On the trend of Atlantic Hurricane with Cosmic Rays

The purpose of this study is to examine the cosmophysical periodicities that could possible be re- lated with a modulation in the process of hurricanes development. One of the ways to analyze two non- stationary series, to discern whether there is a linear relation or not is by means of the Coherence Wavelet method, which furnish valuable information about when and which periodicity do coincide in time, and about its nature, linear or non-linear relation, provided there is not a noticeable diphase among them. In the present work we use the Morlet wavelet technique for the annual number of North Atlantic hurricanes between 1851 and 2005. To find the relationship between hurricanes and cosmophysical phenomena series in time- frequency space, we use then the Wavelet Coherence analysis: it is found that the more prominent periodicity with a coherence > 0.95, is that of 30 ± 2 yrs. Our results point toward a relationship between Cosmic Rays and terrestrial phenomena, e.g. the Atlantic Multidecadal Oscillation (AMO), the sea-surface temperature (SST) and number of Hurricanes and others , all them with a common periodicity of 30 yrs.