Langmuir waves associated with magnetic holes in the solar wind J. J. Boldú, D. B. Graham, M. Morooka, M. André, Yu. V. Khotyaintsev, T. Karlsson, J. Souček, D. Píša and M. Maksimovic A&A, 674 (2023) A220 Published online: 27 June 2023 DOI: 10.1051/0004-6361/202346100