Abstract
Abstract. During the past decade, multiple observatories have reported significant observations of the anisotropy of cosmic rays in the TeV energy band. The anisotropy has been observed at large scales and small scales in both the Northern and Southern Hemispheres. The source of the anisotropy is not well-understood, though both a galactic and a heliospheric origin have been suggested. We discuss recent observations of the shape and energy dependence of the anisotropy, with particular attention to measurements by the IceCube Neutrino Observatory in the Southern Hemisphere and the Milagro and High-Altitude Water Cherenkov (HAWC) observatories in the Northern Hemisphere.
Highlights
Recent observations of the distribution of arrival directions of TeV cosmic rays at Earth have demonstrated the presence of an anisotropy at an intensity level of 10−3
Including all observations performed during the past decade, the intensity of the large-scale anisotropy has been investigated between 1 TeV and 1 PeV, and the time dependence of the large-scale structure has been observed continuously over the most recent solar cycle
A 10−3 anisotropy in the TeV–PeV cosmic rays has been established with a full decade of observations in both the Northern and Southern Hemispheres
Summary
Recent observations of the distribution of arrival directions of TeV cosmic rays at Earth have demonstrated the presence of an anisotropy at an intensity level of 10−3. The anisotropy has been observed on both large angular scales (> 60◦ in extent) and small scales (< 20◦) over the full sky. Including all observations performed during the past decade, the intensity of the large-scale anisotropy has been investigated between 1 TeV and 1 PeV, and the time dependence of the large-scale structure has been observed continuously over the most recent solar cycle. The source of the anisotropy is not well-understood, we describe several origin scenarios as the data are presented
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