TY JOUR TI Influence of January 2009 stratospheric warming on HF radio wave propagation in the low-latitude ionosphere KW sudden stratospheric warming KW HF radio communication KW radio signal attenuation KW equatorial ionization anomaly KW 3D modeling JO Solnechno-Zemnaya Fizika AU Kotova, D.S. AU Klimenko, M.V. AU Klimenko, V.V. AU Zakharov, V.E. AU Bessarab, F.S. AU Korenkov, Y.N. PY 2016 IS 2 PB INFRA-M Academic Publishing LLC.