I will describe results from a large-scale, and still growing, spectroscopic survey of multi-year ultraviolet broad absorption line (BAL) variability in ~ 2100 quasars. This survey is primarily based on spectra from the ongoing Sloan Digital Sky Survey (SDSS) and is about two orders of magnitude larger than past comparable surveys – it is helping to transform the field of multi-year BAL variability studies into one that supplies robust statistical constraints that can effectively guide models of quasar winds and their feedback. Additional multiwavelength observations (primarily in the X-ray band) have been obtained to complement the SDSS spectra when important. This large-scale BAL variability survey allows novel studies of, e.g., disappearing and emerging BALs, coordinated BAL-trough variations, BAL acceleration/deceleration, BAL vs. emission-line variability, unusually stable BALs, and redshifted BAL profile variability. I will present some of the main survey results along with resulting open questions for discussion.
// by Adi