Ionospheric nowcasting via assimilation of GPS measurements of ionospheric electron content in a global physics-based time-dependent model

Autor: B. Cruickshank, Tim Fuller-Rowell, Valery Yudin, J. Sheffel, John M. Retterer, M. Murphy, J. Adams, Boris Khattatov, M. Gnedin
Rok vydání: 2005
Předmět:
Zdroj: Quarterly Journal of the Royal Meteorological Society. 131:3543-3559
ISSN: 1477-870X
0035-9009
DOI: 10.1256/qj.05.96
Popis: We present the rationale for having accurate nowcast and forecast ionospheric conditions, and a brief overview of recent work on assimilation of ionospheric measurements in physics-based models. This manuscript describes the results of a project aimed at generating accurate operational specifications of ionospheric electron content by the assimilation of Global Positioning System (GPS) ionospheric measurements in a relatively complex first-principles forecast model. We describe: the overall design of the model, the implemented sequential data assimilation scheme, the specifics of GPS data processing, and the on-line scheme for estimation of instrumental biases inherent in GPS measurements of ionospheric electron content. Performance of the designed ionospheric specification system is illustrated via common statistical tests, comparisons with data withheld from the assimilation process and comparisons with independent non-GPS measurements. Web-based access to the system results is provided athttp://fusionnumerics.com/ionosphere. Copyright © 2005 Royal Meteorological Society
Databáze: OpenAIRE
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