@article{Sojka2009b, author = "J. J. Sojka and M. J. Nicolls and C. J. Heinselman and J. D. Kelly", title = "The PFISR IPY observations of ionospheric climate and weather", year = 2009 , journal = "J. Atmos. Solar-Terr. Phys.", volume = 71, number = 6, pages = "771-785", keywords = "amisr, pfisr", doi = "10.1016/j.jastp.2009.01.001" }