High-energy UV never reaches the ground, making "traditional" land-based sensors useless for monitoring the upper atmosphere.
Space-based EUV sensors lose calibration quickly due to high-energy exposure. ultraviolet proxy
The ionosphere—the layer of the atmosphere that reflects radio signals—is created by solar UV radiation stripping electrons from atoms. By monitoring proxies, telecommunications companies and GPS providers can predict signal disruptions caused by solar-induced ionospheric storms. Climate and Ozone Monitoring predict "space weather
As we move deeper into , the reliance on proxies is evolving. Modern machine learning models are now being trained to combine multiple proxies—integrating F10.7, Mg II, and solar imaging—to create "synthetic" UV measurements that are more accurate than any single instrument. Conclusion By monitoring proxies
Several different indicators are used depending on whether the goal is to track solar irradiance, predict "space weather," or monitor the ozone layer. 1. The F10.7 Index (Radio Flux)
UV radiation is the primary driver of ozone formation and destruction in the stratosphere. Using proxies allows climatologists to differentiate between human-caused ozone depletion and natural fluctuations driven by the solar cycle. The Future of UV Proxy Modeling