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Purpose <p>This paper presents a method to determine the geomagnetic cutoff rigidity using data collected by the Alpha Magnetic Spectrometer (AMS).</p> Methods <p>The geomagnetic cutoff rigidities are derived by fitting a transition function to the ratios of measured cosmic-ray event-rate spectra at different locations to the reference in regions with the lowest cutoff rigidities.</p> Results <p>The geomagnetic cutoff rigidities measured on a <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(1^\circ \times 1^\circ \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mn>1</mn> <mo>∘</mo> </msup> <mo>×</mo> <msup> <mn>1</mn> <mo>∘</mo> </msup> </mrow> </math></EquationSource> </InlineEquation> longitude–latitude grid are in good agreement with calculations based on the International Geomagnetic Reference Field (IGRF) model in regions with geomagnetic latitude <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(|\theta _M |&lt;30^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mrow> <mo stretchy="false">|</mo> </mrow> <msub> <mi>θ</mi> <mi>M</mi> </msub> <mrow> <mo stretchy="false">|</mo> <mo>&lt;</mo> </mrow> <msup> <mn>30</mn> <mo>∘</mo> </msup> </mrow> </math></EquationSource> </InlineEquation>. A year-by-year analysis reveals no pronounced temporal variation in the cutoff rigidity.</p> Conclusions <p>This method enables precise measurements of the geomagnetic cutoff rigidity directly from measured cosmic-ray data, without relying on geomagnetic-field models.</p>

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Measurement of the geomagnetic cutoff rigidity for cosmic rays with the alpha magnetic spectrometer

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Haotian Yang,
  • Zhicheng Tang,
  • Cheng Zhang,
  • Senquan Lu,
  • Zetong Sun,
  • Shanglin Li,
  • Yuhang You,
  • Hao Chen,
  • Hengyi Cai,
  • Zixuan Yan,
  • Yie Tian,
  • Hongqing Wu,
  • Zuhao Li

摘要

Purpose

This paper presents a method to determine the geomagnetic cutoff rigidity using data collected by the Alpha Magnetic Spectrometer (AMS).

Methods

The geomagnetic cutoff rigidities are derived by fitting a transition function to the ratios of measured cosmic-ray event-rate spectra at different locations to the reference in regions with the lowest cutoff rigidities.

Results

The geomagnetic cutoff rigidities measured on a \(1^\circ \times 1^\circ \) 1 ∘ × 1 ∘ longitude–latitude grid are in good agreement with calculations based on the International Geomagnetic Reference Field (IGRF) model in regions with geomagnetic latitude \(|\theta _M |<30^{\circ }\) | θ M | < 30 ∘ . A year-by-year analysis reveals no pronounced temporal variation in the cutoff rigidity.

Conclusions

This method enables precise measurements of the geomagnetic cutoff rigidity directly from measured cosmic-ray data, without relying on geomagnetic-field models.