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.
Highlights
Diurnal variation, being the measure of the galactic cosmic ray (GCR) anisotropy, arises from the Earth’s rotation as a ground-based detector’s viewing direction through the sky during each24-hours period
The present paper investigates the annual and 27-day waves of the GCR anisotropy based on ground observations of secondary cosmic rays by neutron monitors (NMs) and muon telescopes (MT) near the recent solar minimum
We investigate the relationship of the 27-day variation of the GCR anisotropy in the ecliptic plane and in the polar direction with parameters of solar activity and solar wind
Summary
Diurnal variation, being the measure of the galactic cosmic ray (GCR) anisotropy, arises from the Earth’s rotation as a ground-based detector’s viewing direction through the sky during each24-hours period. The present paper investigates the annual and 27-day waves of the GCR anisotropy based on ground observations of secondary cosmic rays by NMs and MTs near the recent solar minimum
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