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Extended radio emission associated with a breakout eruption from the back side of the Sun | | D. E. Morosan
; E. Palmerio
; B. J. Lynch
; E. K. J. Kilpua
; | | Date: |
12 Dec 2019 | | Abstract: | Context. Coronal mass ejections (CMEs) on the Sun are the largest explosions
in the Solar System that can drive powerful plasma shocks. The eruptions,
shocks, and other processes associated to CMEs are efficient particle
accelerators and the accelerated electrons in particular can produce radio
bursts through the plasma emission mechanism. Aims. Coronal mass ejections and
associated radio bursts have been well studied in cases where the CME
originates close to the solar limb or within the frontside disc. Here, we study
the radio emission associated with a CME eruption on the back side of the Sun
on 22 July 2012. Methods. Using radio imaging from the Nanc{c}ay
Radioheliograph, spectroscopic data from the Nanc{c}ay Decametric Array, and
extreme-ultraviolet observations from the Solar Dynamics Observatory and Solar
Terrestrial Relations Observatory spacecraft, we determine the nature of the
observed radio emission as well as the location and propagation of the CME.
Results. We show that the observed low-intensity radio emission corresponds to
a type II radio burst or a short-duration type IV radio burst associated with a
CME eruption due to breakout reconnection on the back side of the Sun, as
suggested by the pre-eruptive magnetic field configuration. The radio emission
consists of a large, extended structure, initially located ahead of the CME,
that corresponds to various electron acceleration locations. Conclusions. The
observations presented here are consistent with the breakout model of CME
eruptions. The extended radio emission coincides with the location of the
current sheet and quasi-separatrix boundary of the CME flux and the overlying
helmet streamer and also with that of a large shock expected to form ahead of
the CME in this configuration. | | Source: | arXiv, 1912.5995 | | Services: | Forum | Review | PDF | Favorites | |
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