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Using TEC measurements from the dense network of GPS sites GEONET, we have\udobtained the first GPS-TEC image of the space structure of medium-scale\udtraveling wave packets (MS TWP) excited by the morning solar terminator\ud(ST). We found that ST-generated wave packets have duration of about 1–2 h\udand time shift of about 1.5–6 h after the morning ST appearance at\udan altitude of 300 km. The TWP wave front extends along the morning ST line\udwith the angular shift of about 20°. The time period and wave-length of\udST-generated wave packets are about 10–20 min and 200–300 km, respectively.\udThe velocity of the TWP phase front traveling is of about 300 m/s. The space\udimage of MS TWP manifests itself in pronounced anisotropy and high coherence\udover a long distance of about 2000 km

The first GPS-TEC imaging of the space structure of MS wave packets excited by the solar terminator