Ocean-Ionosphere Disturbances Due To the 15 January 2022 Hunga-Tonga Hunga-Ha'apai Eruption
- Others:
- Institut de Physique du Globe de Paris (IPGP (UMR_7154)) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
- Observatoire de la Côte d'Azur (OCA) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Description
We investigate the oceanic and ionospheric response in New Caledonia-New Zealand and Chile-Argentina to the 15 January 2022 Hunga-Tonga volcanic eruption. For the first time, we highlight a reversed response in the oceans and in the ionosphere in terms of the amplitudes. The sea-surface fluctuations due to the passage of the atmospheric Lamb wave (i.e., air-sea wave) were not remarkable while the related ionospheric perturbation was considerable. Reversely, the eruption-induced tsunami ("regular" tsunami) caused major variations in sea-surface heights (∼1 m near the volcano and ∼2 m along the Chilean coastline), whereas the associated ionospheric perturbation was quite small. The observed large-amplitude ionospheric response due to Lamb waves propagation is difficult to explain, and the coupling between the Lamb wave and the ionosphere is not well-understood yet. For the first time, we estimate the delay between the Lamb waves and their signatures in the ionosphere to be ∼12-20 min.
Abstract
International audience
Additional details
- URL
- https://insu.hal.science/insu-04155723
- URN
- urn:oai:HAL:insu-04155723v1
- Origin repository
- UNICA