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Three-dimensional reconstruction of multiple particle acceleration regions during a coronal mass ejection | | D. E. Morosan
; E. Palmerio
; J. Pomoell
; R. Vainio
; M. Palmroth
; E. K. J. Kilpua
; | | Date: |
23 Jan 2020 | | Abstract: | Context. Some of the most prominent sources for particle acceleration in our
Solar System are large eruptions of magnetised plasma from the Sun called
coronal mass ejections (CMEs). These accelerated particles can generate radio
emission through various mechanisms. Aims. CMEs are often accompanied by a
variety of solar radio bursts with different shapes and characteristics in
dynamic spectra. Radio bursts directly associated with CMEs often show movement
in the direction of CME expansion. Here, we aim to determine the emission
mechanism of multiple moving radio bursts that accompanied a flare and CME that
took place on 14 June 2012. Methods. We used radio imaging from the Nancay
Radioheliograph, combined with observations from the Solar Dynamics Observatory
and Solar Terrestrial Relations Observatory spacecraft, to analyse these moving
radio bursts in order to determine their emission mechanism and
three-dimensional (3D) location with respect to the expanding CME. Results. In
using a 3D representation of the particle acceleration locations in relation to
the overlying coronal magnetic field and the CME propagation, for the first
time, we provide evidence that these moving radio bursts originate near the CME
flanks and some that are possible signatures of shock-accelerated electrons
following the fast CME expansion in the low corona. Conclusions. The moving
radio bursts, as well as other stationary bursts observed during the eruption,
occur simultaneously with a type IV continuum in dynamic spectra, which is not
usually associated with emission at the CME flanks. Our results show that
moving radio bursts that could traditionally be classified as moving type IVs
can represent shock signatures associated with CME flanks or plasma emission
inside the CME behind its flanks, which are closely related to the lateral
expansion of the CME in the low corona. | | Source: | arXiv, 2001.8473 | | Services: | Forum | Review | PDF | Favorites | |
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