Análisis de tendencias de heliofanía efectiva en Argentina

results of the statistic analysis of time series of annual averages of hours of solar brightness registered in stations of argentina are presented; these values compensate the insufficiency of data of solar irradiation and allow studying tendencies related to the global climatic change. the measurement error was taken into account in a previous study of consistency, temporal analysis is made with the application of the test of mann-kendall and the obtained results are discussed. they appear some stations in which the annual averages of hours of solar brightness decrease significantly, grouping itself essentially in a zone located to the northeast of humid pampas and to the south of the mesopotamia.