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International Reference Ionosphere - IRI-2012
International Reference Ionosphere - IRI-2012

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 (CIRA-86) temperatures, equatorial vertical ion drift and others.

Go to the IRI description

* Select Date and Time
Note:If date is outside the Ap index range (1958/02/14-2021/7/11),then STORM model will be turned off.
Month: Day(1-31):
Time Hour of day (e.g. 1.5):
* Select Coordinates
Coordinates Type
Latitude(deg.,from -90. to 90.): Longitude(deg.,from 0. to 360.)
Height (km, from 60. to 2000.):
* Select a Profile type and its parameters:
Start Stop Stepsize

Optional Input:
Sunspot number, Rz12 (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 (km., from 50. - 2000. )
Ne Topside F peak model foF2 Storm model
Bottomside Thickness F1 occurrence probability:
Auroral Boundary foE auroral storm model Ne D-Region
Te Topside Ion Composition
Note: User may specify the following four parameters only for Profile type 'Height':
F2 peak density (NmF2), cm-3 (10.3 - 10.8) or F2 plasma frequency (foF2), MHz (2.-14.):
F2 peak height (hmF2), km (100. - 1000.) or Propagation factor M(3000)F2 (1.5 - 4.):
E peak density (NmE), cm-3 (20.- 10.8) or E plasma frequency (foE), MHz (0.1-14.):
E peak height (hmE), km (70. - 200.):
*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, degree
CGM Longitude, degree
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 Oxygen (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 auroal bounday
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
3-hour AP
daily AP
3-hour KP

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:

NASA Official: Masha Kuznetsova, Head of the Community Coordinated Modeling Center
Original web interface for this model and similar VITMO models has been designed by Dr. Natalia Papitashvili (Space Physics Data Facility) and maintained by Lutz Rastaetter, CCMC.

National Aeronautics and Space Administration Air Force Materiel Command Air Force Office of Scientific Research Air Force Research Laboratory Air Force Weather Agency NOAA Space Environment Center National Science Foundation Office of Naval Research

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