Stratospheric balloon observations of infrasound waves from the January 15 2022 Hunga eruption, Tonga

Aurélien Podglajen (1) , Alexis Le Pichon (2) , Raphaël Garcia (3) , Solène Gérier (3) , Christophe Millet (2) , Kristopher Bedka (4) , Konstantin Khlopenkov (5) , Sergey Khaykin (6) , Albert Hertzog (1)

1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
2 DAM/DIF - DAM Île-de-France
3 ISAE-SUPAERO - Institut Supérieur de l'Aéronautique et de l'Espace
4 LaRC - NASA Langley Research Center [Hampton]
5 SSAI - Science Systems and Applications, Inc. [Hampton]
6 STRATO - LATMOS

The 15 January 2022 eruption of the Hunga volcano (Tonga) generated a rich spectrum of waves, some of which achieved global propagation. Among numerous platforms monitoring the event, two stratospheric balloons flying over the tropical Pacific provided unique observations of infrasonic wave arrivals, detecting five complete revolutions. Combined with ground measurements from the infrasound network of the International Monitoring System, balloon-borne observations may provide additional constraint on the scenario of the eruption, as suggested by the correlation between bursts of acoustic wave emission and peaks of maximum volcanic plume top height. Balloon records also highlight previously unobserved long-range propagation of infrasound modes and their dispersion patterns. A comparison between ground- and balloon-based measurements emphasizes superior signal-to-noise ratios onboard the balloons and further demonstrates their potential for infrasound studies.

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]

Aurélien Podglajen, Alexis Le Pichon, Raphaël Garcia, Solène Gérier, Christophe Millet, et al.. Stratospheric balloon observations of infrasound waves from the January 15 2022 Hunga eruption, Tonga. Geophysical Research Letters, 2022, 49 (19), pp.e2022GL100833. ⟨10.1029/2022GL100833⟩. ⟨insu-03790705⟩