European Space Agency

Royal Belgian Institute for Aeronomy

G.04 - (OLD) How to install the IRI model?

Answer

The IRI model is included in the library since version 1.06.

The International Reference Ionosphere (IRI) is the empirical reference model of ionospheric densities and temperatures (electrons and ions) recommended for international use by the Committee on Space Research (COSPAR) and the International Union of Radio Science (URSI). It was established in a world-wide collaboration starting in the late sixties. IRI is up-dated bi-yearly during special IRI workshops to incorporate newly available measurements. IRI is based on all the important ionospheric data sources including ground-based (ionosonde, absorption, incoherent scatter) and spacecraft (Alouette, ISIS, AE, AEROS, DE, rockets) measurements. IRI provides monthly mean values for magnetically quiet conditions at non-auroral latitudes in the altitude range 50km to 2000km.

The IRI-90 package may be retrieved from the IRI site https://irimodel.org/. It includes the Fortran subroutines, data files with the model coefficients and documentation files. The UNILIB package make use of the IRIS12 subroutine which may be found in the directory where the data files are also archived.

When the IRI-90 model is not needed, a dummy subroutine IRIS12 may be written to avoid warnings during the link phase.

 LOGICAL*4      jf(12)
 INTEGER*4      jmag, mmdd, dhour
 REAL*4         alati, along, rz12, heibeg, heiend, heistp
 REAL*4         outf(11,50), oarr(30)

 CALL IRIS12 (jf, jmag, alati, along, rz12, mmdd, dhour,
&             heibeg, heiend, heistp, outf, oarr)

The UNILIB code calls the IRI-90 model with the declarations given above. Unfortunately, the original subroutine IRIS12 does not include explicit declarations of the arguments and thus the size of these arguments depends on the platform and compiler used. Therefore, the definition of the IRIS12 arguments should be probably adapted. This modification can be made by inserting, in each subroutine and function of the files iris12.for and irif12.for, the following lines:

IMPLICIT REAL*4    ( A-H,O-Z)
IMPLICIT INTEGER*4 (   I-N  )

and by changing the declaration of jf in the subroutine IRIS12. Dependencies The different subroutines, functions and common blocks used by the subroutine IRIS12 are listed in the table below

Common Blocks

ARGEXP	BLO10	BLOCK1
BLOCK2	BLOCK3	BLOCK4
BLOCK5	BLOCK6	BLOCK7
BLOCK8	BLOTE	BLOTN
CONST

Subroutines

CIRA86	F2OUT	FIELDG
GGM	INILAY	IONCOM
KOEFP1	KOEFP2	KOEFP3
LNGLSN	LSKNM	MODA
RDHHE	REGFA1	ROGUL
SOCO	SPHARM	SUFE
TAL	TEBA	VALGUL

Functions

B0POL	D1LAY	D2LAY
DXE1N	EPLA	ELTE
EPST	EPSTEP	EPTR
FOEEDI	FOF1ED	GAMMA1
HMF2ED	HPOL	RDNO
RLAY	RPID	TEDE
TEDER	TI	XE
XE1	XE2	XE2TO5
XE3	XE4	XE5
XE6	XEN	XMDED

Illustration

None

See Also

• uc150, atmospheric model description

• UA610(), select an atmospheric, ionospheric and/or plasmaspheric model

• EXT635(), IRI-90

• IRI Model

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UNILIB/tags/v3.02