Fig. 14From: A confirmation of vertical acoustic resonance and field-aligned current generation just after the 2022 Hunga Tonga Hunga Ha’apai volcanic eruptionPressure variation at altitude 39.75 k or 119.25 km, …. In this case, sound speed Cs = 300 m/sec, fundamental wave period T = 265 s, and wave amplitudes for harmonics (n = 1, …,5) An, An = An−1/2 (A1 = 1.0), are assumedBack to article page