Deciphering the Dipole Anisotropy of Galactic Cosmic Rays
Abstract
Recent measurements of the dipole anisotropy in the arrival directions of Galactic cosmic rays (CRs) indicate a strong energy dependence of the dipole amplitude and phase in the TeV-PeV range. We argue here that these observations can be well understood within standard diffusion theory as a combined effect of (i) one or more local sources at Galactic longitude 120deg < l < 300deg dominating the CR gradient below 0.1-0.3 PeV, (ii) the presence of a strong ordered magnetic field in our local environment, (iii) the relative motion of the solar system, and (iv) the limited reconstruction capabilities of ground-based observatories. We show that an excellent candidate of the local CR source responsible for the dipole anisotropy at 1-100 TeV is the Vela supernova remnant.
Keywords
Cite
@article{arxiv.1605.06446,
title = {Deciphering the Dipole Anisotropy of Galactic Cosmic Rays},
author = {Markus Ahlers},
journal= {arXiv preprint arXiv:1605.06446},
year = {2016}
}
Comments
version published in Phys. Rev. Lett. 117, 151103 (2016)