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All Journal Indonesian Journal of Physics (IJP)
Baju Indradjaja
Departemen Astronomi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Fraktal dan Variabilitas dalam Siklus Bintik Matahari Dhani Herdiwijaya; Baju Indradjaja
Indonesian Journal of Physics Vol 13 No 2 (2002): Vol. 13 No.2, April 2002
Publisher : Institut Teknologi Bandung

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Abstract

Monthly sunspot numbers during period 1749 to 2000 were used to determine their fractal properties. Lomb’s algoritm and Morlet wavelet were applied to detect the distinct period of 11 year. By using Detrended Fluctuations Analysis (DFA), fractal dimension was measured. It is shown that during the last two centiries, 11-year wavelet amplitude showed doubled increment, in contrast with Gleissberg period. The evolution of fractal dimension varied in between 0.5 to 1.5, which imply that sunspot number time series are nonstationary and correlated to each other within 132-year period. The detected cross-over feature at D=1.3 corresponds to 11-year period and granulation size.
Co-Authors Dhani Herdiwijaya