TY JOUR TI Observation at radio frequencies of the hydroxyl (OH) absorption line in filaments and prominences above active regions of the Sun KW Sun KW coronal structures KW absorption lines KW hydroxyl JO Solnechno-Zemnaya Fizika AU Ovchinnikova, N.E. AU Bogod, V.M. AU Lebedev, M.K. PY 2024 IS 10 PB INFRA-M Academic Publishing LLC.