Dynamically controlled ozone decline in the tropical mid-stratosphere observed by SCIAMACHY
Data sets
QBO equatorial winds at 10 and 30 hPa http://www.geo.fu-berlin.de/en/met/ag/strat/produkte/qbo/index.html
Anomalies of the Nino 3.4 index http://www.cpc.ncep.noaa.gov/data/indices/
Bremen Composite Mg-II Index (10.1051/swsc/2014001) http://www.iup.uni-bremen.de/UVSAT/Datasets/mgii