Evaluation of the Interplanetary Magnetic Field Strength Using the Cosmic-Ray Shadow of the Sun

(The Tibet ASγ Collaboration)

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We analyze the Sun's shadow observed with the Tibet-III air shower array and find that the shadow's center deviates northward (southward) from the optical solar disk center in the "away" ("toward") interplanetary magnetic field (IMF) sector. By comparing with numerical simulations based on the solar magnetic field model, we find that the average IMF strength in the away (toward) sector is 1.54±0.21stat±0.20syst (1.62±0.15stat±0.22syst) times larger than the model prediction. These demonstrate that the observed Sun's shadow is a useful tool for the quantitative evaluation of the average solar magnetic field.

Original languageEnglish
Article number031101
JournalPhysical Review Letters
Volume120
Issue number3
DOIs
Publication statusPublished - 2018 Jan 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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