We have ground-based proxy data (like sunspot counts) dating back centuries, whereas satellite data only spans a few decades. Common Types of Ultraviolet Proxies
High-energy UV never reaches the ground, making "traditional" land-based sensors useless for monitoring the upper atmosphere. 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 We have ground-based proxy data (like sunspot counts)
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) The F10
Understanding the Ultraviolet Proxy: A Window into Solar Health and Atmospheric Impact
When UV radiation increases, it heats Earth’s thermosphere, causing it to expand. This increased density at high altitudes creates "drag" on Low Earth Orbit (LEO) satellites. Operators use UV proxies to predict when a satellite might lose altitude and require a maneuver to stay in orbit. Global Communications