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Geomagnetic Shielding in the Spectra of High-Energy Particles.

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Title: Geomagnetic Shielding in the Spectra of High-Energy Particles.
Authors: Kozak, L. V.1,2 (AUTHOR) gutovska@ukr.net, Mylka, O. Yu.1 (AUTHOR), Petrenko, B. A.1,2 (AUTHOR), Khalimonenko, N. O.1 (AUTHOR), Ballai, I.3 (AUTHOR)
Source: Kinematics & Physics of Celestial Bodies. Oct2026, Vol. 42 Issue 5, p199-209. 11p.
Subject Terms: *Magnetosphere, *Geomagnetic variations, *Magnetospheric physics, *Relativistic particles, *Solar energetic particles, *Monte Carlo method, *Neutron measurement
Abstract: The Earth's magnetosphere acts as an energy- and direction-selective filter for high-energy charged particles and, thus, modifies the nonthermal radiation spectrum observed at the ground. The authors developed a physically motivated description of geomagnetic shielding in terms of an effective phase-space potential barrier, introduced the magnetospheric transmission function T(R, t), and formulated a criterion for the transition to the spectral-modulation regime by the magnetic field. To quantify T(R, t) and the temporal evolution of the cutoff rigidity Rc(t), Monte Carlo trajectory tracing in realistic magnetic-field configurations (IGRF internal field plus external current systems) is employed. Using the June 7–8, 2024, event, we compared the model with neutron monitor data (Apatity, Oulu, South Pole) and calibrated the linear parameterization Rc(t) = Rc,0 + αDst(t). It was found that α = (4 ± 0.6) × 10−5 GV/nT within the event window, implying very small cutoff variations (≲1.5 × 10−3 GV) under modest Dst changes (tens of nT). This separation of magnetospheric filtering from source-driven processes (acceleration/transport) suggests that the observed spectral evolution in this event is predominantly of solar/heliospheric origin. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
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  Label: Title
  Group: Ti
  Data: Geomagnetic Shielding in the Spectra of High-Energy Particles.
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  Data: <searchLink fieldCode="AR" term="%22Kozak%2C+L%2E+V%2E%22">Kozak, L. V.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> gutovska@ukr.net</i><br /><searchLink fieldCode="AR" term="%22Mylka%2C+O%2E+Yu%2E%22">Mylka, O. Yu.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Petrenko%2C+B%2E+A%2E%22">Petrenko, B. A.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khalimonenko%2C+N%2E+O%2E%22">Khalimonenko, N. O.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ballai%2C+I%2E%22">Ballai, I.</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Kinematics+%26+Physics+of+Celestial+Bodies%22">Kinematics & Physics of Celestial Bodies</searchLink>. Oct2026, Vol. 42 Issue 5, p199-209. 11p.
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  Data: *<searchLink fieldCode="DE" term="%22Magnetosphere%22">Magnetosphere</searchLink><br />*<searchLink fieldCode="DE" term="%22Geomagnetic+variations%22">Geomagnetic variations</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetospheric+physics%22">Magnetospheric physics</searchLink><br />*<searchLink fieldCode="DE" term="%22Relativistic+particles%22">Relativistic particles</searchLink><br />*<searchLink fieldCode="DE" term="%22Solar+energetic+particles%22">Solar energetic particles</searchLink><br />*<searchLink fieldCode="DE" term="%22Monte+Carlo+method%22">Monte Carlo method</searchLink><br />*<searchLink fieldCode="DE" term="%22Neutron+measurement%22">Neutron measurement</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Earth's magnetosphere acts as an energy- and direction-selective filter for high-energy charged particles and, thus, modifies the nonthermal radiation spectrum observed at the ground. The authors developed a physically motivated description of geomagnetic shielding in terms of an effective phase-space potential barrier, introduced the magnetospheric transmission function T(R, t), and formulated a criterion for the transition to the spectral-modulation regime by the magnetic field. To quantify T(R, t) and the temporal evolution of the cutoff rigidity Rc(t), Monte Carlo trajectory tracing in realistic magnetic-field configurations (IGRF internal field plus external current systems) is employed. Using the June 7–8, 2024, event, we compared the model with neutron monitor data (Apatity, Oulu, South Pole) and calibrated the linear parameterization Rc(t) = Rc,0 + αDst(t). It was found that α = (4 ± 0.6) × 10−5 GV/nT within the event window, implying very small cutoff variations (≲1.5 × 10−3 GV) under modest Dst changes (tens of nT). This separation of magnetospheric filtering from source-driven processes (acceleration/transport) suggests that the observed spectral evolution in this event is predominantly of solar/heliospheric origin. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.3103/S0884591326050041
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 199
    Subjects:
      – SubjectFull: Magnetosphere
        Type: general
      – SubjectFull: Geomagnetic variations
        Type: general
      – SubjectFull: Magnetospheric physics
        Type: general
      – SubjectFull: Relativistic particles
        Type: general
      – SubjectFull: Solar energetic particles
        Type: general
      – SubjectFull: Monte Carlo method
        Type: general
      – SubjectFull: Neutron measurement
        Type: general
    Titles:
      – TitleFull: Geomagnetic Shielding in the Spectra of High-Energy Particles.
        Type: main
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            NameFull: Kozak, L. V.
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            NameFull: Mylka, O. Yu.
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            NameFull: Petrenko, B. A.
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            NameFull: Khalimonenko, N. O.
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            NameFull: Ballai, I.
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            – D: 01
              M: 10
              Text: Oct2026
              Type: published
              Y: 2026
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              Value: 42
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              Value: 5
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            – TitleFull: Kinematics & Physics of Celestial Bodies
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