Evaluation of global modeling of M(3000)F2 and hmF2 based on alternative empirical orthogonal function expansions

Details Evaluation of global modeling of M(3000)F2 and hmF2 based on alternative empirical orthogonal function expansions Evaluation of global modeling of M(3000)F2 and hmF2 based on alternative empirical orthogonal function expansions

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010adspr..46.1024z&link_type=abstract

Advances in Space Research, Volume 46, Issue 8, p. 1024-1031.

Computer Science

1

Scientific paper

Global modeling of M(3000)F2 and hmF2 based on three alternative EOF (empirical orthogonal function) expansion methods is described briefly. Data used for the model construction is the monthly median hourly values of M(3000)F2 from the ionosonde/digisonde stations distributed around the world for the period of 1975-1985 and the hmF2 data of the same period converted from the measured M(3000)F2 based on the strong anti-correlation existing between them. Independent data of a low (1965) and a high (1970) solar activity year are used to validate the three alternative models based on different EOF expansion methods. Comparisons between the modeled results and observed data for both the low (1965) and high (1970) solar activity years showed good agreement for both M(3000)F2 and hmF2 parameters. Statistical analysis on the differences between model values and observed data showed that all the three alternative models (Model A, B and C) based on the different EOF expansion methods have better agreement with the observed data than the models currently used in IRI. All three alternative EOF based models have almost the same accuracy. Discussion on the preference of the three alternative EOF based models is given.

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