TY JOUR TI Comparative analysis of responses of minimum frequency of ionogram reflections and mesosphere-lower thermosphere temperature to winter sudden stratospheric warmings KW minimum frequency of ionogram reflections KW temperature KW mesosphere-low thermosphere KW MLT KW sudden stratospheric warming KW correlation analysis JO Solnechno-Zemnaya Fizika AU Ratovsky, K.G. AU Medvedeva, I.V. PY 2026 IS 12 PB INFRA-M Academic Publishing LLC.