What does this research mean for the field?

During the June 7–8, 2024 event, geomagnetic cutoff rigidity variations were extremely small under modest Dst changes, indicating that the observed spectral evolution of high-energy particles was predominantly driven by solar and heliospheric processes rather than magnetospheric filtering. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To develop a physical model of geomagnetic shielding and quantify how magnetospheric filtering alters the spectra of high-energy charged particles measured at ground level.

September 2, 2026Kinematics and Physics of Celestial Bodies

Geomagnetic Shielding in the Spectra of High-Energy Particles

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Authors

LKL. V. Kozak OMO. Yu. MylkaTaras Shevchenko National University of Kyiv BPB. A. Petrenko

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Implication

Computational modeling reveals minimal geomagnetic cutoff rigidity shifts during a solar particle event, indicating observed spectral changes originate primarily in interplanetary space.

Key Points

To develop a physical model of geomagnetic shielding and quantify how magnetospheric filtering alters the spectra of high-energy charged particles measured at ground level.
Formulated a transmission function based on an effective phase-space potential barrier and simulated particle paths via Monte Carlo trajectory tracing using IGRF and external magnetic field models.
Analyzed the June 7–8, 2024, solar particle event using ground-based neutron monitor recordings from Apatity, Oulu, and the South Pole.
Calibrated the relationship between temporal cutoff rigidity variations and the geomagnetic disturbance storm time (Dst) index.
Calibrated the linear parameterization Rc(t) = Rc,0 + αDst(t) to yield a sensitivity coefficient of α = (4 ± 0.6) × 10⁻⁵ GV/nT.
Demonstrated that modest geomagnetic variations of tens of nT generate negligible cutoff rigidity shifts of ≲1.5 × 10⁻³ GV.
Determined that the spectral evolution observed during the June 7–8, 2024, event stemmed primarily from solar and heliospheric acceleration processes rather than magnetospheric filtering.

Cite This Study

Kozak et al. (2026) studied this question.

synapsesocial.com/papers/6a97e2f6c562ede874ec7639 https://doi.org/10.3103/s0884591326050041

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Implication

Computational modeling reveals minimal geomagnetic cutoff rigidity shifts during a solar particle event, indicating observed spectral changes originate primarily in interplanetary space.

Geomagnetic Shielding in the Spectra of High-Energy Particles

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Member takes

Implication

Key Points

Cite This Study

Geomagnetic Shielding in the Spectra of High-Energy Particles

Discussion

Member takes

Implication

Key Points

Cite This Study

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