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Yuichi Otsuka

Editor, Geophysical Research Letters

Photo of STEVE over a map.
Posted inEditors' Highlights

Unusual Occurrence of STEVE: An Aurora-Like Glow

by Yuichi Otsuka 13 November 20248 November 2024

STEVE is a mysterious purple-white arc near the aurora, typically seen after space disturbances called substorms. A new study reveals a rare STEVE event without a substorm, prompting questions about its origin.

Satellite photo of Earth with a large shadow covering Antarctica.
Posted inEditors' Highlights

Solar Eclipses May Initiate Disturbances in Geospace

by Yuichi Otsuka 6 February 20245 February 2024

The statistical evidence from 21 years of data suggests that a solar eclipse may trigger a geomagnetic substorm, which is a disturbance in the Earth’s magnetosphere and ionosphere.

Graphs from the paper
Posted inEditors' Highlights

Modeling Whole Atmosphere Responses to the Hunga-Tonga Eruption

by Yuichi Otsuka 13 June 20238 June 2023

A high-resolution whole atmosphere simulation captures the strong, global responses up to the thermosphere and ionosphere following the Hunga-Tonga volcano eruption.

Graphs from the paper.
Posted inEditors' Highlights

Wind Shear Instabilities Emit Gravity Waves

by Yuichi Otsuka 27 April 202327 April 2023

A new study shows that atmospheric gravity waves can be generated by the Kelvin-Helmholtz instabilities in the wind shear layer.

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Decoding Crop Evapotranspiration

6 May 20256 May 2025
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