Radio evidence for a shock wave reflected by a coronal hole S. Mancuso, A. Bemporad, F. Frassati, D. Barghini, S. Giordano, D. Telloni and C. Taricco A&A, 651 (2021) L14 Published online: 28 July 2021 DOI: 10.1051/0004-6361/202141387