HelMod in the Works: From Direct Observations to the Local Interstellar Spectrum of Cosmic-Ray Electrons
HelMod in the Works: From Direct Observations to the Local Interstellar Spectrum of Cosmic-Ray Electrons
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HelMod 正在进行中：从直接观测到宇宙射线电子的局域星际光谱
DOI：
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发表时间：
2018
影响因子：
4.9
通讯作者：
M. Tacconi
中科院分区：
文献类型：
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作者：
M. Boschini;S. D. Torre;M. Gervasi;D. Grandi;G. Jóhannesson;G. La Vacca;N. Masi;I. Moskalenko;S. Pensotti;T. Porter;L. Quadrani;P. Rancoita;D. Rozza;M. Tacconi
利用最新的实验结果，结合银河系和日球层中宇宙射线（CR）传播的最新模型，导出了能量范围为1 MeV ~ 1 TeV的CR电子的局域星际谱（LIS）。两个传播软件包，GALPROP和HelMod，结合起来，提供一个单一的框架，运行再现CR物种在不同的调制水平的直接测量，并在太阳磁场的两个极性。开发了一种迭代最大似然方法，该方法使用GALPROP预测的LIS作为HelMod的输入，HelMod提供了所选实验的特定时间段的调制光谱，用于模型数据比较。然后使用优化的HelMod参数来调整GALPROP参数以预测精细LIS，其中重复该过程以满足收敛标准。参数优化使用了1997年至2015年的大量质子光谱数据集。建议的CR电子LIS既可以容纳旅行者1号测量的低能星际光谱，也可以容纳PAMELA和AMS-02在日光层深处进行的高能观测;它还可以解释黄道平面外测量的X射线计数率特征。在这项研究中得出的星际和日光层传播参数与我们早期的CR质子，氦核，反质子传播和LIS在同一框架内获得的结果一致。
The local interstellar spectrum (LIS) of cosmic-ray (CR) electrons for the energy range 1 MeV to 1 TeV is derived using the most recent experimental results combined with the state-of-the-art models for CR propagation in the Galaxy and in the heliosphere. Two propagation packages, GALPROP and HelMod, are combined to provide a single framework that is run to reproduce direct measurements of CR species at different modulation levels, and at both polarities of the solar magnetic field. An iterative maximum-likelihood method is developed that uses GALPROP-predicted LIS as input to HelMod, which provides the modulated spectra for specific time periods of the selected experiments for model-data comparison. The optimized HelMod parameters are then used to adjust GALPROP parameters to predict a refined LIS with the procedure repeated subject to a convergence criterion. The parameter optimization uses an extensive data set of proton spectra from 1997 to 2015. The proposed CR electron LIS accommodates both the low-energy interstellar spectra measured by Voyager 1 as well as the high-energy observations by PAMELA and AMS-02 that are made deep in the heliosphere; it also accounts for Ulysses counting rate features measured out of the ecliptic plane. The interstellar and heliospheric propagation parameters derived in this study agree well with our earlier results for CR protons, helium nuclei, and anti-protons propagation and LIS obtained in the same framework.
影响因子：
8.6
作者：
M. Aguilar;D. Aisa;A. Alvino;G. Ambrosi;K. Andeen;L. Arruda;N. Attig;P. Azzarello;A. Bachlechner-A.
通讯作者：
M. Aguilar;D. Aisa;A. Alvino;G. Ambrosi;K. Andeen;L. Arruda;N. Attig;P. Azzarello;A. Bachlechner-A.
影响因子：
8.6
作者：
Accardo, L.;Aguilar, M.;Zurbach, C.
通讯作者：
Zurbach, C.
影响因子：
8.6
作者：
F. Aharonian;A. Akhperjanian;U. Barres de Almeida;A. R. Bazer-Bachi;Y. Becherini;B. Behera;W. Benbow-W.-Ben
通讯作者：
F. Aharonian;A. Akhperjanian;U. Barres de Almeida;A. R. Bazer-Bachi;Y. Becherini;B. Behera;W. Benbow-W.-Ben