Galactic Cosmic-Ray Anisotropy in the Northern hemisphere from the ARGO-YBJ Experiment during 2008-2012

Abstract

This paper reports on the observation of the sidereal large-scale anisotropy of cosmic rays using data collected by the ARGO-YBJ experiment over 5 years (2008$-$2012). This analysis extends previous work limited to the period from 2008 January to 2009 December,near the minimum of solar activity between cycles 23 and 24.With the new data sample the period of solar cycle 24 from near minimum to maximum is investigated. A new method is used to improve the energy reconstruction, allowing us to cover a much wider energy range, from 4 to 520 TeV. Below 100 TeV, the anisotropy is dominated by two wide regions, the so-called "tail-in" and "loss-cone" features. At higher energies, a dramatic change of the morphology is confirmed. The yearly time dependence of the anisotropy is investigated. Finally, no noticeable variation of cosmic-ray anisotropy with solar activity is observed for a median energy of 7 TeV.

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• Search for gamma-ray emission from the Sun during solar minimum with the ARGO-YBJ experiment
• Observation of Cosmic-Ray Anisotropy in the Southern Hemisphere with 12 yr of Data Collected by the IceCube Neutrino Observatory
• Implications of a Possible Spectral Structure of Cosmic-ray Protons Unveiled by the DAMPE
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• Cosmic-Ray Convection-Diffusion Anisotropy
• The Dipole Anisotropy of Galactic Cosmic Rays
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• Chaotic Behavior of Trapped Cosmic Rays
• The Influence of Sun's and Moon's Shadows on Cosmic-Ray Anisotropy
• Influence of interstellar environment near the solar system on cosmic-ray spectra and dipole anisotropy
• On the stochastic nature of Galactic cosmic-ray sources
• Joint constraint on the propagation origin of the cosmic-ray spectral knee from energy spectrum and anisotropy observations