Three dimensional solar anisotropy of galactic cosmic rays near the recent solar minimum 23/24

TL;DR

This study analyzes the three-dimensional anisotropy of galactic cosmic rays during the 2006-2012 period, revealing periodicities and their relation to solar activity and wind near the recent solar minimum.

Contribution

It provides a comprehensive 3D analysis of GCR anisotropy using neutron monitor and muon telescope data, highlighting quasi-periodicities and their solar wind correlations.

Findings

Identified annual and 27-day periodicities in GCR anisotropy.

Established links between GCR anisotropy variations and solar activity parameters.

Analyzed both in-ecliptic and polar anisotropy components.

Abstract

Three dimensional (3D) galactic cosmic ray (GCR) anisotropy has been studied for 2006- 2012. The GCR anisotropy, both in the ecliptic plane and in polar direction, were obtained based on the neutron monitors (NMs) and Nagoya muon telescopes (MT) data. We analyze two dimensional (2D) GCR anisotropy in the ecliptic plane and north-south anisotropy normal to the ecliptic plane. We reveal quasi-periodicities - the annual and 27-days waves in the GCR anisotropy in 2006-2012. We investigate the relationship of the 27-day variation of the GCR anisotropy in the ecliptic plane and in the polar direction with the parameters of solar activity and solar wind.