The main periodicities in the minimum extreme temperature in northern Mexico and their relation with solar variability Original Research Article

Three data series from different meteorological stations in northern Mexico are spectrally analyzed in order to look for solar activity signals. The series cover a period from January 1929 to December 1974. From the spectral analysis a periodicity of around 5 years is present in all the series, which can be considered as a harmonic of the sunspot number. Other periodicities can be related either to some solar phenomena like cosmic ray fluxes, storm sudden commencements, solar magnetic flux emergence and geomagnetic activity, or to meteorological phenomena like the quasi-biennial oscillation.