Wavelet Analysis of Active Region Magnetic Structure

Details Wavelet Analysis of Active Region Magnetic Structure Wavelet Analysis of Active Region Magnetic Structure

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9322i&link_type=abstract

American Astronomical Society Meeting 210, #93.22; Bulletin of the American Astronomical Society, Vol. 39, p.214

Astronomy and Astrophysics

Astronomy

Scientific paper

A wavelet analysis is used to decompose active region magnetic fields into regions of different lengthscales, allowing one to examine the structure of the active region field at different lengthscales. Linesseparating opposite polarity groupings of flux at different lengthscales are found; these lines can be seen as a generalization of the notion of a magnetic neutral line. It is shown that the average magnetic field gradient for alpha, beta, beta-gamma, and beta-gamma-delta active regions increases in the order listed, and that the order is maintained over all length-scales. Further, the standard deviation and maximum of the magnetic field gradient, as well as the length of these generalized neutral lines, all share the same property. Since magnetic field gradient is strongly linked to active region activity, such as flares, this study demonstrates that, on average, the Mt. Wilson classification encodes the notion of activity over all lengthscales in the active region, and not just those lengthscales at which the strongest field gradients are found. This study uses the multiscale analysis toolkit Mkit developed by C. A. Young and presented elsewhere at this meeting.

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