Solar Physics Division Meeting 2000, June 19-22
Session 1. Helioseismology, Magnetic Fields, Chromosphere and Transition Region
Display, Chair: C. U. Keller, Monday-Thursday, June 19, 2000, 8:00am-6:00pm, Forum Ballroom

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[1.45] Electric Current Systems in Solar Active Regions

B. J. LaBonte, D. L. Mickey (University of Hawaii, Institute for Astronomy)

The first study to show the persistence of local field-aligned current systems in active regions was reported by Pevtsov, Canfield, and Metcalf (Astrophys. J., 425, L117, 1994). Their work was limited to a sample of complex, flare-productive regions because of the sensitivity limit of the data from the Haleakala Stokes Polarimeter.

I report here on a new survey of active regions with the Imaging Vector Magnetograph (IVM) at Mees Solar Observatory. The IVM data permit a look at current systems in simpler, more typical active regions, because of better sensitivity, temporal sampling, spatial resolution and field-of-view. Small scale current systems are commonly seen. Transport of current systems by advective processes is commonly seen over times of hours.

This work was supported by NASA grant NAG5-4941 and by a subcontract with LMSAL in support of NASA contract NAS8-40801 for YOHKOH SXT.

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