Abstract
In this paper we use a long-term record of the Schumann resonance (SR) intensity observed in Nakatsugawa, Japan and global lightning activity to study the global temperature change. The cumulative magnetic field energy from the first and second modes of SR intensity for 4 years is derived for two horizontal components. The monthly dependence of field energy is compared with the global lightning and temperature data for the corresponding time period. As a result SR energy is found to be correlated well with the temperature in the middle latitude and global lightning activity. Furthermore the principal component analysis (PCA) is applied to extract the periodical component in each data set. The annual component of SR energy has a significant correlation with the middle latitude temperature, whilst the semi-annual component of the SR energy has a significant correlation with low latitude temperature. The correlation pattern varies with magnetic components and the contribution from African and Asian thunderstorm activity to the global SR is studied.
