TITLE:
Multifractal Detrended Fluctuation Analysis of Solar Wind Speed and Interplanetary Magnetic Field during Solar Cycle 24
AUTHORS:
Adébiyi Joseph Adéchinan, Tokpanoudé D. Judicaël, Kpomahou Y. J. Fernando
KEYWORDS:
Wind Speed, Magnetic Field, Fluctuation, MFDFA, Solar Cycle 24
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.15 No.10,
October
11,
2025
ABSTRACT: This paper investigates the nature of the fluctuation of both solar wind speed and the interplanetary magnetic field intensity during solar cycle 24. Since detrended multifractal fluctuation analysis can provide information about the internal regularity, randomness, and long-term correlation of time series, we applied this technique to our two time series data to better understand their evolution regularity and analyze their multifractal behavior. The results indicate the existence of strong multifractal characteristics in both data sets studied. According to the width of the multifractal spectra of the two series, the solar wind speed exhibits a more complex multifractal behavior than the interplanetary magnetic field. The different parameters from the multifractal spectra show that this multifractality is dependent on both a fat-tailed probability density function and long-range temporal correlations. Furthermore, the multifractality identified in both time series appears to be associated with an energy cascade process.