Fig. 7From: A confirmation of vertical acoustic resonance and field-aligned current generation just after the 2022 Hunga Tonga Hunga Ha’apai volcanic eruptionA comparison of power spectral density (PSD) of geomagnetic variation and GPS-TEC variation observed in Hawaii (upper panels) and those observed in Samoa (lower panels). The data from 04:30 to 05:30 UT were used to obtain the PSD by the MEM method with lag = 20 minBack to article page