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arXiv 1909.01154astro-ph.HEphysics.space-ph
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扩展力场模型中随时间变化的AMS-02电子-正电子通量

Time-dependent AMS-02 electron-positron fluxes in an extended force-field model

Marco Kuhlen, Philipp Mertsch

摘要:

磁化的太阳风将日光层中的银河宇宙射线通量调制到高达40 GeV的刚性。在这项工作中,我们提出了一个新的和简单的扩展流行的,但有限的力场模型,从而提供了一个快速和强大的方法银河系宇宙射线的唯象研究。我们的半解析方法考虑到由于日光层磁场漂移的电荷符号相关的调制,并已通过比较完全数值代码进行验证。我们的模型很好地再现了随时间变化的AMS-02测量,我们发现扩散和漂移的强度与日光层倾斜角和磁场的大小密切相关。我们能够预测的电子和正电子通量超出了AMS-02测量的范围。我们已经公开了半分析模型的示例脚本,我们敦促社区采用这种方法进行现象学研究。

英文摘要:

The magnetised solar wind modulates the Galactic cosmic ray flux in the heliosphere up to rigidities as high as 40 GeV. In this work, we present a new and straightforward extension of the popular, but limited force-field model, thus providing a fast and robust method for phenomenological studies of Galactic cosmic rays. Our semi-analytical approach takes into account charge-sign dependent modulation due to drifts in the heliospheric magnetic field and has been validated via comparison to a fully numerical code. Our model nicely reproduces the time-dependent AMS-02 measurements and we find the strength of diffusion and drifts to be strongly correlated with the heliospheric tilt angle and magnitude of the magnetic field. We are able to predict the electron and positron fluxes beyond the range for which measurements by AMS-02 have been presented. We have made an example script for the semi-analytical model publicly available and we urge the community to adopt this approach for phenomenological studies.

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