@article{Richards2009a, author = "P. G. Richards and M. J. Nicolls and C. J. Heinselman and J. J. Sojka and J. M. Holt and R. R. Meier", title = "Measured and modeled ionospheric densities, temperatures, and winds during the international polar year", year = 2009 , journal = "J. Geophys. Res.", volume = 114, keywords = "amisr, pfisr", doi = "10.1029/2009JA014625" }