@article{JACKMAN11_ACP,
    author = "C. H. Jackman and D. R. Marsh and F. M. Vitt and R. G. Roble and
              C. E. Randall and P. F. Bernath and B. Funke and
              M. L{\'o}pez-Puertas and S. Versick and G. P. Stiller and
              A. J. Tylka and E. L. Fleming",
    title  = "Northern {H}emisphere atmospheric influence of the solar proton
              events and ground level enhancement in {J}anuary 2005",
    journal= "Atmos. Chem. Phys.",
    volume = "11",
    pages  = "6153-6166",
    year   = "2011"   }