PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - CRD - Cosmic Ray Direct
Harmonic Interference of Earth's Orbital Velocity and the Sidereal Cosmic Ray Anisotropy
J.C. Díaz Vélez*, P. Desiati, R. Abbasi and F. McNally
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Pre-published on: July 05, 2021
Published on:
Abstract
When cosmic-ray arrival directions are observed in celestial coordinates, they appear to have a small anisotropy whose origin is still largely unknown. In addition to this celestial anisotropy, the Earth's revolution around the Sun produces a faint Compton-Getting dipole anisotropy with an excess oriented towards the direction of motion in solar coordinates. The relative rotation of the celestial and solar reference frames over a calendar year causes interference between the two sources of anisotropy. It is possible to characterize the resulting yearly modulations by studying the side-bands to the diurnal and sidereal frequencies in anti- and extended-sidereal time frames. This work provides a numerical simulation of the interference between anisotropies in sidereal and solar reference frames to predict the distributions in anti-sidereal and extended-sidereal frames.
DOI: https://doi.org/10.22323/1.395.0085
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