Session C4.1: Improving the Description of Hemispheric Differences in Ionospheric
Models
Hemispheric differences have been observed for many ionospheric parameters including, the seasonal variation of electron and ion densities and temperatures. For example, the well-known Winter Anomaly exhibits a much stronger amplitude in the Northern hemisphere while the semiannual anomaly is stronger in the Southern hemisphere, and the Northern hemisphere counterpart to the Weddell Sea anomaly in the Southern Hemisphere is much weaker. We invite presentations that investigate how well models describe the structure of these hemispheric differences with special emphasis on the IRI model, which is the ISO standard for the ionosphere. Because empirical models may have an inherent bias due to differences in data coverage, it is important to verify that models like IRI correctly represent hemispheric asymmetries well. Talks covering all aspects of the IRI modeling effort including model improvements, comparisons with new data, IRI extensions, and IRI applications are encouraged. Presentations that investigate the causes of hemispheric asymmetries are particularly welcome.
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