Fractal dimensions of solar activity

Details Fractal dimensions of solar activity Fractal dimensions of solar activity

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..158..365w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 158, no. 2, p. 365-377

Physics

6

Fractals, Solar Activity, Solar Cycles, Solar Physics, Sun, Indexes (Ratios), Nimbus 7 Satellite, Periodic Variations, Solar Flux, Solar Radio Emission

Scientific paper

Solar activity changes in amplitude and long-term behavior irregularly. Fractal theory is used to examine the variation of solar activity, using daily solar indices (i.e., sunspot number, 10.7 cm radio flux, the SME L alpha, Fe XIV coronal emission, and the total solar irradiance measured by the Earth Radiation Budget (ERG) on the NIMBUS-7. It can handle irregular variations quantitatively. The fractal dimension of 10.7 cm radio fluxes in cycle 21 for periods of approximately 7 days or less was 1.28, 1.3 for periods longer than approximately 272 days, and 1.86 for periods between them, for example. Fractal dimensions for other solar indices show similar tendencies. These results suggest that solar activity varies more irregularly for time scales that are longer than several days and shorter than several months. Yearly values of fractal dimensions and bending points do not change in concert with the solar cycle.

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