Generation and Annihilation of Magnetic Helicity in Active Regions

Details Generation and Annihilation of Magnetic Helicity in Active Regions Generation and Annihilation of Magnetic Helicity in Active Regions

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..113k&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

Magnetic helicity in active regions is investigated based on the vector magnetograph observations and the three-dimensional magnetohydrodynamic simulations. First we measured the helicity flux through the photosphere into active regions using the magnetic data and the numerical technique to solve the induction equation inversely and found that the helicity flux forms a complicated structure in which the sign of helicity is easily changed within an active region. Secondly from the statistical analyses for various active regions it was shown that the absolute value of helicity flux rather than the net flux well correlate the coronal activity. Thirdly we revealed that for many flares the initial brightening in H-alpha and Trace 1600 A image located at a region where the helicity sign was sharply changed on the photosphere. Finally using the high resolution simulation we demonstrated that the explosive nonlinear reconnection can arise at the helicity inversion layer when the counter helicity is gradually injected due the photospheric motion. Based on the all results we conclude that the annihilation of both signs of magnetic helicity could be a key mechanism to drive coronal activity.

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