Variations of cosmic rays muon intensity in the declining phase of the 23rd solar cycle in ground and shallow underground data

TL;DR

This study analyzes cosmic-ray muon intensity variations during the declining phase of the 23rd solar cycle using ground and underground detectors, revealing significant periodicities and discussing their possible origins.

Contribution

It provides the first detailed power spectra analysis of cosmic-ray muon data from Belgrade detectors during this solar cycle phase, identifying significant periodicities.

Findings

Significant peaks in power spectra from both ground and underground data.

Detection of periodicities possibly linked to solar activity.

Discussion of potential origins of observed periodicities.

Abstract

The cosmic-ray intensity record from Belgrade muon detectors in the period 2002-2004 is subjected to power spectra analysis. Statistically significant peaks are found in datasets from both ground and underground (25 m w.e.) detectors. The possible origin of these periodicities is discussed.