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Vector Magnetic Fields and Current Helicities in Coronal Holes and Quiet Regions View all abstracts by submitter

Shuhong Yang   Submitted: 2010-11-01 21:50

In the solar photosphere, many properties of coronal holes (CHs) are not known, especially vector magnetic fields. Using observations from Hinode, we investigate vector magnetic fields, current densities and current helicities in two CHs and compare them with two normal quiet regions (QRs) for the first time. We find that, in the CHs and QRs, the areas where large current helicities are located are mainly co-spatial with strong vertical and horizontal field elements both in shape and location. In the CHs, horizontal magnetic fields, inclination angles, current densities and current helicities are larger than those in the QRs. The mean vertical current density and current helicity, averaged over all the observed areas including the CHs and QRs, are approximately 0.008 A m-2 and 0.005 G^2 m-1, respectively. The mean current density in magnetic flux concentrations where the vertical fields are stronger than 100 G is as large as 0.012 ? 0.001 A m-2, consistent with that in the flare productive active regions. Our results imply that the magnetic fields, especially the strong fields, both in the CHs and QRs are nonpotential.

Authors: Shuhong Yang, Jun Zhang, Ting Li, Mingde Ding
Projects: Hinode/SOT

Publication Status: ApJ (accepted)
Last Modified: 2010-11-02 09:28
Go to main E-Print page  First SDO AIA Observations of a Global Coronal EUV ''Wave'': Multiple Components and ''Ripples''  Magnetic Topology of Coronal Hole Linkages  Edit Entry  Download Preprint  Delete Entry 

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