TRACE Observation of an Arcade Flare Showing Evidence Supporting Quadruple Magnetic Source Model for Arcade Flares

Details TRACE Observation of an Arcade Flare Showing Evidence Supporting Quadruple Magnetic Source Model for Arcade Flares TRACE Observation of an Arcade Flare Showing Evidence Supporting Quadruple Magnetic Source Model for Arcade Flares

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55..305u&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.1, pp.305-312

Astronomy and Astrophysics

Astronomy

4

Sun: Dark Filament, Sun: Flare, Sun: Magnetic Reconnection

Scientific paper

The result of analyses of an arcade flare on 1999 July 19, observed by the Satellite TRACE, is reported, and the significance of the following findings is stressed. It is clearly seen that four magnetic regions of alternating polarities [named A(+), B(-), C(+), and D(-) from the East in the flaring region] are involved in this arcade flare event in an essential way. The high structure covering the triangular region between A and the northern part of D disappears when the dark filament lying between B and C erupts. The X-ray arcade is formed only between B and C. The overlying structure connecting regions A and the northern part of D disappears and the entire region is involved in the flare. Low-lying loops connect the inner sources to the outer sources. The field lines from regions B to A and C to D are not much affected by the eruption of the dark filament, itself, but the loops near the upper surfaces of the closed loop regions are clearly seen to move toward each other (from both sides to the central line) as the arcade flare progresses between the inner pair, B and C; some of them appear to be converted into a flare arcade. The observed behavior can best be understood in terms of the quadruple magnetic source model advocated by one of the authors (YU). The long-conceived ``reclosing of once opened bipolar magnetic arcade'' models by the rising dark filament (called CSHKP model) find it difficult to explain this.

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