S. Mancuso and L. Abbo (2004, A&A, 415, L17) Okamoto Takenori

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S. Mancuso and L. Abbo (2004, A&A, 415, L17) Okamoto Takenori Bifurcation of the metric type II radio emission associated with the giant solar flare of April 2 2001 S. Mancuso and L. Abbo (2004, A&A, 415, L17) Okamoto Takenori

Abstract Bifurcation Model on April 2 2001, X20 flare. the radio emission lanes, which is very rare Model the interaction of a piston driven shock with a vertical current sheet the model replicates successfully the observed bifurcation the magnetic reconnection was triggered in the current sheet by the shock wave passage

bifurcation bifurcation type II burst NiCT/HiRAS

streamer axis and CME The axis of symmetry of the expanding bubble does not coincide with the streamer axis.

CME roughly circular shape SOHO/LASCO

Model The frequencies of the type II were emitted at the two intersections of the expanding shock surface with the streamer axis.

Model Radio bursts The shock wave passage selectively produced in the densest parts (along streamer axes) the strength of fast-mode shocks can be very much enhanced The shock wave passage triggers magnetic reconnection just above the AR the ejection of a supermagnetosonic plasmoid another shock

CME fronts CME/Linear fit LASCO UVCS DPS

Second shock second shock

Conclusions The bifurcation of the radio type II emission was produced by a curved fast shock surface intersecting a vertical current sheet above an AR. The shock wave may have triggered magnetic reconnection in the current sheet, causing the ejection of a second plasmoid. Redio emitting inward propagating shocks should occur more often. The emission of the positively drifting lanes fades quickly.