2019/02/18 by Diana E. Morosan, Eoin P. Carley, Laura A. Hayes +8 · 2 citations
Physics and Astronomy · #Corona (planetary geology) #Coronal mass ejection #Dust and Plasma Wave Phenomena #Flare #Heliosphere #Ionosphere and magnetosphere dynamics #LOFAR #Nanoflares #Particle acceleration #Shock (circulatory) #Solar and Space Plasma Dynamics #Solar flare #Solar physics #astro-ph.SR #physics.space-ph
paper · pdf · doi:10.1038/s41550-019-0689-z
published as Nature Astronomy 3, 452-461 (2019) · 31 pages, 6 figures
openalex publication_date 2019/02/18 · openalex created_date 2019/03/02 · arxiv created 2019/08/30 · arxiv updated 2019/09/02 · openalex updated_date 2026/08/05
The Sun is an active star that can launch large eruptions of magnetised plasma into the heliosphere, called coronal mass ejections (CMEs). 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 CMEs, shocks and particle acceleration is not well understood, partly due to the lack of radio imaging at low frequencies during the onset of shock-producing CMEs. Here, we report multi-instrument radio, white-light and ultraviolet imaging of the second largest flare in Solar Cycle 24 (2008-present) and its associated fast CME (3038+/-288 km/s). 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 the expanding CME. These observations support theories of non-uniform, rippled shock fronts driven by an expanding CME in the solar corona.