Solar magnetic field strength and the "Sun's Shadow"

Tibet ASγCollaboration

Research output: Contribution to journalConference articlepeer-review


The angular displacement of the center of the observed Sun's shadow from the center of the optical solar disc tells us the information of average solar magnetic field strength in the space between the Sun and the Earth. We analyze the displacement of the Sun's shadow observed in 5 ∼ 240 TeV cosmic-ray intensity with the Tibet-III air shower array during 10 years between 2000 and 2009, and compare with the MC simulations based on the coronal magnetic field model and Parker's spiral interplanetary magnetic field model. We find that the observed North-South displacement is significantly larger than the prediction of simulations. This result uniquely suggests the underestimation of the average field strength between the Sun and the Earth in our model. In this work, we will report the actual solar magnetic field strength evaluated from the observed Sun's shadow.

Original languageEnglish
JournalProceedings of Science
Publication statusPublished - 2017 Jan 1
Externally publishedYes
Event35th International Cosmic Ray Conference, ICRC 2017 - Bexco, Busan, Korea, Republic of
Duration: 2017 Jul 102017 Jul 20

ASJC Scopus subject areas

  • General


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