# Puzzles of the cosmic ray anisotropy

## TL;DR

This paper reviews three unresolved issues in cosmic ray anisotropy at PeV energies, highlighting the inverse anisotropy, irregular energy dependence, and the influence of a single source.

## Contribution

It provides a detailed discussion of three key puzzles in cosmic ray anisotropy, emphasizing their significance and current challenges.

## Key findings

- Identification of inverse anisotropy as a puzzle
- Irregular energy dependence of anisotropy parameters
- Potential impact of a single source on anisotropy patterns

## Abstract

We discuss three of the known puzzles of the cosmic ray anisotropy in the PeV and sub-PeV energy region. They are: (1) the so called inverse anisotropy, (2) the irregularity in the energy dependence of the amplitude and phase of the first harmonic and (3) the contribution of the single source.