Virtual Ionosphere, Thermosphere, Mesosphere Observatory (VITMO)
International Reference Ionosphere - IRI-2016

This page enables the computation and plotting of IRI parameters: electron and ion (O+, H+, He+, O2+, NO+) densities, total electron content, electron, ion and neutral (NRL-MSIS-2002) temperatures, equatorial vertical ion drift and others.

IRI homepage

* Select Date and Time
Year(1958-2018): Month: Day(1-31):
Note:If date is outside the Ap index range (1958-2016/09/30), then STORM model will be turned off.
Time Time (0. - 24.0 in decimal hours):
* Select Coordinates
Coord. Type Latitude(-90. - 90. deg.): Longitude(0. - 360. deg.)
Height (km, from 60. to 2000.):
*Select profile type and range:
Start Stop Stepsize

Optional Input:
Sunspot number, R12 (0. - 400.) Ionospheric index, IG12 (-50. - 400.)
F10.7 radio flux, daily (0. - 400.) F10.7 radio flux, 81-day (0. - 400.)

Electron content: Upper boundary (50. - 2000. km)

Ne Topside        Ne F-peak        F-peak storm model F-peak height       

Bottomside Thickness        F1 occurrence probability:

Auroral boundaries E-peak auroral storm model        D-region model

Te Topside        Ion Composition

Note: User may specify the following 5 parameters only for Profile type 'Height':
F2 peak density (NmF2) (10.3 - 10.8cm-3) or F2 plasma frequency (foF2) (2.-14. MHz):
F2 peak height (hmF2) (100. - 1000. km) or Propagation factor M(3000)F2 (1.5 - 4.):
E peak density (NmE) (20. - 10.8cm-3) or E plasma frequency (foE) (0.1-14. MHz)
E peak height (hmE) (70.-200. km): Bottomside thickness (B0) (50.-500. km):

*Select output form:

List model data
Create model data file in ASCII format for downloading
Plot model data 
      Note 1: The first selected parameter below always will be along the X-axis, the other selections will be along Y-axis.
              (e.g. if you want a Height profile, you may specify Height as the first parameter in the listing below.)     
      Note 2: User may get scatter plot if he specifies any two parameters below and changes the "connect type"  
              in the "Advanced plot selections" to "show points only"   

* Select desired output parameters
Independent Variables
Day of month
Day of year
Hour of day, UT/LT
      (depending on user's choice above)
Solar zenith angle, degree
Height, km
Geographic/Geomagnetic Latitude, deg.
      (depending on user's choice above)
Geographic/Geomagnetic Longitude, deg.
      (depending on user's choice above)
CGM Latitude, deg.
CGM Longitude, deg.
Magnetic inclination (DIP), degree
Modified dip latitude, degree
Declination, degree
InvDip, degree
Dip latitude, degree
MLT, hour

IRI Model Parameters
Electron_density (Ne), m-3
Ratio of Ne and F2 peak density(Ne/NmF2)>
Neutral Temperature Tn, K
Ion Temperature Ti, K
Electron Temperature, Te, K
Atomic Oxygen ions (O+), percentage
Atomic Hydrogen (H+),ions, percentage
Atomic Helium (He+), ions, percentage
Molecular Oxigen (O2+) ions, percentage
Nitric Oxide ions (NO+), percentage
Cluster ions, percentage
Atomic Nitrogen (N+) ions, percentage
Total Electron Content (TEC), 1016 m-2
TEC top, percentage
Height of F2 peak (hmF2), km
Height of F1 peak (hmF1), km
Height of E peak (hmE), km
Height of D peak (hmD), km
Density of F2 peak (NmF2), m-3
Density of F1 peak (NmF1), m-3
Density of E peak (NmE), m-3
Density of D peak (NmD), m-3

Propagation factor M(3000)F2
Bottomside thickness (B0), km
Bottomside shape (B1)
E-valley width, km
E-valley depth (Nmin/NmE)
F2 plasma frequency (foF2), MHz
F1 plasma frequency (foF1), MHz
E plasma frequency (foE), MHz
D plasma frequency (foD), MHz
Equatorial vertical ion drift, m/s
Ratio of foF2 storm to foF2 quiet
F1 probability
CGM lat of auroral oval boundary
Ratio foE storm to foE quiet
Spread-F probability
Indices used by the model
12-month running mean of sunspot number (Rz12)
Ionospheric Index IG12
Daily Solar Radio Flux F107D
81-day Solar Radio Flux F107_81D

Advanced plot selections (optional)
Connect Type: Character size(0.5-2.0)
Plot Symbol: Symbol Size(0.1-4.0):
Y-axis Scale: X-axis Scale:
Image size (pixels):X: Y:

Send questions about this model to Dr. Dieter Bilitza, E-mail:
Page Curator: Dr. Natalia Papitashvili, E-mail:,
Mail Code 672, NASA/Goddard Space Flight Center, Greenbelt, MD 20771

NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility