On the assimilation of vTEC measurements collected by a GNSS receiver network in the International Reference Ionosphere model.

Pignalberi A., Habarulema J.B., Pezzopane M., Rizzi R.

IV - Geofisica e fisica dell'ambiente
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A procedure for updating the International Reference Ionosphere (IRI) model by means of assimilated vertical total electron content (vTEC) measurements from a Global Navigational Satellite Systems (GNSS) receiver network is presented. To assimilate vTEC data in the IRI UPdate (IRI UP) framework, mathematical relationships between F2 layer characteristics and vTEC values are derived using South African co-located ionosondes and GNSS stations. Through data assimilation, ionospheric effective activity indices are calculated whose ingestion in the IRI model allows for an updated description of the ionosphere. The goodness of the IRI UP method is verified for both quiet and disturbed days.

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