Probe and Solar Orbiter will provide the first comprehensive in-situ measurements of the solar wind in the inner heliosphere since the Helios mission in the 1970s. We describe a reprocessing of the original Helios ion distribution functions to provide reliable and reproducible data to characterise the proton core population of the solar wind in the inner heliosphere. A systematic fitting of bi-Maxwellian distribution functions was performed to the raw Helios ion distribution function data to extract the proton core number density, velocity, and temperatures parallel and perpendicular to the magnetic field. We present radial trends of these derived proton parameters, forming a benchmark to which new measurements in the inner heliosphere will be compared. The new dataset has been made openly available for other researchers to use, along with the source code used to generate it.

中文翻译：

---

来自 Helios 任务的新的内日光层质子参数数据集


在不久的将来，帕克太阳探测器和太阳轨道飞行器将提供自 20 世纪 70 年代赫利俄斯任务以来首次对日球层内太阳风进行全面的现场测量。我们描述了对原始赫利俄斯离子分布函数的重新处理，以提供可靠且可重复的数据来表征内日光层中太阳风的质子核心群体。对原始 Helios 离子分布函数数据进行双麦克斯韦分布函数的系统拟合，以提取平行和垂直于磁场的质子核心数密度、速度和温度。我们展示了这些导出的质子参数的径向趋势，形成了一个基准，将与内日光层的新测量结果进行比较。新数据集以及用于生成它的源代码已公开供其他研究人员使用。