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Bifurcation of Metric Type II Radio Emission in Giant Solar Flare

This study investigates the bifurcation of metric type II radio emission associated with a giant solar flare on April 2, 2001. The model replicates the observed bifurcation and suggests that the shock wave triggered magnetic reconnection in a current sheet, leading to the ejection of a plasmoid.

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Bifurcation of Metric Type II Radio Emission in Giant Solar Flare

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  1. 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

  2. Abstract • Bifurcation • 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

  3. bifurcation bifurcation type II burst NiCT/HiRAS

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

  5. CME roughly circular shape SOHO/LASCO

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

  7. Model • Radio bursts • 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

  8. CME fronts CME/Linear fit LASCO UVCS DPS

  9. Second shock second shock

  10. 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.

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