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Multiple Regions of Shock Accelerated Particles in the Solar Corona

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posted on 02.11.2018 by Peter Gallagher, Diana Morosan, Eoin Carley, Laura Hayes, Sophie Murray, Pietro Zucca, Richard Fallows, Joe McCauley, Emilia Kilpua, Gottfried Mann, Christian Vocks
Poster at European Space Weather Week, November 2018.

The Sun is an active star that can launch large eruptions of magnetised plasma into the heliosphere, called coronal mass ejections. These ejections can drive shocks that accelerate particles to high energies, often resulting in radio emission at low frequencies (<200 MHz). To date, the relationship between the expansion of coronal mass ejections, shocks and particle acceleration is not well understood, partially due to difficulties associated with radio imaging at low frequencies. Here, we report unique radio, whitelight and ultraviolet imaging of the second largest flare in the current solar cycle and associated very fast coronal mass ejection (~3000km/s). For the first time, we identify the location of a multitude of radio shock signatures, called herringbones, and find evidence for shock accelerated electron beams at multiple locations along an expanding coronal mass ejection, supporting theories of non-uniform, rippled shock fronts.

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Science Foundation Ireland, Irish Research Council

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