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X-ray and EUV variability and impact during solar minimum: A modeling perspective

Authors

Pettit,  Joshua
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Garcia-Sage,  Katherine
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chamberlin,  Phillip
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang,  Jack
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bell,  Jared
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yue,  Jia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chou,  Min-Yang
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rowland,  Douglas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kuznetsova,  Maria
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Pettit, J., Garcia-Sage, K., Chamberlin, P., Wang, J., Bell, J., Yue, J., Chou, M.-Y., Rowland, D., Kuznetsova, M. (2023): X-ray and EUV variability and impact during solar minimum: A modeling perspective, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2460


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018293
Abstract
Extensive work over the past decades has been focused on high-energy photon impacts during short-timescale events such as solar flares, which occur frequently during solar maximum and its declining phase. The longer timescale impacts of solar irradiance from high-energy photons (x-ray and EUV) on the ionosphere and thermosphere, especially during quiet times such as solar minimum, have been largely ignored. This work investigates a period during solar minimum using state-of-the-art modeling simulations from the Global Ionosphere/Thermosphere Model (GITM) and the Whole Atmosphere Community Climate Model eXtended (WACCMX). For short wavelength forcing, we use the Flare Irradiance Spectral Model version 2 (FISM2), which captures variations at high energies much better than proxies such as F10.7, which is commonly used in modeling studies. Four simulations are performed: two for each model. The first two simulations use the traditional F10.7 radio flux as input for solar irradiance. The second set of simulations incorporate FISM2 at 5-minute temporal resolution using 59 wavelength bins for GITM and 23 wavelength bins for WACCMX. Comparisons are made between the FISM2-driven and F10.7-driven simulations to reveal the importance of including high-resolution solar irradiance at short wavelengths during solar minimum on the simulated upper atmospheric neutral and ion chemistry and dynamics. We select the 2009 timeframe for our studies, which was a remarkably quiet period during solar minimum of solar cycle 24. We validate simulated fields against available satellite observations made by CHAMP and SABER.