Instantaneous Regional Ionosphere Modeling

P. Wielgosz, D. Grejner-Brzezinska, I. Kashani, Y. Yi

Abstract:	This paper demonstrates the concept and practical examples of instantaneous mapping of regional ionosphere, based on GPS observations from the State of Ohio continuously operated reference stations (CORS) network. Instantaneous ionosphere mapping is defined as a technique applying simultaneously measured total electron content (TEC) values at a limited number of locations to generate TEC maps referred to a specific time epoch (Stanislawska et al., 2000). Interpolation/prediction techniques, such as Kriging (KR) and the Multiquadratic Model (MQ,) which are suitable for handling multi-scale phenomena and unevenly distributed data were used to create the TEC maps. Their computational efficiency (especially MQ technique) and the ability to handle undersampled data (especially Kriging) are particularly attractive. The quality of the ionosphere representation was tested by comparison to the reference International GPS Service (IGS) Global Ionosphere Maps (GIMs). Dual frequency carrier phase and code GPS observations collected by a relatively dense Ohio CORS network (~ 100 km station separation distance and 1-second sampling rate) were used in this study. Presented here are the preliminary results based on GPS observations collected at 5 Ohio CORS stations. A zero-difference approach was used for the absolute TEC recovery. To assess the capability of the data to detect the local ionospheric features, TEC maps with high spatial resolution were obtained. Sample period of geomagnetically active conditions was selected for demonstration purposes.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1750 - 1757
Cite this article:	Wielgosz, P., Grejner-Brzezinska, D., Kashani, I., Yi, Y., "Instantaneous Regional Ionosphere Modeling," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1750-1757.
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