The paper presents results of studying total electron content (TEC) variations during the intense tropical cyclones occurred in late August-early October 2016 in the North-Western Pacific Ocean. An increase in the intensity of TEC variations within internal gravity waves periods is observed at stations located near the cyclone region. The most significant growth in the amplitude is registered for small- and medium-scale variations (2-50 min) mainly at the daytime. The intensity of variations with longer periods (up to 4 hours) changes only in the morning and evening local time hours, during the passage of the solar terminator. We assume the interaction of ionospheric disturbances generated by tropical cyclones and solar terminator passage. A possible mechanism for the interaction is briefly discussed
$^1$Institute of Solar-Terrestrial Physics SB RAS\
$^2$Faculty of Physics, M.V. Lomonosov Moscow State University.
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