edu.ucar.opensky::articles:43331 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T17:51:31.458863 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.net/ark:/85065/d7ww7p3f https://doi.org/10.26050/WDCC/OTHITACS_tiegcm https Related Dataset #1 The open time-series of the high-resolution ionosphere-thermosphere aeronomic climate simulation (OTHITACS) Unusual variation in nitric oxide radiative flux and neutral density over Hunga‐Tonga region caused by the volcanic eruption 2025-04-16T00:00:00Z publication https://n2t.net/ark:/85065/d7ww7p3f https://doi.org/10.1029/2025GL115083 Nailwal, D. author Sunil Krishna, M. V. author Lu, X. author Wu, Haonan author Kumar, A. author Ranjan, A. K. author UCAR/NCAR - Library publisher Large&#8208;scale volcanic eruptions, such as the Hunga&#8208;Tonga volcanic eruption that occurred in 2022, can impact the atmospheric structure and dynamics in a highly complex way. The response of Nitric oxide (NO) radiative emissions to the lower atmospheric forcing caused by the Hunga&#8208;Tonga eruption has been examined in this study using Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) measurements. On 15 January, neutral densities and NOIRF (Nitric Oxide Infrared Radiative Flux) were found to be depleted over the Hunga&#8208;Tonga following the volcanic eruption, as observed by Swarm and SABER. Subsequently, the following day, a significant and highly localized enhancement in NOIRF is observed. Using TIEGCM (Thermosphere Ionosphere Electrodynamics General Circulation Model) simulations with gravity wave input, it has been established that wave&#8208;induced lower atmospheric forcing is primarily responsible for the compositional and temperature changes. These changes influence the vibrational excitation mechanism of NO, resulting in the observed emission pattern during the Hunga&#8208;Tonga event. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication <span style="font-family:Arial;font-size:10pt;font-style:normal;" data-sheets-root="1">Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.</span> None eng geoscientificInformation