Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh23a0349d&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH23A-0349
Mathematics
Logic
7519 Flares, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835)
Scientific paper
In order to improve the understanding of both flare initiation and evolution, we take advantage of powerful new topological methods and the high spatial resolution of RHESSI to examine where magnetic reconnection takes place in flare-producing solar active regions. We use the MPOLE (http://solar.physics.montana.edu/dana/mpole/) software to extrapolate the observed line of sight photospheric magnetic field into the corona. MPOLE is a suite of IDL programs that implements the Minimum Current Corona Model (Longcope 1996). Recently it has been improved to use a hierarchy of topological features (Beveridge 2006). The coronal extrapolation gives the location of topological features such as poles, nulls, separatricies, separators, and spine lines. For several flares well observed by RHESSI and MDI, we examine the locations of flare HXR emission in the context of these topological features. Two noteworthy relationships are found. First, when footpoints move, they move along spine lines. Second, when separators significantly change over the course of a flare, only those associated with the flare footpoints do so. In this poster, we present observations supporting the relationship between spine lines and footpoint tracks, demonstrate the importance of separator analysis in the study of flares, explore uncertainties in the MPOLE and RHESSI analyses, and survey possible interpretations of the reported results. This work is supported by NASA.
Canfield Rod
Des Jardins Angela
Fordyce Crystal
Longcope Dana
McLinden Emily
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