Finding the Best Proxies for the Solar UV Flux
Résumé
Solar UV emissions have a profound impact on the upper terrestrial atmosphere but their continuous and long-term monitoring is a major instrumental challenge. For that reason, solar proxies are used to reproduce the solar spectral variability. Finding the best proxies for specific spectral bands, however, remains an ongoing problem. Using several years of observations and a multiscale statistical approach, we test the performance of 8 proxies for the UV. In addition to this, we also include the expected response of the radiometers from LYRA/PROBA2 and PREMOS/PICARD. The relevance of these different proxies is evaluated on different time-scales using a novel graphical representation that allows all quantities to be compared simultaneously. This representation reveals which spectral bands are most difficult to reconstruct and what new proxies are needed. The best candidates for different spectral bands are given.