Oscillation of solar radio emission at coronal acoustic cut-off frequency O. S. Pylaev, T. V. Zaqarashvili, A. I. Brazhenko, V. N. Melnik, A. Hanslmeier and M. Panchenko A&A, 601 (2017) A42 Published online: 26 April 2017 DOI: 10.1051/0004-6361/201629218