Dependence of the cutoff latitude of solar energetic protons on the southward component of the IMF

H. Shimazu, T. Tanaka, M. Den, T. Obara

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We performed simulations of the entry of solar energetic protons, at energies of 1 and 10 MeV, into the earth's magnetosphere. The proton trajectories were traced from the upstream part of the solar wind in electric and magnetic fields obtained from a global MHD simulation data. We investigated how the protons' access to high latitudes varied depending on the energy and on the interplanetary magnetic field direction. The results showed that the cutoff latitude of 1 MeV protons becomes lower when the north-south component of the interplanetary magnetic field turns from the north to the south. In contrast, the cutoff latitude of 10 MeV protons was not much affected by the change of the component.

Original languageEnglish
Pages (from-to)503-506
Number of pages4
JournalAdvances in Space Research
Volume38
Issue number3
DOIs
Publication statusPublished - 2006
Externally publishedYes

Keywords

  • Cutoff latitude
  • Entry into the magnetosphere
  • Solar energetic proton

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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