We present a method for estimating incident photoelectrons' energy spectra as a function of altitude by combining global scale far-ultraviolet (FUV) and radio-occultation (RO) measurements. This characterization provides timely insights important for accurate interpretation of ionospheric parameters inferred from the recently launched Ionospheric Connection Explorer (ICON) observations. Quantification of photoelectron impact is enabled by the fact that conjugate photoelectrons (CPEs) directly affect FUV airglow emissions but not RO measurements. We demonstrate a technique for estimation of photoelectron fluxes and their spectra by combining coincident ICON and COSMIC2 measurements and show that a significant fraction of ICON-FUV measurements is affected by CPEs during the winter solstice. A comparison of estimated photoelectron fluxes with measured photoelectron spectra is used to gain further insights into the estimation method and reveals consistent values within 10–60 eV.

中文翻译：

---

从一致的 FUV 和无线电测量得出的共轭光电子能谱

我们提出了一种通过结合全球尺度远紫外线 (FUV) 和无线电掩星 (RO) 测量来估计作为高度函数的入射光电子能谱的方法。这种表征提供了及时的见解，对于准确解释从最近启动的电离层连接探索器 (ICON) 观测中推断出的电离层参数非常重要。由于共轭光电子 (CPE) 直接影响 FUV 气辉发射而不是 RO 测量，因此可以量化光电子影响。我们展示了一种通过结合重合的 ICON 和 COSMIC2 测量来估计光电子通量及其光谱的技术，并表明在冬至期间 ICON-FUV 测量的很大一部分受到 CPE 的影响。