@article{LOPEZ-PUERTAS05_JGR_OB, author = "M. L{\'o}pez-Puertas and B. Funke and S. Gil-L{\'o}pez and T. von Clarmann and G. P. Stiller and M. H{\"o}pfner and S. Kellmann and H. Fischer and C. H. Jackman", title = "Observation of {NO}$_x$ Enhancement and Ozone Depletion in the Northern and Southern Hemispheres after the {O}ctober--{N}ovember 2003 Solar Proton Events", journal= "J. Geophys. Res.", volume = "110", number = "A9", eid = "A09S43", doi = " 10.1029/2005JA011050", year = "2005" }