Extended pan-spectrum fitting of energetic particle spectra  

作　　者：WenYan Li LingHua Wang YongFu Wang XinNian Guo QianYi Ma 

机构地区：[1]School of Earth and Space Sciences,Peking University,Beijing 100871,China

出　　处：《Earth and Planetary Physics》2025年第2期366-374,共9页地球与行星物理(英文版)

基　　金：supported in part by NSFC under contracts 42225404, 42127803, 42150105;by National Key R&D Program of China No. 2021YFA0718600;by ISSI-BJ through the international teams Nos. 23-581 and 56。

摘　　要：The energy spectrum of energetic particles in space often shows a non-thermal spectral shape with two spectral transitions/breaks over a wide energy range, carrying crucial information about their acceleration, release and transportation process. To self-consistently characterize the spectral features of energetic particles, here we propose a novel extended pan-spectrum(EPS) formula to fit the particle energy-flux spectrum, which has the merit that can incorporate many commonly used spectrum functions with one spectral transition, including the pan-spectrum, double-power-law, Kappa, Ellison-Ramaty(ER) functions, etc. The formula can also determine the spectral shape with two spectral transitions, including the triple-power-law function, Kappa distribution(at low energy)plus power law(at high energy), power law(at low energy) plus ER function, etc. Considering the uncertainties in both J and E, we can fit this EPS formula well to the representative energy spectra of various particle phenomena in space, including solar energetic particles(electrons, protons, ~3He and heavier ions), anomalous cosmic rays, solar wind suprathermal particles(halo and superhalo electrons;pick-up ions and the suprathermal tail), etc. Therefore, the EPS fitting can help us self-consistently determine the spectral features of different particle phenomena, and improve our understanding of the physical nature of the origin, acceleration, and transportation of energetic particles in space.

关 键 词：energy spectrum fitting solar energetic particle solar wind suprathermal particle anomalous cosmic ray pick-up ion 

分 类 号：P35[天文地球—空间物理学]