Fig. 8From: Ionospheric signatures of repeated passages of atmospheric waves by the 2022 Jan. 15 Hunga Tonga-Hunga Ha’apai eruption detected by QZSS-TEC observations in JapanComparison of the pressure anomaly (blue) and VTEC (black) obtained using the geostationary satellite J07, on Jan. 15 around the first passage of LW. Positions of GNSS stations (red circles), their SIPs (pink circles), and barometers near SIPs (black triangles) are given in an inset map together with labels a–d. SIPs and corresponding GNSS stations are tied with red dashed lines. Two TEC peaks are evident for a and d (blue and red arrows), but only the first peak (red arrow) is clear in b and c. Vertical dashed lines are drawn for 10, 11, 12, 13 UT to facilitate the comparison of arrival timesBack to article page