Journal
NATURE PHYSICS
Volume 9, Issue 12, Pages 811-816Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2767
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Funding
- Irish Research Council Embark Initiative
- European Commission [284461]
- SHINE [0962716]
- NASA [NNX08AJ07G, NNX13AG11G]
- Trinity College Dublin Innovation Academy Bursary
- ESA PRODEX
- Earl of Rosse
- NASA [99977, NNX13AG11G, NNX08AJ07G, 474668] Funding Source: Federal RePORTER
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Cosmic rays and solar energetic particles may be accelerated to relativistic energies by shock waves in astrophysical plasmas. On the Sun, shocks and particle acceleration are often associated with the eruption of magnetized plasmoids, called coronal mass ejections (CMEs). However, the physical relationship between CMEs and shock particle acceleration is not well understood. Here, we use extreme ultraviolet, radio and white-light imaging of a solar eruptive event on 22 September 2011 to show that a CME-induced shock (Alfven Mach number 2.4(-0.8)(+0.7)) was coincident with a coronal wave and an intense metric radio burst generated by intermittent acceleration of electrons to kinetic energies of 2-46 keV (0.1-0.4 c). Our observations show that plasmoid-driven quasiperpendicular shocks are capable of producing quasiperiodic acceleration of electrons, an effect consistent with a turbulent or rippled plasma shock surface.
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