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Emission of Type II Radio Bursts – Single-Beam Versus Two-Beam Scenario

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Abstract

The foreshock region of a CME shock front, where shock accelerated electrons form a beam population in the otherwise quiescent plasma is generally assumed to be the source region of type II radio bursts. Nonlinear wave interaction of electrostatic waves excited by the beamed electrons are the prime candidates for the radio waves’ emission.

To address the question whether a single, or two counterpropagating beam populations are a requirement for this process, we have conducted 2.5D particle-in-cell simulations using the fully relativistic ACRONYM code.

Results show indications of three-wave interaction leading to electromagnetic emission at the fundamental and harmonic frequency for the two-beam case. For the single-beam case, no such signatures were detectable.

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Acknowledgements

The authors would like the Jülich Supercomputing Centre and the CSC Helsinki for their grants of computing time. UG and PK acknowledge financial support by the Elite Network of Bavaria. FS acknowledges support by the Deutsche Forschungsgemeinschaft, Grand SP1124-1. This work has been supported by the European Framework Programme 7 Grant Agreement SEPServer – 262773

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Correspondence to U. Ganse.

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Advances in European Solar Physics

Guest Editors: Valery M. Nakariakov, Manolis K. Georgoulis, and Stefaan Poedts

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Ganse, U., Kilian, P., Vainio, R. et al. Emission of Type II Radio Bursts – Single-Beam Versus Two-Beam Scenario. Sol Phys 280, 551–560 (2012). https://doi.org/10.1007/s11207-012-0077-7

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Keywords

  • Radio bursts
  • Type II
  • Radio bursts, theory
  • Plasma physics