On Complexity of Solar Magnetic Fields

Details On Complexity of Solar Magnetic Fields On Complexity of Solar Magnetic Fields

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996alab.rept.....m&link_type=abstract

Technical Report, Alabama Univ. Huntsville, AL United States Dept. of Mechanical and Aerospace Engineering.

Astronomy and Astrophysics

Astronomy

Solar Flares, Solar Magnetic Field, Temporal Distribution, Fractals, Sunspots, Data Processing, Data Reduction, Magnetic Signatures, Solar Terrestrial Interactions, Solar Convection (Astronomy)

Scientific paper

Observational data collected by solar magnetographs from different places around the world seem to clearly indicate that the onset of flares is related to the structure of sunspot magnetic fields. The simple, but not necessarily always valid, rule is that the more complex the structure of the field the more flares are produced. Until now, estimates of the magnetic field complexity were mostly subjective. An important problem is how to quantify the field complexity by using rigorous methods of data analysis. In the completed research we have used several fractal techniques to address the problem. We have adopted the well=-known concept of fractal dimension, to quantify the field complexity and to search for temporal variations of this complexity. We have calculated the fractal dimension for a chosen magnetic field data set acquired by the NASA/MSFC vector magnetograph and searched for temporal changes in the computed fractal dimension which may be related to the onset of solar flares. The analysis was performed on magnetic field data collected from solar active regions that showed different levels of flare activity as well as from non-flaring regions.

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