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Magnetic Helicity in Emerging Solar Active Regions View all abstracts by submitter

Yang Liu   Submitted: 2014-02-21 15:41

Using vector magnetic field data from the Helioseismic and MagneticImager (HMI) instrument aboard the Solar Dynamics Observatory (SDO),we study magnetic helicity injection into the corona in emergingactive regions and examine the hemispheric helicity rule. In everyregion studied, photospheric shearing motion contributes most of thehelicity accumulated in the corona. In a sample of 28 emerging activeregions, 17 active regions follow the hemisphere rule (61% ± 18% at a95% confidence interval). Magnetic helicity and twist in 25 activeregions (89% ± 11%) have the same sign. The maximum magnetic twist,which depends on the size of an active region, is inferred in a sampleof 23 emerging active regions with a bipolar magnetic fieldconfiguration.Coronal holes are regions on the Sun's surface that mapthe footprints of open magnetic field lines. We have developed anautomated routine to detect and track boundaries of long-lived coronalholes using full-disk extreme-ultraviolet (EUV) images obtained bySOHO

Authors: Y. Liu, J. T. Hoeksema, M. Bobra, K. Hayashi, P. W. Schuck, X. Sun
Projects: SDO-HMI

Publication Status: ApJ., accepted.
Last Modified: 2014-02-24 13:04
Go to main E-Print page  A model for the formation of the active region corona driven by magnetic flux emergence  The Magnetic Field of Active Region 11158 During the 2011 February 12-17 Flares :                 Differences between Photospheric Extrapolation and Coronal Forward-Fitting Methods  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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