Max Millennium/Whole Sun Month Observations of a Sigmoid Region (AR 8668)

Details Max Millennium/Whole Sun Month Observations of a Sigmoid Region (AR 8668) Max Millennium/Whole Sun Month Observations of a Sigmoid Region (AR 8668)

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0236z&link_type=abstract

American Astronomical Society, SPD Meeting #31, #02.36; Bulletin of the American Astronomical Society, Vol. 32, p.817

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We report on observations of a sigmoidal region AR 8668 obtained during the Whole Sun Month #3 campaign and Max Millennium Coordinated Observing Program #2. The observations pertain to the period 1999 August 16-17 during which several GOES B and C class flares occurred in AR 8668. Near simultaneous observations were obtained by SOHO (EIT 195 Angstroms/ and MDI full-disk magnetograms), TRACE 171 Angstroms/, Yohkoh SXT, Big Bear (Hα ), and Mees (IVM vector magnetograms). The multi-wavelength nature of these data, combined with their overlapping spatial and temporal coverages, provide a unique opportunity to study the magnetic topology and flaring evolution of twisted flux structures associated with sigmoids. An objective of this study is to co-align images and magnetograms obtained before and during the observed flares, and compare the results with inferences from the topological model of Titov and Demoulin, A&A 351, 707 (1999). We will present examples of these coalignments and identify sites of magnetic energy release that are associated with topological features (e.g. separatrices) predicted by this model.

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