Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..117g&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
We outline a simple method to monitor variations of the magnetic helicity the current helicity and the non-potential (free) magnetic energy on the photospheric boundary of solar active regions. Explicit manifestations of dynamical activity in the solar atmosphere such as flares coronal mass ejections and filament eruptions may be related to these variations. While similar methods require knowledge of the vector potential and the velocity field vector on the photosphere our method requires only the photospheric potential magnetic field corresponding to the observed magnetograms. The calculation of the potential field for any given magnetogram is straightforward. Moreover our method relies on the constant-alpha force-free approximation assumed to hold in the active region. Whether the above is a realistic assumption can be tested using an array of well-documented methods. Therefore our technique may prove quite useful to at least a subset of active regions in which the linear force-free approximation is justifiable.
Georgoulis Manolis K.
LaBonte Barry J.
Rust David Maurice
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