1 / 10

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 on April 2 2001, X20 flare. the radio emission lanes, which is very rare Model

huslu
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related