34th Solar Physics Division Meeting, June 2003
Session 16 Flares and Microflares II
Poster, Wednesday, June 18, 2003, 3:30-5:00pm, Mezzanine

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[16.10] Energy Build-up Process in Homologous Flares Observed in NOAA10314.

S. Morita (NASA Goddard Space Flight Center)

We present evidence of an energy build-up process of homologous flares in a newly emerged active region. In March 2003, about 40 flares occurred in the same active region NOAA10314 within 5 days (March 15 - March 19). This active region has dual bipolar magnetic configuration that emerged on March 13, and was continually growing through this period. We examined the development of the coronal structures in this area, paying attention to intersecting separatrix surfaces and their lines of intersection, which usually exist above this type of photospheric magnetic pattern. We found: (1) About 30 flares, with similar features (arcade shapes and/or diagonal structures), occurred in physically similar regions, in or near a vertical plane including one of the neutral lines in the photosphere. (2) We see structures resembling dual separatrix surfaces at both sides of flaring structures in EIT images before March 17. (3) Separating motions between positive and negative polarities of the eastern dipole of this active region are seen in a time series of MDI magnetograms. This suggests that this dipole area is a currently emerging flux region. (4) In TRACE images, we see frequently a lot of tiny brightenings and mass motions near the photosphere in the area outside of the flaring region. This area corresponds to the eastern dipole area in the item (3). Based on these observations, we present a possible model of an energy build-up process in flares. Acknowledgment: This research is supported by the National Research Council.


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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.