Activity: Talk or presentation types › Oral presentation
The Sun is an active star that produces the most powerful explosions in the solar system in the form of solar flares, often accompanied by coronal mass ejections (CMEs) that drive colisionless shocks in the corona. CME shocks are efficient particle accelerators and shock signatures associated with CMEs are often observed as solar radio bursts. However, the relationship between radio shock signatures on the Sun and the expansion of a CME is still not well understood due to previous limitations of low radio frequency imaging (<150 MHz) where the most dramatic acceleration is believed to occur. Here, we exploit a unique set of observations from the Low Frequency Array (LOFAR) of a X8.2-class solar flare on 10 September 2017 and its associated very fast CME (3000 km/s). In particular, we image for the first time a multitude of radio shock signatures called herringbones. Using multi-wavelength analysis, we provide convincing evidence for shock accelerated electrons at multiple locations on the expanding CME flank.