Evaluation and prospects for storm-time corrections in the International Reference Ionosphere

Autor: Eduardo A. Araujo-Pradere, Tim Fuller-Rowell, Mihail Codrescu, Adela Anghel
Rok vydání: 2004
Předmět:
Zdroj: Advances in Space Research. 33:902-909
ISSN: 0273-1177
Popis: IRI2000 [Radio Sci. 36 (2) (2001) 261] now contains a geomagnetic activity dependence based on an empirical storm-time ionospheric correction model STORM [Geof. Int. 39 (1) (2000) 29; Radio Sci. 37 (5) (2002) 1070] The storm correction is driven by the previous time-history of ap, and is designed to scale the quiet-time F-layer critical frequency (foF2) to account for storm-time changes in the ionosphere. The quality of the storm-time correction has been evaluated by comparing the model with the observed ionospheric response during all the significant geomagnetic storms in 2000 and 2001. The model output was compared with the actual ionospheric response at 15 stations for each storm. The comparisons show the model captures the decreases in electron density particularly well in summer and equinox conditions, but has less quality during winter conditions. The value of the model has been quantified by comparing the data with the IRI2000 model, which contains the storm correction, and with IRI95, which has no geomagnetic activity dependence. The results of this study illustrate that the root mean square error (RMSE) with IRI2000 has a 28% improvement over IRI95 during the storm days, a significant improvement. A similar model for TEC is currently being developed based on data from ground-based dual frequency GPS observations. During the Bastille Day storm the GPS data over Florida showed dramatic changes. Data such this will be used to develop an empirical storm-time TEC correction model adopting a similar approach, as was done for the F-region model.
Databáze: OpenAIRE
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