Online International Reference Ionosphere Extended to Plasmasphere (IRI-Plas) Model

SEZEN U., Gulyaeva T. L., ARIKAN F.

32nd General Assembly and Scientific Symposium of the International-Union-of-Radio-Science (URSI GASS), Montreal, Canada, 19 - 26 August 2017 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.23919/ursigass.2017.8105426
  • City: Montreal
  • Country: Canada
  • Hacettepe University Affiliated: Yes


International Reference Ionosphere (IRI) is the most commonly used climatic model of ionosphere. Recently developed IRI Extended to Plasmasphere (IRI-Plas) model extended the interest region of IRI to the GPS orbital height of 20,000 km. IRI-Plas can not only input F2 layer critical frequency, foF2, and maximum ionization height, hmF2, similar to IRI but also it can update and scale foF2 with the input of Total Electron Content (TEC). The topside electron density profile is scaled using input TEC value up to 20,000 km to include the variability in plasmaspheric region. IRI-Plas is presented in a FORTRAN code. IONOLAB group ( offers an user-friendly online version of IRI-Plas as a space weather service. Online IRI-Plas can run for multiple tasks with different inputs and an automatic GPS-TEC input option is offered to the user. The comparison of Online IRI-Plas with ionosonde profiles indicate that TEC input is highly useful in update of electron density profile to the current ionospheric state especially for geomagnetically disturbed days.