A Collaborative National Center for Fusion & Plasma Research
April 8, 2015, 4:15pm to 5:30pm

MBG Auditorium

COLLOQUIUM: Type II Solar Radio Bursts: From Fundamental Plasma Physics to Space Weather Research

Professor Iver Cairns
University of Sydney - School of Physics

For over 60 years type II solar radio bursts have defied detailed quantitative explanation, despite their promise for predicting space weather at Earth and their status as the archetype for coherent radio emission stimulated by shocks. Type II bursts are widely accepted to be radio emission produced at the electron plasma frequency and/or twice that frequency upstream from shock waves (usually driven by coronal mass ejections [CMEs]) moving through the corona and solar wind: electrons reflected at the shock develop beam distribution functions, the electron beams drive Langmuir waves, and the Langmuir waves couple linearly and/or nonlinearly to produce the fundamental and harmonic radio emission. At the University of Sydney we have developed quantitative analytic descriptions for the detailed plasma physics of these steps. We have also constructed a state-of-the-art theoretical / simulational model for an arbitrary specified type II burst by combining the above kinetic emission theory with a 3D MHD simulation of the CME and associated shock through a realistic, data-driven, 3D model for the corona and solar wind. Here I demonstrate impressive quantitative agreement between the predicted and observed properties of both coronal and interplanetary type II bursts. These suggest that we are close to "solving the type II problem" and being able to use our simulations of type IIs for space weather prediction.

Colloquium Committee: 

The Princeton Plasma Physics Laboratory 2019-2020 Colloquium Committee is comprised of the following people. Please feel free to contact them by e-mail regarding any possible speakers or topics for future colloquia.

Carol Ann Austin, caustin@pppl.gov
Marc-Andre DeLooz, mdelooz@pppl.gov
Erik Gilson, egilson@pppl.gov
Jessica Ilagan, jilagan@pppl.gov
Igor Kaganovich, ikaganov@pppl.gov

  • Carol Ann Austin 609-243-2484

U.S. Department of Energy
Princeton Plasma Physics Laboratory is a U.S. Department of Energy national laboratory managed by Princeton University.

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