TY JOUR TI Bright ultraviolet knots as possible sources of coherent microwave radiation KW Sun KW fine temporal structure KW UV bright knots KW microwave bursts KW coherent emission JO Solar-Terrestrial Physics AU Мешалкина, Н.С. AU Алтынцев, А.Т. PY 2023 IS 9 PB Институт солнечно-земной физики СО РАН