8.2.2 Ionosphere

a. For the ionospheric environment, the International Reference Ionosphere 2007 (IRI-2007) [RN.9], shall be used.

b. Inputs to the IRI-2007 model, shall be:

1. choice of geographic or geomagnetic coordinates;

2. latitude;

3. longitude;

4. date;

5. local or universal time;

6. altitude (start and end of range and step size).

c. Other inputs shall be the default values for dates up to June 2008 or later periods if available in the input files that are provided with the model.

NOTE This means that Sunspot number Rz12, IG12 (see 6.1.2.3.2), F10.7 and a_p data are taken from default files.

d. For future dates not covered by the defaults files, for F10.7 and a_p the activity indices defined in clause 6 and corresponding values for IG12 and Rz12 shall be used.

NOTE Information on the accuracy of the IRI-2007 model and typical ionospheric density profiles are given in Annex H.3.1