Authors
Brian J Harding, Yen-Jung Wu, Patrick Alken, Yosuke Yamazaki, Colin Charles Triplett, Thomas J Immel, Lilias Claire Gasque, Stephen B Mende, Chao Xiong
Publication date
2022/12
Journal
AGU Fall Meeting Abstracts
Volume
2022
Pages
SA35A-02
Description
The eruption of the Hunga Tonga-Hunga Ha'apai volcano on 15 January 2022 triggered atmospheric waves at all altitudes. The NASA Ionospheric Connection Explorer (ICON) and ESA Swarm satellites were well placed to observe its impact on the ionospheric wind dynamo. Here we focus on the far-field volcanogenic disturbance, after~ 10 hr and~ 10,000 km of wave propagation. When the wave entered the dayside, Swarm A observed an eastward and then westward equatorial electrojet (EEJ) on two consecutive orbits, each with magnitudes exceeding the 99.9 th percentile of typically observed values. ICON simultaneously observed the neutral wind (90–300 km altitude) at approximately the same distance from Tonga. The observed neutral winds were also extreme (> 99.9 th percentile at some altitudes). The covariation of EEJ and winds is consistent with recent theoretical and observational results, indicating …
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