How well reflects IRI the electron density during the recent solar minimum? Comparison with CHAMP and GRACE (Invited)

Details How well reflects IRI the electron density during the recent solar minimum? Comparison with CHAMP and GRACE (Invited) How well reflects IRI the electron density during the recent solar minimum? Comparison with CHAMP and GRACE (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa42a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA42A-01

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2447] Ionosphere / Modeling And Forecasting, [2481] Ionosphere / Topside Ionosphere

Scientific paper

There have been indications that empirical models show difficulties to reflect the environmental conditions properly during this recent deep solar minimum. We have tested the reliability of electron density predictions from the latest IRI-07 version by comparison with CHAMP and GRACE observations. The whole data series from 2000 to 2010 was utilized. Orbital averages of electron density readings at the two altitudes 480km (GRACE) and 450-300km (CHAMP) are compared with collocated predictions from IRI. When considering monthly averages the model values track the observations reasonably well during solar maximum years. From 2005 onward the model progressively overestimates the electron density at both altitudes. By the end of 2009 the model is too high by a factor of 2. For investigating the global structure of the discrepancy we have plotted the latitudinal/local time distribution of the modelled and observed electron density. It becomes clear that the difference can be traced back to a significant overestimate of the equatorial ionization anomaly (EIA) by the model. As an explanation we suggest that the controlling parameters F10.7 and Ap are no longer sufficient for describing the processes during this deep minimum.

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