"Flux values" refers to the rate at which something changes or flows. It represents the measurements or quantities of movement, such as the amount of flow of a liquid or the rate of change of variables in a specific context. Full definition
This plot shows 3 - days of 5 - minute solar x-ray flux values. (wanliss.com)
Using all available geologic, tectonic and geothermal heat flux data for Greenland — along with geothermal heat flux data from around the globe — the team deployed a machine learning approach that predicts geothermal heat flux values under the ice sheet throughout Greenland based on 22 geologic variables such as bedrock topography, crustal thickness, magnetic anomalies, rock types and proximity to features like trenches, ridges, young rifts, volcanoes and hot spots. (sciencedaily.com)
The «Quiet Sun» has the average Flux values at ~ 85 [lowest value is ~ 67]; this is a little short of 250 during a Sunspot peak. (wattsupwiththat.com)