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Temporal evolution of fractality in the Earth's magnetosphere and the solar photosphere
Author(s) -
Domínguez Macarena,
Muñoz Víctor,
Valdivia Juan Alejandro
Publication year - 2014
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2013ja019433
Subject(s) - magnetogram , physics , photosphere , coronal mass ejection , solar cycle , nanoflares , magnetosphere , solar flare , solar cycle 23 , fractal , fractal dimension , solar maximum , sunspot , corona (planetary geology) , astrophysics , astronomy , solar wind , magnetic field , magnetic flux , spectral line , mathematics , astrobiology , mathematical analysis , quantum mechanics , venus
The study of complexity in two aspects of the magnetic activity in the Sun‐Earth system is presented. We compare the temporal evolution of the magnetic fluctuations in the Earth's magnetosphere and the spatial distribution of the magnetic field in the solar photosphere, by calculating fractal dimensions from the data. It is found that the fractal dimension of the Dst data decreases during magnetic storm states and is well correlated with other indexes of solar activity, such as the solar flare and coronal indexes. This correlation holds for individual storms, full‐year data, and the complete 23rd solar cycle. The fractal dimension from solar magnetogram data also correlates well with both the Dst index and solar flare index, although the correlation is much more clear at the larger temporal scale of the 23rd solar cycle, showing a clear increase around solar maximum.