MULTIFRACTAL ANALYSIS OF SOLAR RADIATION IN THE NORTHEASTERN REGION OF BRAZIL

In this work, we used hourly data of high frequency of solar radiation from the entire Northeast region of Brazil. We used the Multifractal Detrended Fluctuation Analysis (MFDFA) method to analyze the characteristics of the solar radiation series in 137 meteorological stations from 2010 to 2022. For all analyzed series, the parameter alpha(0) > 0.5 characterizes persistent series. The values of r > 1 reveal asymmetry to the right, indicating that large fluctuations contributed to the multifractality process. The states of Maranhao and Bahia presented the highest values of spectrum width W, indicating greater complexity. We found that long-range correlations are the leading cause of multifractality observed in the dynamics of the series of solar radiation anomalies.