• Bilitza, D.International Reference Ionosphere 1990, URSI/COSPAR, NSSDC/WDC-A-R&S 90-22, 1990
  • Hajj, G. A.L. J. Romans, Ionospheric electron density profiles obtained with GPS: Results from the GPS/MET experiment, Radio Sci., 33, 1, 175190, 1998
  • Hajj, G. A.R. Ibanez-MeierE. R. KursinskiL. J. Romans, Imaging the ionosphere with Global Positioning System, Int. J. Imaging Syst. Technol., 5, 174184, 1994
  • Hardy, K. R.G. A. HajjE. R. KursinskiR. Ibanez-Meier, Accuracies of atmospheric profiles obtained from GPS occultations, Proceedings of the ION GPS-93 Conference, 15451556, 1993
  • Hernández-Pajares, M.J. M. JuanJ. Sanz, New approaches in global ionospheric determination using ground GPS data, J. Atmos. Sol. Terr. Phys., 61, 12371247, 1999
  • Hernández-Pajares, M.J. M. JuanJ. SanzJ. G. Solé, Global observation of the ionospheric electronic response to solar events using ground and LEO GPS data, J. Geophys. Res., 103, A9, 2078920796, 1998
  • Leitinger, R.H. P. LadreiterG. Kirchengast, Ionosphere tomography with data from satellite reception of GNSS signals and ground reception of NNSS signals, Radio Sci., 32, 4, 16571669, 1997
  • Schreiner, W. S.S. V. SokolovskiyC. RockenD. C. Hunt, Analysis and validation of GPSMET radio occultation data in the ionosphere, Radio Sci., 34, 949966, 1999
  • Ware, R. H.M. L. ExnerB. M. HermanY-H. KuoT. K. MeehanC. Rocken, GPS/MET Preliminary Report, operated by the UCAR and sponsored by the NSF, the FAA and the NOAA, July 1995