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Radio Diagnostics of Electron Acceleration Sites During the Eruption of a Flux Rope in the Solar Corona by Eoin Carley et al.*

28 Mar 2017, 12:04 UTC
Radio Diagnostics of Electron Acceleration Sites During the Eruption of a Flux Rope in the Solar Corona  by Eoin Carley et al.*
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Flares and coronal mass ejections (CMEs) are thought to result from magnetic energy release in the solar corona, often involving the destabilisation of a twisted magnetic structure known as a flux rope (Chen et al. 2011, Webb et al. 2012). This activity may be accompanied by the acceleration of electrons (Kahler 2007, Lin et al. 2011). However, there is ongoing debate on exactly where, when and how this particle acceleration occurs during flaring and eruption. Observing the locations of energetic electrons during an eruptive event may help confirm how the electrons are accelerated, how the eruption proceeds, and also help in identifying which models of solar eruptive activity are correct.
In this study, we examine an eruptive event from 2014-April-18 using the Atmospheric Imaging Assembley (AIA) and attempt to identify the sites of electron acceleration in association with the erupting flux rope using radio imaging from the Nancay Radioheliograph (NRH) combined with metric and decimetric radio spectrography. We show strong observational evidence of energised electrons produced from an eruptive mechanism which closely resembles a tether-cutting or flux cancelation model. This is followed by electron acceleration from reconnection above the erupting structure in the surrounding magnetic environment. Sites of electron acceleration ...

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