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QEUV vs. Other EUV Proxies: A Re-Evaluation of Solar EUV Proxies for Thermospheric and Space Weather Investigations
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DOI：10.1029/2025SW004837.png)
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Abstract
En 中文
F10.7, Mg II, and F30 are widely used proxies for variability in solar Extreme UltraViolet (EUV, 5–120 nm) irradiance. An alternative proxy for solar EUV variability is QEUV, an indirect measure of total solar EUV irradiance, retrieved from observations of Earth's Far UltraViolet (FUV, 120–300 nm) airglow and from empirically modeled solar EUV spectra. Daily QEUV derived from FUV airglow is available from the Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics (TIMED) Global Ultraviolet Imager (GUVI) and Global-scale Observations of the Limb and Disk (GOLD) missions, as is QEUV from empirical solar EUV spectrum. Spectral measurements from GOLD are also used to retrieve lower-middle thermospheric temperature, termed as Tdisk. The availability of GOLD Tdisk and QEUV provides a new opportunity to reassess the effectiveness of various solar EUV proxies for thermospheric use. This investigation showed that QEUV has the best correlation with GOLD Tdisk compared to all the other EUV proxies. Therefore, it can be used as an alternate proxy for total solar EUV variability, on day-to-day to solar cycle time scales.
Keywords:
solar EUV irradiance
thermospheric temperature
QEUV as solar forcing
best EUV proxy
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