International Reference Ionosphere - IRI-2007
International Reference Ionosphere - IRI-2007

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 (1960/02/14-2023/6/2),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.)
Electron content: Upper boundary (km., from 50. - 2000. )
Ne Topside F peak model foF2 Storm model
Bottomside Thickness F1 occurrence probability: Ne D-Region
Te Topside Ion Composition
Note: User may specify the following two 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.):
*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)
Dip, degree
Modified dip latitude, degree
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
Total Electron Content (TEC), 1016 m-2
TEC top, percentage
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
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
Spread F probability
Ratio of foF2 storm to foF2 quiet
F1 probability 1979
F1 probability 1995 incl. L-condition
F1 probability 1995
Indices used by the model
12-month running mean of sunspot number (Rz12)
Ionospheric Index IG12
Daily Solar Radio Flux F107D

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: Web interface for this model has been designed by Dr. Natalia Papitashvili.