Phys.org December 12, 2022
Acoustic-gravity waves propagated by the eruption and tsunami caused global complex ionospheric disturbances. Researchers at the University of Washington studied the nature of the perturbations from Global Navigation Satellite System observables over the southwestern Pacific. After processing data from 818 ground stations, they detected supersonic acoustic waves, Lamb waves, and tsunamis, with filtered magnitudes between 1 and 7 Total Electron Content units. Phase arrivals appeared super positioned up to ∼1,000 km from HTHH and were distinct by ∼2,200 km. Within ∼2,200 km, signals had an initial low-frequency pulse that transitioned to higher frequencies. They found the presence of a faster perturbation generated 1 hr post-eruption which crossed the tsunami disturbance ∼3,000 km from HTHH, potentially contributed to premature land arrivals. The arrival of tsunami-generated disturbances coincided with deep-ocean observations…read more. Open Access TECHNICAL ARTICLEÂ
Map view of ionospheric disturbance arrivals over the southwestern Pacific for satellites G10 and G23…. Credit: Geophysical Research Letters, Volume49, Issue 20, 28 October 2022, e2022GL100145Â