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Large Scale Coronal Magnetic Field Reconfigurations and Eruptive Events
We report on our progress in attempting to understand the relationship
between changes in the configuration of the large scale coronal magnetic
field and CMEs. This approach has been motivated by the association of
the subsequent ICMEs with solar wind electron heat flux anisotropies. The
presence of intervals of counter-streaming and/or notable reduction in
the heat flux in ICMEs suggests that newly opening or disconnected field
structures are involved in the causative eruptions. Our examination of
changes in the open/closed structures, using data-based potential field
source surface models, shows that changes are often seen in the central
meridian region preceding the arrival of an ICME. These changes may involve
the coronal hole structure and can be related to either evolving active
regions or background photospheric fields. We show some examples both from
the workshop study periods, and from our more general analyses of both
the underlying concept and the observations.
Authors: J.G. Luhmann and Yan Li
(UC Berkeley); J.T. Hoeksema and X.P. Zhao (Stanford U); N. Arge (CIRES
U of Colorado, NOAA/SEC)
Organization: Space Sciences Lab, UC Berkeley
Address: Space Sciences Laboratory
University of California
Berkeley CA 94720
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