Scientists at the University of Iowa reported the first detection of cosmic rays from electrons, which were accelerated by shock waves generated by coronal mass ejections into the Sun. The discovery of a previously unknown phenomenon was made using instruments aboard the Voyager-1 and Voyager-2 probes that entered interstellar space. This is reported in an article published in the Astronomical Journal.
It turned out that the electrons fly almost at the speed of light, which is about 670 times faster than the shock waves that originally accelerated them. A few days later, following the electron bursts, the instruments recorded plasma wave oscillations caused by electrons of lower energies. Finally, a month later, the shock wave itself reached the space probes.
The shock waves came from coronal mass ejections of hot gas and energy, which moved from the Sun at a speed of over one million kilometers per hour. However, even at these speeds, shock waves would take more than a year to reach the Voyagers, who are about 20 billion kilometers away.