Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - SH - Solar & Heliospheric
Neutron Monitor Comparison by Spectral Analysis in relation to Cosmic Ray Intensity in the period 2013-2018
A. López Comazzi
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Pre-published on: July 22, 2019
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Abstract
Morlet Wavelet Analysis is applied to the period 2013--2018 corresponding to the decreasing phase of the solar cycle 24. The aim is to identify characteristic periodicities between days to one years in the neutron monitor counting rates of a set of 22 neutron monitors distributed around the world and at different elevation above sea level (a.s.l). Six periodicities are observed once the one day period is removed: The synodic solar rotation (27--28.3 days) and its second harmonic, the near annual period and 47, 93 and 133 days periods. The last one is especially strong since 2014. An artificial neutron monitor power spectrum has been built by averaging the obtained power spectrum of the 22 neutron monitors. This average power spectrum is used as reference for the rest of neutron monitors. After the comparison, we have defined two indices, $Q_{j}$ and $Q_{x}$, the first one determines how much the power spectrum of a single station differs with respect to the reference spectrum and the second one is the weighted cross-correlation between a single neutron monitor and the other 21. Finally, we define a station factor quality as the mean value of $Q_{j}$ and $Q_{x}$.
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