Technique for Inferring Magnetic Helicity of Active Regions

Details Technique for Inferring Magnetic Helicity of Active Regions Technique for Inferring Magnetic Helicity of Active Regions

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..109c&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

The magnetic helicity content of a coronal volume may change over time at the presence of surface flows. When phtospheric magnetic fields are predominantly vertical it is possible to determine the rate of change of magnetic helicity using a time series of longitudinal magnetograms only since one can determine the horizontal component of velocity by tracking the displacements of magnetic flux fragments using the technique of local correlation (LCT). This technique has turned out to be very useful in revealing significant helicity changes that are associated with prominence formation and major flares. When magnetic fields are not vertical it is crucial to determine the vertical component of velocity too. A clever way of inferring it from the induction equation and the LCT-determined horizontal velocity has been proposed. However the results should be interpreted with a caution since the LCT may not yield even the correct value of the horizontal velocity component when magnetic fields are inclined to the vertical. Alternatively we are trying to make use of the full Stokes profile data taken by the NSO/ASP to determine the velocity vectors as well as magnetic field vectors.

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