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Quasi-periodic acceleration of electrons by a plasmoid-driven shock in the solar atmosphere

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Title:Quasi-periodic acceleration of electrons by a plasmoid-driven shock in the solar atmosphere
Authors:Carley, Eoin P.
Long, David M.
Byrne, Jason P.
Zucca, Pietro
Bloomfield, D. Shaun
show 2 moreMcCauley, Joseph
Gallagher, Peter T.
show less
Date Issued:Oct 2013
Publisher:Nature Physics
Abstract: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 (Alfvén Mach number 2:4+0:7
-0:8) 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
quasi-perpendicular shocks are capable of producing quasi-periodic acceleration
of electrons, an effect consistent with a turbulent or rippled
plasma shock surface.
Appears in Collections: Institute for Astronomy Faculty & Researcher Works

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