12-20 July 2017
Asia/Seoul timezone
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BEXCO - Room C(106/107)

[SH014] Measurement of the Solar Magnetic Field effect on cosmic rays using the Sun shadow observed by the ARGO-YBJ experiment


  • Songzhan CHEN

Primary authors



The cosmic rays originating outside the solar system are blocked by the Sun and form a shadow in the sky map, whose shape is affected by the magnetic field between the Sun and the Earth. Therefore the Sun shadow can be used as a probe of the magnetic field and its intensity variations. In this work, we report on the observation of the energy dependent variation of the Sun shadow signal in the energy range 0.4-500 TeV, using the ARGO-YBJ data collected in the years from 2008 to 2012, when the solar activity varied from the minimum to the maximum. The Moon shadow is also investigated and used to remove the geomagnetic effect on the Sun shadow. According to our measurement, the solar magnetic field significantly affects the flux of cosmic rays with energy lower than 100 TeV, that appear to be strongly correlated with the solar activity, while at higher energies the solar influence is less evident. We also discuss the possibility to study the different magnetic field components around the Sun.